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A black and white photo of a man working in a factory, West Virginia. Farm Security Administration photograph.

A black and white photo of a man working in a factory, West Virginia. ...

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

A black and white photo of people working in a factory, West Virginia. Farm Security Administration photograph.

A black and white photo of people working in a factory, West Virginia....

Public domain photograph - United States during the 1930s and 1940s, Farm Security Administration, New Deal, free to use, no copyright restrictions image - Picryl description

Salinas, California. Intercontinental Rubber Producers. Gathering guayule seed with a vacuum machine

Salinas, California. Intercontinental Rubber Producers. Gathering guay...

Picryl description: Public domain photograph of farming, farmer, agriculture, 20th-century, free to use, no copyright restrictions.

Rahr Malting Co., Manitowoc, Wisconsin. Third floor, vacuum dryers I

Rahr Malting Co., Manitowoc, Wisconsin. Third floor, vacuum dryers I

Public domain photograph of 1940s-1950s America, free to use, no copyright restrictions image - Picryl description

First radio vacuum tube. Carl W. Mitman, Curator of Engineering, US Nat'l Museum, holding what is believed to be the 1st radio tube. It was made in 1898 by D. Mefarlan Moore of NY. Radio waves emanating from this tube ignited a bomb a city block away and blew up a miniature of the Battleship Maine

First radio vacuum tube. Carl W. Mitman, Curator of Engineering, US Na...

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

New quick drying defense huts demonstrated to government officials. Washington, D.C., Aug. 25. By means of a new invention known as the vacuum concrete process, a pill box fort was erected on the grounds of the National Bureau of Standards today in the record time of four hours. The purpose of the demonstration was to show a new and more efficient method of construction for defense purposes under emergencies. K.P. billner (right) inventor of the process, is pictured explaining it to Dr. Lyman Briggs, ([...])Director of the Bureau of Standards, and [..] Monroe Johnson, Assistant Secretary of Commerce

New quick drying defense huts demonstrated to government officials. Wa...

A group of men standing next to each other. Public domain portrait photograph, free to use, no copyright restrictions image - Picryl description

Quaker State Refining Company, Oil City, Pennsylvania. These are the solution and vacuum towers of the Quaker State refinery at Oil City, Pennsylvania. This refinery is working at full capacity to assure our military forces of ample supplies of the high-grade lubricants needed to operate ships, guns, tanks, and planes

Quaker State Refining Company, Oil City, Pennsylvania. These are the s...

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

Electric Institute of Washington. Stage and vacuum cleaner display

Electric Institute of Washington. Stage and vacuum cleaner display

Public domain photograph of commerce and advertising, 1920s-1930s America, free to use, no copyright restrictions image - Picryl description

Knox County, Tennessee (Tennessee Valley Authority (TVA)). Mrs. Wiegel uses electric vacuum cleaner

Knox County, Tennessee (Tennessee Valley Authority (TVA)). Mrs. Wiegel...

Picryl description: Public domain photograph of the 1930s - 1940s, woman, female portrait, United States, free to use, no copyright restrictions.

[Man pointing to glass globe during experiment demonstrating the force of air pressure on a vacuum]

[Man pointing to glass globe during experiment demonstrating the force...

Illus. in: Ottonis de Guericke Experimenta nova (ut vocantur) magdeburgica de vacuo spatio primùm à R.P. Gaspare Schotto ... nunc verò ab ipso auctore perfectiùs edita, variisque aliis experimentis aucta. Amst... More

Dr. Waksmundzka, 1200 16th St., Apt. 414. Vacuum cup treatment VIII

Dr. Waksmundzka, 1200 16th St., Apt. 414. Vacuum cup treatment VIII

Picryl description: Public domain image of a woman, nurse, caring, hospital, free to use, no copyright restrictions.

Electric Institute of Washington. Window display of vacuum cleaners II

Electric Institute of Washington. Window display of vacuum cleaners II

Public domain photograph of commerce and advertising, 1920s-1930s America, free to use, no copyright restrictions image - Picryl description

Removing impurities from polished rice before polishing. Vacuum tubes are used in this process. Abbeville, Louisiana

Removing impurities from polished rice before polishing. Vacuum tubes ...

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

Women in industry. Gas mask production. The finished gas mask face pieces in the foreground were just flaps of rubber without eye pieces, outlet valves, straps, tabs, and other accessories when they started on the long moving belt at the far end of the line. By the time they've reached this end, however, a hundred pairs of hands have worked on them, machining, clamping, riveting, testing, and inspecting each one until the completed masks are packaged in the final stages of production. All this activity takes place in a Midwest vacuum cleaner plant which has been converted to war work. Eureka Vacuum, Detroit, Michigan

Women in industry. Gas mask production. The finished gas mask face pie...

Picryl description: Public domain image of a woman working, women labor, 1940s, economic conditions, home front, world war two, free to use, no copyright restrictions.

The motors of many refrigerators require periodic cleaning. If your model is one of these, keep coils free from hampering dust and grime by weekly sessions with a wire brush or a vacuum attachment

The motors of many refrigerators require periodic cleaning. If your mo...

Public domain photograph related to music, performing arts, free to use, no copyright restrictions image - Picryl description

[Air pump and glass receptacle demonstrating that a small animal will die in a vacuum]

[Air pump and glass receptacle demonstrating that a small animal will ...

Illus. in: A continuation of New experiments, physico-mechanical, touching the spring and weight of the air, and their effects ... / By the Honourable Robert Boyle. Oxford : Printed by H. Hall, for R. Davis, 1... More

A black and white photo of a man working on a machine, West Virginia. Farm Security Administration photograph.

A black and white photo of a man working on a machine, West Virginia. ...

Picryl description: Public domain image of industrial or agricultural worker, 1930s, 20th-century, free to use, no copyright restrictions. show less

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