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A table embracing all the elementary combinations of numbers in addition ... Boston Brewer & Tileston [c. 1864].

A table embracing all the elementary combinations of numbers in additi...

On verso: 1022. Available also through the Library of Congress web site in two forms: as facsimile page images and as full text in SGML. Printed Ephemera Collection; Portfolio 71, Folder 20a.

Production. A-20 attack bombers. Women workers at the Long Beach, California plant of Douglas Aviation Company groom lines of transparent noses for deadly A-20 attack bombers. The A-20 is used by the American Air Force and RAF (Royal Air Force) for hedge hopping and strafing operations against ground troops and installations; also for reconnaissance work and night fighting. It is armed with light and heavy caliber guns in varying combinations

Production. A-20 attack bombers. Women workers at the Long Beach, Cali...

Picryl description: Public domain image of a bomber aircraft, military aviation, air forces, free to use, no copyright restrictions.

Washington public schools go to war. The public schools of Washington, D.C., like those in most other sections of the country, have revised their curricula to fit the pupils for fuller participation in the war effort. They have gone all-out for the Program of Civilian Defense which inludes conserving of materials and wearing apparel. Members of the art and crafts class at Armstrong High School have made jewelry and many other articles from scrap and discarded materials. Girls are taught to wear proper color combinations and the right kind of accessories for each dress. Photo shows (left to right): Misses Helen G. Weaver, Yvonne Colvin and Audrey V. Minor in an exhibit of the art and crafts class

Washington public schools go to war. The public schools of Washington,...

Picryl description: Public domain historical photo of Washington DC during the First World War, free to use, no copyright restrictions image.

Production. A-20 attack bombers. Fuselages of A-20 attack bombers await entry to the assembly lines at the Long Beach, California plant of Douglas Avaiation Company, where they will receive tails, wings and power plants. The A-20 is used by the American Air Force and Royal Air Force for hedge hopping and strafing operations against ground troops and installation; also for reconnaissance work and night fighting. It is armed with light and heavy caliber guns in varying combinations

Production. A-20 attack bombers. Fuselages of A-20 attack bombers awai...

Picryl description: Public domain image of a bomber aircraft, military aviation, air forces, free to use, no copyright restrictions.

Planes in flight. The P-40 single-engine fighter plane--which the British have used in its various models as the "Tomahawk," "Kittyhawk" and "Warhawk"--is a fast pursuit ship in the 400-mile-per-hour class. It has an approximate service ceiling of 30,000 feet and a range of about 900 miles. Carrying various combinations of light and heavy caliber guns, it has performed notably with the RAF (Royal Air Force) in England and Africa, with the AVG (American Volunteer Group--Flying Tigers) in China and. with the AAF (Army Air Forces) in the South Pacific

Planes in flight. The P-40 single-engine fighter plane--which the Brit...

Picryl description: Public domain historical photo of Second World War, free to use, no copyright restrictions image.

Production. Airplane propellers. Finished propeller blades ready for assembly at a Hartford, Connecticut, plant. These blades will later be mounted in combinations of two, three and four in hydromatic mechanisms that permit adjustments of blade pitch while planes are in action

Production. Airplane propellers. Finished propeller blades ready for a...

Public domain photograph of manufacturing, industry, free to use, no copyright restrictions image - Picryl description

Douglas military aircraft Army. The Douglas A-20 (Havoc) light bomber, called the Boston by the British, is used by both the American Air Force and the Royal Air Force. It was designed as an attack bomber for hedge hopping and strafing operations against ground troops and installations. Because of the speed and performance abilities of this plane, the British have converted a number for use as night fighters. Some have also been used for reconnissance work. Armament details vary according to use, light and heavy guns being mounted in varying combinations

Douglas military aircraft Army. The Douglas A-20 (Havoc) light bomber,...

Picryl description: Public domain image of a bomber aircraft, military aviation, air forces, free to use, no copyright restrictions.

