Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 199
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 point, the pressure is inconsiderable. 184 AMERICAN HOUSE-CARPENTER. but gradually increases towards the crown. At… … 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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