Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 375
fixed centre describes a helical curve. c t^^^^^^^^l 1519. GREAT CURVE DELINEA- B |_ TOR. — Thin-edged ^^^ =q, discs of different di- rameters are attachedto a bar or tube at a distance apart, so that their relative diam-ters and distance will correspond to the required radius, which maybe computed… … 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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