Douglas military aircraft Army. The Douglas A-20 (Havoc) light bomber, called the Boston by the British, is used by both the American Air Force and the Royal Air Force. It was designed as an attack bomber for hedge hopping and strafing operations against ground troops and installations. Because of the speed and performance abilities of this plane, the British have converted a number for use as night fighters. Some have also been used for reconnissance work. Armament details vary according to use, light and heavy guns being mounted in varying combinations

Douglas military aircraft Army. The Douglas A-20 (Havoc) light bomber,...

Picryl description: Public domain image of a bomber aircraft, military aviation, air forces, free to use, no copyright restrictions.

The king of the combinations / J.S. Pughe.

The king of the combinations / J.S. Pughe.

Illustration shows John D. Rockefeller wearing a huge crown and robe, standing on an oil storage tank labeled "Standard Oil", and glaring at the viewer. The crown is adorned with railroad cars, oil tanks, and t... More

Production. A-20 attack bombers. Wings for deadly A-20 attack bombers form interesting patterns at the Long Beach, California plant of the Douglas Aircraft Company. The A-20 is used by the American Air Force and the RAF (Royal Air Force) for hedge hopping and for reconnaissance work and night fighting. It is armed with light and heavy caliber guns in varying combinations

Production. A-20 attack bombers. Wings for deadly A-20 attack bombers ...

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

Planes in flight. The P-40 single-engine fighter plane--which the British have used in its various models as the "Tomahawk," "Kittyhawk" and "Warhawk"--is a fast pursuit ship in the 400-mile-per-hour class. It has an approximate service ceiling of 30,000 feet and a range of about 900 miles. Carrying various combinations of light and heavy caliber guns, it has performed notably with the RAF (Royal Air Force) in England and Africa, with the AVG (American Volunteer Group--Flying Tigers) in China and. with the AAF (Army Air Forces) in the South Pacific

Planes in flight. The P-40 single-engine fighter plane--which the Brit...

Picryl description: Public domain historical photo of Second World War, free to use, no copyright restrictions image.

Production. Airplane propellers. Ed Dimlow, makes a final inspection of a two-blade airplane propeller in the vertical position. The Hartford, Connecticut, plant that produces these blades supplies them to our air forces in combinations with two, three or four blades, and with hydromatic mechanisms that permit adjusting blade pitch while planes are in action

Production. Airplane propellers. Ed Dimlow, makes a final inspection o...

Picryl description: Public domain image of workers, labor, 1940s, economic conditions, free to use, no copyright restrictions.

Douglas military aircraft Army. The Douglas A-20 (Havoc) light bomber, called the Boston by the British, is used by both the American Air Force and the Royal Air Force. It was designed as an attack bomber for hedge hopping and strafing operations against ground troops and installations. Because of the speed and performance abilities of this plane, the British have converted a number for use as night fighters. Some have also been used for reconnaissance work. Armament details vary according to use, light and heavy guns being mounted in varying combinations

Douglas military aircraft Army. The Douglas A-20 (Havoc) light bomber,...

Picryl description: Public domain image of a bomber aircraft, military aviation, air forces, free to use, no copyright restrictions.

Douglas military aircraft Army. The Douglas A-20 (Havoc) light bomber, called the Boston by the British, is used by both the American Air Force and the Royal Air Force. It was designed as an attack bomber for hedge hopping and strafing operations against ground troops and installations. Because of the speed and performance abilities of this plane, the British have converted a number for use as night fighters. Some have also been used for reconnissance work. Armament details vary according to use, light and heavy guns being mounted in varying combinations

Douglas military aircraft Army. The Douglas A-20 (Havoc) light bomber,...

Picryl description: Public domain image of a bomber aircraft, military aviation, air forces, free to use, no copyright restrictions.

