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Indiana Harbor Belt RR, switchman demonstrating signal with a "fusee" - used at twilight and dawn - when visibility is poor. This signal means "back up." Calumet City, Ill.

Indiana Harbor Belt RR, switchman demonstrating signal with a "fusee" ...

Public domain photograph - historical image of Illinois, United States, free to use, no copyright restrictions image - Picryl description

Conservation. Glass gauges replacing steel. Checking an inside diameter of a cartridge case with one of the glass gauges which replace steel gauges at the Frankford Arsenal. Glass gauges are lighter and cheaper than steel, permit greater visibility in inspection, are not as much affected by room temperatures and heat of operators' hands, are not corroded by perspiration, need no protection against rusting, do not acquire burrs that would change the effective sizes. They can save the annual use of 250 tons of critical tool steel in government arsenals alone

Conservation. Glass gauges replacing steel. Checking an inside diamete...

Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description

New York, New York. Composing room of the New York Times newspaper. Paper mat is made in "rock crusher" and inked for visibility

New York, New York. Composing room of the New York Times newspaper. Pa...

Public domain photograph - New York, United States, free to use, no copyright restrictions image - Picryl description

Conservation. Glass gauges replacing steel. Inspecting a gear with a steel ring, since replaced by a glass gauge at the Frankford Arsenal. Glass gauges are lighter and cheaper than steel, permit greater visibility in inspection, are not as much affected by room temperatures and heat of operators' hands, are not corroded by perspiration, need no protection against rusting, do not acquire burrs that would change the effective sizes. They can save the annual use of 250 tons of critical tool steel in government arsenals alone

Conservation. Glass gauges replacing steel. Inspecting a gear with a ...

Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description

Conservation. Glass gauges replacing steel. Brigadier General H.F. Safford, Chief of Production Service Branch, Ordnance Department, examines an exhibit of standard types of new glass gauges which replace steel gauges at the Frankford Arsenal. Glass gauges are lighter and cheaper than steel, permit greater visibility in inspection, are not as much affected by room temperatures and heat of operators' hands, are not corroded by perspiration, need no protection against rusting, do not acquire burrs that would change the effective sizes. They can save the annual use of 250 tons of critical tool steel in government arsenals alone

Conservation. Glass gauges replacing steel. Brigadier General H.F. Saf...

Public domain photograph of the 1930s-1940s World War Two, armed forces, military production, no copyright restrictions image - Picryl description

Conservation. Glass gauges replacing steel. Markings are carried on a label pasted on the handle of a glass plug gauge, which replace steel gauges at the Frankford Arsenal. Markings on other gauges are produced by acid etching. Glass gauges are lighter and cheaper than steel, permit greater visibility in inspection, are not as much affected by room temperatures and heat of operators' hands, are not corroded by perspiration, need no protection against rusting, do not acquire burrs that would change the effective sizes. They can save the annual use of 250 tons of critical tool steel in government arsenals alone

Conservation. Glass gauges replacing steel. Markings are carried on a ...

Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description

Conservation. Glass gauges replacing steel. A steel plug gauge is compared with a glass plug gauge which replaces it at the Frankford Arsenal. A plain ring glass gauge shows in the foreground. Glass gauges are lighter and cheaper than steel, permit greatly visibility in inspection, are not as much affected by room temperatures and heat of operators' hands, are not corroded by perspiration, need no protection against rusting, do not acquire burrs that would change the effective sizes. They can save the annual use of 250 tons of critical tool steel in government arsenals alone

Conservation. Glass gauges replacing steel. A steel plug gauge is comp...

Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description

Conservation. Glass gauges replacing steel. A glass ring gauge for the inspection of fuse parts. These gauges are replacing steel gauges at the Frankford Arsenal. Glass gauges are lighter and cheaper than steel, permit greater visibility in inspection, are not as much affected by room temperatures and heat of operators' hands, are not corroded by perspiration, need no protection against rusting, do not acquire burrs that would change the effective sizes. They can save the annual use of 250 tons of critical tool steel in government arsenals alone

Conservation. Glass gauges replacing steel. A glass ring gauge for the...

Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description

Civilian protection. These auxiliary firemen will play an important part in our civilian defense in the event of air raids on American cities. Here they are going out on a practice "emergency call." The truck is a regular fire department hose wagon, painted battleship gray to reduce visibility and equipped with blackout headlights. The Maltese crosses on the men's armbands is the insignia of the auxiliary fire forces

Civilian protection. These auxiliary firemen will play an important pa...

Public domain photograph of an automobile, 1920s car, free to use, no copyright restrictions image - Picryl description

Conservation. Glass gauges replacing steel. Checking an inside diameter of a cartridge case with one of the glass gauges, which replace steel gauges at the Frankford Arsenal, are produced by acid etching. Glass gauges are lighter and cheaper than steel, permit greater visibility in inspection, are not as much affected by room temperatures and heat of operators' hands, are not corroded by perspiration, need no protection against rusting, do not acquire burrs that would change the effective sizes. They can save the annual use of 250 tons of critical tool steel in government arsenals alone

Conservation. Glass gauges replacing steel. Checking an inside diamete...

Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description

Visibility zero unless you lend your binoculars to the navy 6 x 30 or 7 x 50 Zeiss or Bausch and Lomb : Pack carefully and send to Navy Observatory, Washington, D.C.

Visibility zero unless you lend your binoculars to the navy 6 x 30 or ...

Poster asking citizens to lend their binoculars to the Navy, showing a ship hit by a torpedo. Work Projects Administration Poster Collection (Library of Congress).

Conservation. Glass gauges replacing steel. Mr. A.E. Smith and Mr. Stanley Farrow (left to right) of Army Ordnance's Gage Section, discuss glass gauges, which replace steel gauges at the Frankford Arsenal. Glass gauges are lighter and cheaper than steel, permit greater visibility in inspection, are not as much affected by room temperatures and heat of operators' hands, are not corroded by perspiration, need no protection against rusting, do not acquire burrs that would change the effective sizes. They can save the annual use of 250 tons of critical tool steel in Government arsenals alone

Conservation. Glass gauges replacing steel. Mr. A.E. Smith and Mr. Sta...

Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description

Conservation. Glass gauges replacing steel. Markings on the handles of new glass gauges, which replace steel gauges at the Frankford Arsenal, are produced by acid etching. Glass gauges are lighter and cheaper than steel, permit greater visibility in inspection, are not as much affected by room temperatures and heat of operators' hands, are not corroded by perspiration, need no protection against rusting, do not acquire burrs that would change the effective sizes. They can save the annual of 250 tons of critical tool steel in government arsenals alone

Conservation. Glass gauges replacing steel. Markings on the handles of...

Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Indiana Harbor Belt RR, switchman demonstrating signalwith a "fusee"- used at twilight and dawn - when visibility is poor. This signal means "go ahead." Calumet City, Ill.

Indiana Harbor Belt RR, switchman demonstrating signalwith a "fusee"- ...

Public domain photograph - historical image of Illinois, United States, free to use, no copyright restrictions image - Picryl description

Famous transatlantic flyer demonstrates new type plane to Navy Officials. Clarence Chamberlain, famous Transatlantic flyer, and Ruth Nichols (in cabin) noted aviator, arrived in Washington today with the new Chamberlain cabin menoplane. In this photograph they are pointing out the many features of this new plane to Commander A.H. Douglas, Commandant of the Naval Air Station and Commander J.H. Towers, Assistant Chief of the Naval Bureau of Aeronautics (right). Unusual visibility and special aerlons which Chamberlain says practically makes it impossible for this ship to stall or go into a tailspin, are the new features

Famous transatlantic flyer demonstrates new type plane to Navy Officia...

Picryl description: Public domain image of an aircraft, aviator, 20th-century aviation, free to use, no copyright restrictions.

Conservation. Glass gauges replacing steel. Brigadier General H.F. Safford, Chief of theProduction Service Branch, Ordnance Department, examines an exhibit of standard types of new glass gauges which replace steel gauges at the Frankford Arsenal. Glass gauges are lighter and cheaper than steel, permit greater visibility in inspection, are not as much affected by room temperatures and heat of operators' hands, are not corroded by perspiration, need no protection against rusting, do not acquire burrs that would change the effective sizes. They can save the annual use of 250 tons of critical tool steel in government arsenals alone

Conservation. Glass gauges replacing steel. Brigadier General H.F. Saf...

