Not peppermint candy but an airplane strut. Washington, D.C., May 3. This piece of aluminum alloy which is used in airplane construction is shown after being in the torque machine. The pieces to be tested are locked in the vise and twisted until they break. This piece when started the lines on the pipe were parallel and ran the length of t he pipe. After coming out of the machine the lines are like a corkscrew, before the breakig point is reached. A.E. McPhereson is applying the pressure, 5/3/1937
Summary
Public domain historical photo, free to use, no copyright restrictions image - Picryl description
Airplanes and blimps above National Mall, Washington Monument, Potomac river and around.
Tags
Date
01/01/1937
Contributors
Harris & Ewing, photographer
Location
Washington, District of Columbia, United States, 38.90719, -77.03687
Source
Library of Congress
Copyright info
No known restrictions on publication.