Victory Gardens--for family and country. Victory Gardeners should lear...
Picryl description: Public domain photograph of farming, farmer, agriculture, 20th-century, free to use, no copyright restrictions.
Rammed earth construction near Birmingham, Alabama. The prepared earth...
Title and other information from caption card. Transfer; United States. Office of War Information. Overseas Picture Division. More information about the FSA/OWI Collection is available at http://hdl.loc.gov/loc... More
A black and white photo of some plants. Office of War Information Phot...
Actual size of negative is D (approximately 3 1/4 x 4 1/4 inches). Caption card lists some of the printing history of image. Title and other information from caption card. Transfer; United States. Office of War... More
West Texas farmer replanting cotton. Had three inches of rain which wa...
Public domain photograph - historical image of Texas, United States, free to use, no copyright restrictions image - Picryl description
Cutting screen door stock to measurement. This material is known as 5/...
Public domain photograph of Louisiana in 1930s, free to use, no copyright restrictions image - Picryl description
![New fathometer used at full speed. Washington, D.C., May 7. Dr. Herbert Grove Dorsey of the U.S. Coast and Geodetic Survey has invented an instrument to secure the precise measurement. The machine sends a sound, pitched so high that it is above audibility, traveling thru the water a known speed, the sound hits the bottom and returns as an echo at 20 times per second. The fathometer is so accurate that a change in depth of three inches can be detected. the indications are made by a flash from a neon tube, viewed thru a rotating disc, the flash of light appearing to stand still and the depth is read as easily as a clock. The instrument indicator is installed in the pilot house (at the top of the machine) and the transceiver (the disc at the right of the machine [?]) is located in the hull of the ship, 5/7/1937](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzE5MzcvMDEvMDEvbmV3LWZhdGhvbWV0ZXItdXNlZC1hdC1mdWxsLXNwZWVkLXdhc2hpbmd0b24tZGMtbWF5LTctZHItaGVyYmVydC1ncm92ZS1kb3JzZXktMTAyNC5qcGc%3D/40/50/webp "New fathometer used at full speed. Washington, D.C., May 7. Dr. Herbert Grove Dorsey of the U.S. Coast and Geodetic Survey has invented an instrument to secure the precise measurement. The machine sends a sound, pitched so high that it is above audibility, traveling thru the water a known speed, the sound hits the bottom and returns as an echo at 20 times per second. The fathometer is so accurate that a change in depth of three inches can be detected. the indications are made by a flash from a neon tube, viewed thru a rotating disc, the flash of light appearing to stand still and the depth is read as easily as a clock. The instrument indicator is installed in the pilot house (at the top of the machine) and the transceiver (the disc at the right of the machine [?]) is located in the hull of the ship, 5/7/1937")
New fathometer used at full speed. Washington, D.C., May 7. Dr. Herber...
Public domain photograph of people in office, interior, the 1910s-1920s America, free to use, no copyright restrictions image - Picryl description
West Texas farmer replanting cotton. Had three inches of rain which wa...
Public domain photograph - historical image of Texas, United States, free to use, no copyright restrictions image - Picryl description
An Ohio manufacturer is looking for two and thirteen-sixteenths inch a...
Public domain photograph of 1930s America, free to use, no copyright restrictions image - Picryl description
West Texas farmer replanting cotton. Had three inches of rain which wa...
Title and other information from caption card. Electronic surrogate made from item with the same number in the LC-USF34 series. Transfer; United States. Office of War Information. Overseas Picture Division. Was... More
Cutting screen door stock to measurement. This material is known as 54...
Title and other information from caption card. Transfer; United States. Office of War Information. Overseas Picture Division. More information about the FSA/OWI Collection is available at http://hdl.loc.gov/loc... More
Production. Milling machines and machine castings. Welders, too, are b...
Public domain photograph of the United States military and military-industrial complex before World War Two, 1930s, free to use, no copyright restrictions image - Picryl description
Rammed earth construction near Birmingham, Alabama. The prepared earth...
Public domain photograph of Alabama in 1930s, free to use, no copyright restrictions image - Picryl description
