Audsley, W. (William), 1833-1907, Audsley, George Ashdown, 1838-1925 · London ; Glasgow ; Edinburgh : William Mackenzie · leaf 525
hod, which is often resorted to in theworkshop for producing an ellipse. In the preceding figure, if the transverse and conjugate axesare given, the foci are determined by taking half the tranverse axis, as a g, and with that extent inthe compasses, and on the extremity c of the conjugate as a… … to them by its extremities, a pencil so applied to the thread as to keep it continually stretched,or forming two straight lines, will, if progressively moved about the centre, describe the ellipse.Thus, in the figure before us, hcf may be supposed to be the thread, which, if graduallymoved round…
Architecture, Domestic · Architecture, Gothic
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