. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. 15 - 106=4-4, which gives wL = f>-2, which multiplied by 1 foot, or double the tiiicknessof the keystone, will give 6-2, the square foot of whicli is 2*49, or a trifle under 2 It. 6 in.,instead of 2 ft. 8 in. and 9 lines, marked in the tables. This measure of 2^*^^ ft., or 2 ft. 6 in., is to be placed from B to 4,and the quarter circle and chord line drawnaccording to the rise of the arch. 14 99c/. The geometrical method of drawingit will be to p
. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. 15 - 106=4-4, which gives wL = f>-2, which multiplied by 1 foot, or double the tiiicknessof the keystone, will give 6-2, the square foot of whicli is 2*49, or a trifle under 2 It. 6 in.,instead of 2 ft. 8 in. and 9 lines, marked in the tables. This measure of 2^*^^ ft., or 2 ft. 6 in., is to be placed from B to 4,and the quarter circle and chord line drawnaccording to the rise of the arch. 14 99c/. The geometrical method of drawingit will be to place the double of the thickness ofthe vault from B to v, and ml, from B to /;,and describing on 7ili, as a diameter, a semicirclewhicli shall cut the horizontal BO, giving thethickness to be jiliced from B to 4 on the clioidline ; the remainder of the operation will be asabove described. 1499e. If the thickness CD and KN of anextrados portion of a vault, be not the same asindicated in the tables, the sum of the thick-masses intended to he given is to be placed fromB to n, and wzL from B to h, and thea theprocess goes on as above described.
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Keywords: ., bookcentury1800, booksubjectarchitects, booksubjectarchitecture
