"Nonius" Quotes from Famous Books
 ... 10 Inches radius, graduated to 15 which by the assistance of the nonius was devisible to 15"; and half of this sum by means of the micrometer could readily be distinguished, therefore-7.5" of an angle was perceptible with this instrument; she was also furnished with three eye-pieces, ...
— The Journals of Lewis and Clark • Meriwether Lewis et al |
