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united states history

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Firemen's muster. Boothbay center, Maine. Typical handpump manned by twenty-four men, twelve along each of the handle bars

Firemen's muster. Boothbay center, Maine. Typical handpump manned by t...

Public domain image related to President Abraham Lincoln, gelatin silver print, free to use, no copyright restrictions image - Picryl description

Eugene Davis, gold prospector, operating "rocker". Rocks and sticks remain in the screened box at the top when water is sluiced over them and the contraption is rocked by the handle. Loose dirt and any mineral content washes below, the dirt gradually washing through and the heavy gold and minerals settling to the bottom and behind the ridges. Pinos Altos, New Mexico

Eugene Davis, gold prospector, operating "rocker". Rocks and sticks re...

Picryl description: Public domain image of a quarry, mine, excavation, or mining site, free to use, no copyright restrictions.

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

A black and white photo of a man working in a quarry. Great Depression Era, New Mexico

A black and white photo of a man working in a quarry. Great Depression...

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.

A black and white photo of a man sitting on a train track. Great Depression FFSA / OWI Negatives

A black and white photo of a man sitting on a train track. Great Depre...

Picryl description: Public domain image of a mine, mining, free to use, no copyright restrictions.

Pittsburgh, Pennsylvania. (vicinity) Montour no. 4 mine of the Pittsburgh Coal Company. Testing for bad ceiling by sounding with the handle of a pick. If the slate is loose, it is pulled down till the ceiling becomes solid, or if it is very rotten, it is timbered

Pittsburgh, Pennsylvania. (vicinity) Montour no. 4 mine of the Pittsbu...

Picryl description: Public domain image of a coal mine, mining, free to use, no copyright restrictions.