Appleton's cyclopædia of drawing, designed as a textbook for the mechanic, architect, engineer, and surveyor (1866)
Worthen, William Ezra, 1819-1897, [from old catalog] ed, Appleton, firm, publishers, New York. (1866. D. Appleton & co.) [from old catalog] · New York, D. Appleton and company · leaf 326
centre course of voussoirsthe key-course. Tlie side portions of arches between the springing and thecrown, are termed haunches or flanks. All arches should be well sustainedby backing on the haunches, called spandrel-hacking. The line of inter-section of arches cutting across each other… … Fig. 14. Fig. 15. Fisr. 16. creases from the curve towards the springing, the depth of the voussoirsshould likewise increase from the crown to the springing. Peronnet has 218 AECHITECTUEAL DEAWING. given as a rule for the depth at the crown the formula cZ = .OT r + 1 foot,in which formula t is the…
