Written on verso: 'Machine for testing steel at high temperatures at U.S. Bureau of Standards Washington, D.C. (Dr. H.J. French in charge assisted by A.L. Meyer at that time Metallurgical Engineer Lukens Steel Co.)'
Written on verso: 'Machine for testing steel at high temperatures at U.S. Bureau of Standards, Washington, D.C. (Dr. H.J. French in charge, assisted by A.L. Meyer at that time metallurgical engineers Lukens Steel Co.)'
