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 201
in mortar or not. For general pur-poses, the point at which the pressure commences, may be con-sidered to be at that joint which forms an angle of 32 degreeswith the horizon. At this pumt, the pressure is inconsiderable, 184 AMERICAN HOUSE-CARPENTER. but gradually increases towards the crown. At an… … Fig. 232. the arch-stone, does not fall within its bed, c d, the pressure maybe considered equal to the whole weight of the stone. This willbe the case at about 60 degrees, when the depth of the stone isdouble its breadth- The direction of these pressures is consid-ered in a line with the radius of…
Carpentry · Architecture
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