spherometern.
/sfɛˈrɒmɪtə/ An instrument for measuring the sphericality or curvature of bodies or surfaces.
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the world > relative properties > measurement > measuring instrument > [noun] > for measuring spherical curvature
spherometera1830
sphereometer1884
a1830 J. F. W. Herschel Light in Encycl. Metrop. (1845) IV. 567 The ‘Spherometer’, a delicate species of calibre contrived by M. Biot.
1830 J. F. W. Herschel Prelim. Disc. Study Nat. Philos. 355 The elegant invention of the sphræometer,..substituting the sense of touch for that of sight in the measurement of minute objects.
1876 Catal. Special Loan Coll. Sci. Apparatus S. Kensington Mus. 29 Spherometer for measuring spherical curves, with true gun-metal plane.
This entry has not yet been fully updated (first published 1914; most recently modified version published online December 2020).
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