Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 72
ssity used wood. As the necessary bridgeswere of considerable span, the only feasible method was to pintogether small pieces of wood so as to form a connected series oftriangles. To make rigid joints in wood was impracticable, andindeed rigid joints were not desired, because the strength of woodis… … Pin connecting parts of a bridge. 38 FORM-BRIDGES connected design, takes more time to build, but demands some-what less skill. To provide for changes in length as a bridge issubjected to variations of temperature, friction rollers are usedto support its extremities. In the first suspension bridge…
Inventions · Inventors
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