The American house-carpenter; a treatise on the art of building, and the strength of materials (1867)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 255
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 1*0, the value of aj, tor… … Fig. the bearing, the beams are framed into a piece, 5, {Fig. 227,)called a header. The beams, a a, into which the header isframed, are called trimmers or carriage-lyeams. 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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