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 167
nto a piece, (6, Fig. 201,)called a trimmer. The beams, a, a, into which the trimmer isframed, are called tri?n7?iing-bearns, trimming-joists, or car-riage-beams. They need to be stronger than the common 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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