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 313
f the arch stones thatpresses upon the framing at the various angles of inclinationformed by the bed of the stone with the horizon. The press-ure perpendicular to the curve is equal to the weight of thearch stone multiplied by the decimal 0, when the angle of inclination is 32 degrees. 04 08 12 \1… … From this it is seen that at the inclination of M degrees thepressure equals one-quarter the weight of the stone; at 57 de-grees, half the weight; and when a verticalline, as a h, {.Fig. 258,) passing through thecentre of gravity of the arch-stone, does notfall within its bed, c d, the pressure may…
Carpentry · Architecture
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