odontograph
(əʊˈdɒntəgrɑːf, -æ-)
[f. odonto- + -graph.]
An instrument, invented by Professor R. Willis, for marking or setting out the teeth of gear-wheels.
| 1857 Rankine in Encycl. Brit. (ed. 8) XIV. 396/1 To facilitate the drawing of epicycloidal teeth in practice..Mr. Willis has published tables of ρ–c and ρ{p}–c, and invented an instrument called the ‘Odontograph’. 1866 Brande & Cox Dict. Sci., etc. s.v., Tables are given on the odontograph for finding the graduation on the scale corresponding to any given pitch and number of teeth. |