Building construction and superintendence, by F.E. Kidder ... (1896)
Kidder, Frank E. (Frank Eugene), 1859-1905 · New York, W.T. Comstock · leaf 453
.Hi 13 9 inches.iU 13 The breadth or thickness of compound beams should be not lessthan two-fifths of the depth. The number of keys required is notaffectedby the length or breadth of the beam, if the beam is figuredfor the full safe load. In spacing the keys (Fig. 489) they should not be closer… … Plan of 14 *24 spruce beam-36span . Fig. 489. keys, centre to centre, works out less than the minimum spacing, thesafe load should be correspondingly reduced or the thickness of thebeam increased. For beams uniformly loaded, the first four or five keys from theends should be spaced for minimum…
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