Uncle Sam istrying to find a way for automobile tires to wear longer for 25,000,000 motorists. Wearing specimens of rubber to [...] that then 25,000,000 owners of automobiles may have tires that last longer is a [...] now in progress at the Bureau of Standards. W.L. Holt of the Rubber Section is shown with a new abrasive machine that rubs [...] of rubber away or to a thinness that [...] determine their relative wearing quality
Summary
Public domain photograph of laboratory, scientist, free to use, no copyright restrictions image - Picryl description
Glass negatives of cars and trucks of 1910-1930
Tags
Date
01/01/1930
Contributors
Harris & Ewing, photographer
Location
Source
Library of Congress
Copyright info
No known restrictions on publication.