Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 375
1520. CONCHOID DELINEATOR,of Nicomedes. A slotted head T-piece,A, B; a slotted arm, G H, with traversepin at F. Distance between F, H, andpin at E may be variable to suit therequired condition of curve. Pencil atH delineates a conchoidal curve, usedin architectural drawings for the linesof columns.…
Mechanical movements
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