Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 55
Frames of four sides. For rigidity diagonals are needed, AC, BD. 20 FORM-BRIDGES … Cross-section of the Roosevelt, Commodore Pearys new Arctic ship. Reproduced by permission from the Scientific American, New York. Wrought iron exerts about as much resistance to compressionas to tension; so does steel. For this reason, and on account oftheir great strength, they have immense value…
Inventions · Inventors
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