The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 115
r nail, draw np the chain till thebottom of the curve correspond with the extremity of the perpendicular,and when in that position make the chain fast to the nail over whichit was passed. This done, trace upon the wall, with charcoal or other-wise, one half of the curve formed by the freely… … Let A B (in fig 1) be the breadth of the required arch, and C D itsheight. Set oft on the wall (fig •2) E F=2 C D ; from the centre G,of E F, let fall G =H— The chain being fastened at E, and then passed over F, and drawn np until the bottom of the curve correspondwith H, make fast at F. Now the…
Architecture · Civil engineering · Science
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