nonius scale

, or vernier

That fixed to the oblong opening near the lower end of the index-bar of a sextant or quadrant; it divides degrees into minutes, and these again into parts of seconds.

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Nonius
Nōnĭus, a, the name of a Roman gens. So M. Nonius Suffenas, Cic. Att. 6, 1, 13.— Nonius Marcellus...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
Nonius
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nonius scale

The Sailor's Word-Book

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