A hand book of general instruction for mechanics, containing useful rules and memoranda for practical men (1907)
Smith, Franklin Elijah, 1872- · New York, D. Van Nostrand company · leaf 335
m is supposed to befixed, and that it gradually diminishes toward the load. Therefore it is customary, when constructing beams ofthis nature, to make them strongest where the greateststress comes. (Fig. 123.) 6 Fig. 123 322 A HAND BOOK FOR MECHANICS Example. If the greatest stress allowed on… … Fig. 124 2 tons = 4000 lb. 4000 X 66 = 264,000 lb. stress at A. Let us now employ a factor of safety of 4 for wroughtiron. That is, consider the stress 264,000 at A to be 4times greater = 1,056,000 lb. Then, 1,056,000 h- 52,000 = 20.31 square inches. Arts. Example. A beam 56 inches long fixed at…
Mechanics · Arithmetic · Measurement
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