odontographn.
/ɒˈdɒntəɡrɑːf/, /ɒˈdɒntəɡraf/, /əʊˈdɒntəɡrɑːf/, /əʊˈdɒntəɡraf/, U.S. /oʊˈdɑn(t)əˌɡræf/ Now historical.
An instrument for marking or setting out the teeth of gearwheels so that they mesh accurately.
ΘΚΠ
society > occupation and work > equipment > equipment for marking out work > [noun] > others
jointing-rule1700
tracing-pin1712
pitch-board1733
skirret1825
odontograph1838
bevelling-board1850
fencing-gauge1874
tingle1886
shadow-stick1900
1838 R. Willis in Minutes Proc. Inst. Civil Engineers 32 From these investigations the author was led to construct an instrument for setting out the teeth of wheels..which has been termed an Odontograph.
1857 Encycl. Brit. XIV. 396/1 To facilitate the drawing of epicycloidal teeth in practice..Mr. Willis has published tables of ρ–c and ρ′–c, and invented an instrument called the ‘Odontograph’.
1866 W. T. Brande & G. W. Cox Dict. Sci., Lit. & Art (new ed.) II. 705/1 Tables are given on the odontograph for finding the graduation on the scale corresponding to any given pitch and number of teeth.
1886 Manufacturer & Builder Sept. 200/1 It is original..in introducing a new odontograph, in which a portion of a rack is used to delineate or envelope on a wheel a tooth-form which will properly gear with this rack.
1900 Dict. National Biogr. at Willis, Robert In 1837 Willis read a paper ‘On the Teeth of Wheels’..with a description of a contrivance called an odontograph.
1983 Financial Times (Nexis) 1 Oct. i. 15 Dr Turner's book..sets out to explain the use of such obscure devices as goniometers, sonometers, hodometers, odontographs and Madgeburh hemispheres.
This entry has been updated (OED Third Edition, March 2004; most recently modified version published online March 2022).
<
n.1838