Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 379
1531&. ELLIPSOGRAPH.—A pairof dividers with points perforated likethe eye of a needle allows of adjust-ing the length of the thread to any sizecurve and holding the end under thethumb on the head of the dividers. Thepoints with their eyes are shown at theright-hand side. 368 DRAUGHTING DEVICES. … 1531a. OMNI-TELEMETER.—For obtaining the distance of an ob-ject by two observations on a line atright angles. A, direct line ofsight through the half silvered mir-ror D; X, reflected line of sight at90° or variable by the mirrors D, F.The lever L varies the angle of themirror, F, by means of the…
Mechanical movements
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