The American house carpenter: a treatise upon architecture, cornices and mouldings, framing, doors, windows and stairs. Together with the most important principles of practical geometry (1852)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 168
thecommon joists. But it is well to have a rule for determining thesize more acciuately in extreme cases. 270.—When the bearing exceeds 8 feet, there should be struts,as a and a, [Fig- 202,) well nailed between the joists. Thesewill prevent the turning or twisting of the floor-joists, and… … Fig. 202. upon the undex^ide. When the length of bearing is great, strutsshould be inserted at about every 4 feet. 271.—Single-joisted floors may be constructed for as great alength of bearing as timber of sufficient depth can be obtained;but, in such cases, where perfect ceilings are desirable,…
Carpentry · Architecture
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