Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 721
690 SAFES. 3717. … alternate sections of hard andsoft steel welded together, frank-linite, and a lining of soft iron.The thickness of the variousmaterials was as follows: Steel,2.6 in.; franklinite, 2.1 in.; softiron, 0.42 in.; total thickness,5.12 in. Drills of the best hard-ened steel were used. Thesewere held in a…
Mechanical engineering -- Dictionaries
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