Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 165
nto a piece, (6, Fig. 201,)called a trimmer. The beams, a, «, into which the trimmer isframed, are called trimming-bemns, trimm,ing-joist.9, or car-riage-beams. They need to be stronger than the commion joists,in proportion to the number of beams, c, c, which they support.The trimmers have to be… … beams must each be strong enough to support half the weightwhich the trimmer supports. In calculating for the dimensionsof floor-timbers, regard must be had to the fact that the weightwhich they generally support—such as persons of 150 poundsmoving over the floor—exerts a much greater influence…
Carpentry · Architecture
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