Miss Grace Stockman with ancient clay discs, 1/22/26
A black and white photo of a woman holding a teddy bear. Public domain portrait photograph, free to use, no copyright restrictions image - Picryl description
NAVY YARD, U.S., WASHINGTON. DISCS AND WORK ON THEM
Public domain historical photo, free to use, no copyright restrictions image - Picryl description
Ancient clay discs at Smithsonian (Grace Stockman), 1/22/26
A black and white photo of a woman holding a glass. Public domain portrait photograph, free to use, no copyright restrictions image - Picryl description
![Color expert for Uncle Sam. Washington, D.C., June 20. When it was discovered that color plays an important [role] in marketing of cotton, Miss Dorothy Nickerson, Color Technologist of the U.S. Department of Agriculture, developed a method for measuring the color of raw cotton mechanically. The equipment comprises a comparator, a motor on which to spin standard color discs, the color discs, and standard artificial daylight. When looking through the comparator, the operator sees a circular field, the upper half made up of the color of the cotton and the lower half made up of the disc colors, 6/20/38](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzIwMTUvMTEvMjUvY29sb3ItZXhwZXJ0LWZvci11bmNsZS1zYW0td2FzaGluZ3Rvbi1kYy1qdW5lLTIwLXdoZW4taXQtd2FzLWRpc2NvdmVyZWQtdGhhdC0xMDI0LmpwZw%3D%3D/40/32/webp "Color expert for Uncle Sam. Washington, D.C., June 20. When it was discovered that color plays an important [role] in marketing of cotton, Miss Dorothy Nickerson, Color Technologist of the U.S. Department of Agriculture, developed a method for measuring the color of raw cotton mechanically. The equipment comprises a comparator, a motor on which to spin standard color discs, the color discs, and standard artificial daylight. When looking through the comparator, the operator sees a circular field, the upper half made up of the color of the cotton and the lower half made up of the disc colors, 6/20/38")
Color expert for Uncle Sam. Washington, D.C., June 20. When it was dis...
A black and white photo of a woman typing on a typewriter. Public domain portrait photograph, free to use, no copyright restrictions image - Picryl description
![Traffic paint undergoes rigid tests. Washington, D.C., April 16. At the U.S. Bureau of Standards, J.E. Keefauver of the Bureau has been running tests on the paint that is placed on safety zones and streets to determine which has the best wearing activity. The discs [?] are painted with the traffic paint the chain-driven wheel of eraser rubber (to imitate an auto tire) slowly wears the paint away. The brushes are to keep the disc and tire clean. These tests were made at the requests of the traffic bureaus, 4/16/1937](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzE5MzcvMDEvMDEvdHJhZmZpYy1wYWludC11bmRlcmdvZXMtcmlnaWQtdGVzdHMtd2FzaGluZ3Rvbi1kYy1hcHJpbC0xNi1hdC10aGUtdXMtYnVyZWF1LTEwMjQuanBn/40/50/webp "Traffic paint undergoes rigid tests. Washington, D.C., April 16. At the U.S. Bureau of Standards, J.E. Keefauver of the Bureau has been running tests on the paint that is placed on safety zones and streets to determine which has the best wearing activity. The discs [?] are painted with the traffic paint the chain-driven wheel of eraser rubber (to imitate an auto tire) slowly wears the paint away. The brushes are to keep the disc and tire clean. These tests were made at the requests of the traffic bureaus, 4/16/1937")
Traffic paint undergoes rigid tests. Washington, D.C., April 16. At th...
Public domain historical photo, free to use, no copyright restrictions image - Picryl description
NAVY YARD, U.S., WASHINGTON. DISCS AND WORK ON THEM
Public domain historical photo, free to use, no copyright restrictions image - Picryl description
NAVY YARD, U.S., WASHINGTON. DISCS AND WORK ON THEM
Public domain historical photo, free to use, no copyright restrictions image - Picryl description