Impact and Shock Resistance of Plastics Project : John Edwards and Robert Penny with pendulum-type machine used for testing plastic test piece, 1957 January.
North Carolina State University. College of Engineering
Peedin, Mack (Photographer)
Black-and-white print (photograph)
Rights status not known. Reproduction and use of this material may be restricted. For general information see the NCSU Libraries Special Collections Research Center website (http://www.lib.ncsu.edu/specialcollections/research).