Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 212
S. 207 the depth at the crown the formula d = ,07 r + 1 foot, in which formula r is the greatest radius ofcurvature of the intrados. This formula is applicable to arches less than fifty feet radius ; hut beyondthis it gives greater dimensions than in ordinary practice. In order to facilitate… … Fig. 620. Fig. 621. Fig. 622. To find the thickness of abutment necessary to support the thrust of the arch, multiply the co-efficientfound in the table for the particular case by 3.8, and the square root of the product multiplied by theradius, r, of the intrados, will give the extreme thickness of…
Mechanical engineering
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