Arkivism
Checks railroad signal glasses for government. Washington, D.C., Sept. 29. Red should be read and orange should be orange and never should the colors in railroad signal glasses be so near alike as to confuse a trainman. The Government, through Mrs. Geraldine W. Haupt, Color Expert of the National Bu
Public domain

Checks railroad signal glasses for government. Washington, D.C., Sept. 29. Red should be read and orange should be orange and never should the colors in railroad signal glasses be so near alike as to confuse a trainman. The Government, through Mrs. Geraldine W. Haupt, Color Expert of the National Bu

Harris & Ewing · 1937-01-01 · photo, print, drawing

From the collection of Library of Congress. Free to download, adapt and use — no permission needed.

Subjects
washington (d.c.)district of columbiaglass negativesunited states
Credit lineChecks railroad signal glasses for government. Washington, D.C., Sept. 29. Red should be read and orange should be orange and never should the colors in railroad signal glasses be so near alike as to . 1937-01-01. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.
Open in Explore View at source

Similar works

SEAL OF THE UNITED STATES. STAMPING BONDSSEAL OF THE UNITED STATES. STAMPING BONDS 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 equiColor 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 equi Interesting job with Uncle Sam. Washington, D.C., Oct. 13. One volt after another is all in the day's work for Mrs. L.H. Brickwedde, who is a battery expert for the National Bureau of Standards. Using a potentiometer - or in other words, a standard cell comparator - Miss Brickwedde is shown calibratInteresting job with Uncle Sam. Washington, D.C., Oct. 13. One volt after another is all in the day's work for Mrs. L.H. Brickwedde, who is a battery expert for the National Bureau of Standards. Using a potentiometer - or in other words, a standard cell comparator - Miss Brickwedde is shown calibrat Woman, Bureau of StandardsWoman, Bureau of Standards NO CAPTIONNO CAPTION NO CAPTIONNO CAPTION