Audsley, W. (William), 1833-1907, Audsley, George Ashdown, 1838-1925 · London ; Glasgow ; Edinburgh : William Mackenzie · leaf 526
at any distance from each other. On the sockets, b and d, small sheaves arefitted to revolve on pins, and the centre one, c, is fitted to receive a pencil or tracer. To explain the action of this apparatus, we shall suppose a b to be the transverse, and c n theconjugate axis of the required… … centres of the sheaves on the sliding bar to move exactly over the centre of the lines constitutingthe axes of the ellipse. To adjust the position of thesockets to produce the given ellipse, the distance betweenthe pencil and the sheave, b, is made equal to half thelength of the transverse axis,…
Architecture, Domestic · Architecture, Gothic
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