Douglas military aircraft Army. The Douglas A-20 (Havoc) light bomber, called the Boston by the British, is used by both the American Air Force and the Royal Air Force. It was designed as an attack bomber for hedge hopping and strafing operations against ground troops and installations. Because of the speed and performance abilities of this plane, the British have converted a number for use as night fighters. Some have also been used for reconnissance work. Armament details vary according to use, light and heavy guns being mounted in varying combinations

Douglas military aircraft Army. The Douglas A-20 (Havoc) light bomber,...

Picryl description: Public domain image of a bomber aircraft, military aviation, air forces, free to use, no copyright restrictions.

Douglas military aircraft Army. The Douglas A-20 (Havoc) light bomber, called the Boston by the British, is used by both the American Air Force and the Royal Air Force. It was designed as an attack bomber for hedge hopping and strafing operations against ground troops and installations. Because of the speed and performance abilities of this plane, the British have converted a number for use as night fighters. Some have also been used for reconnissance work. Armament details vary according to use, light and heavy guns being mounted in varying combinations

Douglas military aircraft Army. The Douglas A-20 (Havoc) light bomber,...

Picryl description: Public domain image of a bomber aircraft, military aviation, air forces, free to use, no copyright restrictions.

A husky upsetter and a forge that was turning out automobile parts a short time ago is one of the many combinations of skilled worker and efficient machine that keep the shells pouring in a steady stream from a converted auto plant. Oldsmobile, Lansing, Michigan

A husky upsetter and a forge that was turning out automobile parts a s...

Picryl description: Public domain image of an industrial building, factory, workshop, workers, 20th century, free to use, no copyright restrictions.

Production. Airplane propellers. Finished propeller blades ready for assembly at a Hartford, Connecticut, plant. These blades will later be mounted in combinations of two, three and four in hydromatic mechanisms that permit adjustments of blade pitch while planes are in action

Production. Airplane propellers. Finished propeller blades ready for a...

Public domain photograph of manufacturing, industry, free to use, no copyright restrictions image - Picryl description

Production. A-20 attack bombers. Long lines of A-20 attack bombers roll ceaslessly, night and day, through the Douglas Aircraft plant at Long Beach, California. The A-20 is used by the American Air Force and the Royal Air Force (RAF) for hedge hopping and strafing operations against ground troops and installations--also for reconnaissance work and night fighting. It is armed for its several duties with light and heavy caliber guns in varying combinations

Production. A-20 attack bombers. Long lines of A-20 attack bombers rol...

Picryl description: Public domain image of a bomber aircraft, military aviation, air forces, free to use, no copyright restrictions.

Production. A-20 attack bombers. Long lines of A-20 attack bombers roll ceaslessly, night and day, through the Douglas Aircraft plant at Long Beach, California. The A-20 is used by the American Air Force and the Royal Air Force (RAF) for hedge hopping and strafing operations against ground troops and installations--also for reconnaissance work and night fighting. It is armed for its several duties with light and heavy caliber guns in varying combinations

Production. A-20 attack bombers. Long lines of A-20 attack bombers rol...

Picryl description: Public domain image of a bomber aircraft, military aviation, air forces, free to use, no copyright restrictions.

Production. Airplane propellers. Frank Geary uses an electro-limit gauge at a Hartford, Connecticut, plant to make final inspections of a three-way hydromatic spider that form part of the mechanism which varies the pitch of airplane propeller blades while planes are in action. At this plant propellers are made with combinations of two, three and four blades

Production. Airplane propellers. Frank Geary uses an electro-limit gau...

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

Douglas military aircraft Army. The Douglas A-20 (Havoc) light bomber, called the Boston by the British, is used by both the American Air Force and the Royal Air Force. It was designed as an attack bomber for hedge hopping and strafing operations against ground troops and installations. Because of the speed and performance abilities of this plane, the British have converted a number for use as night fighters. Some have also been used for reconnissance work. Armament details vary according to use, light and heavy guns being mounted in varying combinations

Douglas military aircraft Army. The Douglas A-20 (Havoc) light bomber,...

Picryl description: Public domain image of a bomber aircraft, military aviation, air forces, free to use, no copyright restrictions.