Public domain photograph of the 1930s-1940s World War Two, armed forces, military production, no copyright restrictions image - Picryl description

Conservation. Glass gauges replacing steel. Checking an inside diameter of a cartridge case with one of the glass gauges which replace steel gauges at the Frankford Arsenal. Glass gauges are lighter and cheaper than steel, permit greater visibility in inspection, are not as much affected by room temperatures and heat of operators' hands, are not corroded by perspiration, need no protection against rusting, do not acquire burrs that would change the effective sizes. They can save the annual use of 250 tons of critical tool steel in government arsenals alone

Conservation. Glass gauges replacing steel. Checking an inside diamete...

Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description

Conservation. Glass gauges replacing steel. A steel plug gauge, since replaced by a glass gauge at the Frankford Arsenal, is shown checking an inside diameter of a cartridge case. Glass gauges are lighter and cheaper than steel, permit greater visibility in inspection, are not as much affected by room temperatures and heat of operators' hands, are not corroded by perspiration, need no protection against rusting, do not acquire burrs that would change the effective sizes. They can save the annual use of 250 tons of critical tool steel in government arsenals alone

Conservation. Glass gauges replacing steel. A steel plug gauge, since ...

Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description

Conservation. Glass gauges replacing steel. Checking an inside diameter of a cartridge case with one of the glass gauges, which replace steel gauges at the Frankford Arsenal, are produced by acid etching. Glass gauges are lighter and cheaper than steel, permit greater visibility in inspection, are not as much affected by room temperatures and heat of operators' hands, are not corroded by perspiration, need no protection against rusting, do not acquire burrs that would change the effective sizes. They can save the annual use of 250 tons of critical tool steel in government arsenals alone

Conservation. Glass gauges replacing steel. Checking an inside diamete...

Picryl description: Public domain image of a worker, labor, factory, plant, manufacture, industrial facility, 1930s, mid-20th-century industrial photo, free to use, no copyright restrictions.

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Conservation. Glass gauges replacing steel. Checking the inside diameter of a cartridge case with one of the glass gauges, which are replacing steel gauges at the Frankford Arsenal. Glass gauges are lighter and cheaper than steel, permit greater visibility in inspection, are not as much affected by room temperatures and heat of operators' hands, are not corroded by perspiration, need no protection against rusting, do not acquire burrs that would change the effective sizes. They can save the annual use of 250 tons of critical tool steel in government arsenals alone

Conservation. Glass gauges replacing steel. Checking the inside diamet...

Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description

Conservation. Glass gauges replacing steel. A plain plug glass gauge, which replaces a steel gauge in the Frankford Arsenal, is used to determine the inside diameter of a metal part. Glass gauges are lighter and cheaper than steel, permit greater visibility in inspection, are not as much affected by room temperatures and heat of operators' hands, are not corroded by perspiration, need no protection against rusting, do not acquire burrs that would change the effective sizes. They can save the annual use of 250 tons of critical tool steel in government arsenals alone

Conservation. Glass gauges replacing steel. A plain plug glass gauge, ...

Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Conservation. Glass gauges replacing steel. Glass gauges of various types are replacing steel gauges at the Frankford Arsenal. Left, top to bottom: double-end gauge, "go" plug gauge, ring gauge. Right, top to bottom: "not go" plug gauge, double and solid-handle plug gauge, double-end taper-lock standard, handle plug gauge. Glass gauges are lighter and cheaper than steel, permit greater visibility in inspection, are not as much affected by room temperatures and heat of operators' hands, are not corroded by perspiration, need no protection against rusting, do not acquire burrs that would change the effective sizes. They can save the annual use of 250 tons of critical tool steel in government arsenals alone

Conservation. Glass gauges replacing steel. Glass gauges of various ty...

Public domain photograph of laboratory, scientist, free to use, no copyright restrictions image - Picryl description

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

Visibility studies and some applications in the field of camouflage

Visibility studies and some applications in the field of camouflage

Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Col... More

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