Dr. Miklos Hatenyi, Hungarian-born research engineer at the Westinghouse electric and manufacturing company. He made various types of nuts and bolts, attached weights to the bottom of each model and heated them to "freeze" the stress lines, then cut slices from the center of each model and photographed the thin plastic sections to show which nut or bolt divided the "pull" among threads
Summary
Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description
Tags
Date
01/01/1943
Contributors
Collins, Marjory, 1912-1985, photographer
Location
Pittsburgh (Pa.), 40.44056, -79.99583
Source
Library of Congress
Copyright info
No known restrictions. For information, see U.S. Farm Security Administration/Office of War Information Black & White Photographs http://www.loc.gov/rr/print/res/071_fsab.html