Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 69
H U WO o Q o P4 pq CO 34 FORM-BRIDGES … Continuous girder bridge, Canadian Pacific R. R., Lachine,near Montreal. elements of gain are brought out in placing a strip of rubber, AD,upon four equidistant points of support, when we find that BC,the central third of the strip sags less than either AB or CD, the
Inventions · Inventors
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