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One of the lenses for the new camera at Dept. of Commerce

One of the lenses for the new camera at Dept. of Commerce

Public domain photograph, 1910s-1920s portrait, American, free to use, no copyright restrictions image - Picryl description

Norris Dam and powerhouse. Elevator penthouse atop dam which also serves as flagpole base. Elevator serves various levels of operating machinery inside dam. Top of dam is developed as roadway with sidewalks. Note handrail projecting toward sidewalk and toe space in parapet to make enjoyment of view more comfortable. Handrail brackets are hollow and contain lights which illuminate the roadway but avoid glare by the use of reflectors and directional lenses

Norris Dam and powerhouse. Elevator penthouse atop dam which also serv...

Picryl description: Public domain image of a modernist architecture building, 20th century, free to use, no copyright restrictions.

Norris Dam and powerhouse. Night view of Norris Dam with floodlighting. The more spectacular dams of the TVA (Tennessee Valley Authority) are equipped to be floodlit at night and are popular excursion points. Pinpoint lights along top of dam are small lenses in back of the handrail bracket road lighting fixtures. Wet spots on dam are the result of small shrinkage cracks during initial years which later sealed themselves by the sediment contained in the water

Norris Dam and powerhouse. Night view of Norris Dam with floodlighting...

Public domain photograph of indoor, interior activity, America in the 1930s, free to use, no copyright restrictions image - Picryl description

Wheeler dam and powerhouse. Visitors' reception room in Wheeler control building. Windows on three sides and overlook terrace adjoining offer complete view of plant and surroundings. Fourth wall used for description of TVA (Tennessee Valley Authority) program. Floor: gray-brown terrazo, divided into large squares by white metal strips. Wainscot, window sills, trim around doorway and curb at footlights brownish-red precast terrazo. Walls burlap covered, painted subdued tan. Windows aluminum. Ceiling and upper part of walls, plaster painted warm gray with warm off-white reflecting circles and cove across end (ceiling acoustic plaster). Lighting indirect. Lights in cove across end of room also throw downward, directed by lenses toward wall display and shielded by aluminum louvers. Behind curb inclined contol lens footlights and louver (aluminum) shielding air exhaust. Supply through ceiling grilles which border ceiling on two sides. Deep trim around doorway intended as shield while passing footlights. Display in gray, black and tan, keyed with general color scheme. Guard's desk of natural oak and ebomized birch, with raised ledge for visitor's registration

Wheeler dam and powerhouse. Visitors' reception room in Wheeler contro...

Picryl description: Public domain image of a living room, salon, office, late 19th-century interior, free to use, no copyright restrictions.

Testing airplanes lenses used in map making. Washington, D.C., May 6. Dr. F.E. Washer of the U.S. Bureau of Standards testing the lens for the airplane cameras that are used by the Army and Navy. There are lights in the rear of the columnmeters and exposures are made on the photographic plate in front of the doctor. The lens are tested for distortion, focal length, and definition. This work must be very exacting as a small error would make an error of many miles on the maps made by the aerial cameras, 5/6/1937

Testing airplanes lenses used in map making. Washington, D.C., May 6. ...

Public domain photograph of people in office, interior, the 1910s-1920s America, free to use, no copyright restrictions image - Picryl description

[Unidentified man, full-length portrait, wearing spectacles with colored lenses, standing next to column, facing left]

[Unidentified man, full-length portrait, wearing spectacles with color...

On verso: E.M. Recher, Photographic Artist, Hagerstown, Md. In album: [U.S. army officers and other persons of the Civil War period / John White Geary, comp. 1861-1865], no. 123, surrogate p. 31 (lower left). S... More

Subcontracting. Passaic home workshop pool. Jack Vida, of Passaic, New Jersey, shows his little daughter a reamer bushing he just completed in his home workshop, which is part of a subcontract pool organized by the Howe Machinery Company of Passaic. He also grinds precision lenses for military use

Subcontracting. Passaic home workshop pool. Jack Vida, of Passaic, New...

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

Subcontracting. Passaic home workshop pool. The home of Jack Vida, Passaic, New Jersey. In the basement of this home, Mr. Vida operates a workshop handling part of the production turned out by a subcontract pool organized by the Howe Machinery Company of Passaic. In addition to this work, he follows his regular trade of grinding precision lenses for military use

Subcontracting. Passaic home workshop pool. The home of Jack Vida, Pas...

Public domain photograph of a historic place in New Jersey, no copyright restrictions image - Picryl description

Norris Dam and powerhouse. Night view of Norris Dam with floodlighting. The more spectacular dams of the TVA (Tennessee Valley Authority) are equipped to be floodlit at night and are popular excursion points. Pinpoint lights along top of dam are small lenses in back of the handrail bracket road lighting fixtures. Wet spots on dam are the result of small shrinkage cracks during initial years which later sealed themselves by the sediment contained in the water

Norris Dam and powerhouse. Night view of Norris Dam with floodlighting...

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

Subcontracting. Passaic home workshop pool. Jack Vida, of Passaic, New Jersey, inspects precision lenses he ground for military use in his home workshop. In addition to this work, Mr. Vida employs four men to turn out machine tools for aircraft production as a member of a subcontract pool organized by the Howe Machinery Company of Passaic

Subcontracting. Passaic home workshop pool. Jack Vida, of Passaic, New...

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

Norris Dam and powerhouse. Elevator penthouse atop dam which also serves as flagpole base. Elevator serves various levels of operating machinery inside dam. Top of dam is developed as roadway with sidewalks. Note handrail projecting toward sidewalk and toe space in parapet to make enjoyment of view more comfortable. Handrail brackets are hollow and contain lights which illuminate the roadway but avoid glare by the use of reflectors and directional lenses

Norris Dam and powerhouse. Elevator penthouse atop dam which also serv...

Picryl description: Public domain photo of a factory, warehouse, commercial or industrial building, free to use, no copyright restrictions image.

Making eyes for the army. Polishing lenses by hand in the optical department of an Army arsenal, where thousands of sights for guns are being turned out

Making eyes for the army. Polishing lenses by hand in the optical depa...

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