The American house-carpenter; a treatise on the art of building, and the strength of materials (1873)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York : J. Wiley · leaf 257
t. Example. — A span of 17 feet, in a dwelling, is to be coveredby white pine beams. 3 X 12 inches, at what distance apartfrom centres must they be placed ? By the rule, 1728, thecube of the depth, multiplied by 3, the breadth, equals 5184.The cube of 17 is 4913, this by TO, the value of x, ror… … Fig. 227 the bearing, the beams are framed into a piece, 5, (Fig. 227,)called a header. The beams, a #, into which the header i8framed, are called trimmers or carriage-beams. These framedbeams require to be made thicker than the common beams.The header must be strong enough to sustain one-half of…
Carpentry · Architecture
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