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Pinion and Wire Gauge

The jewelers' gauge shown in Fig. 141, will be found very useful in measuring pinions, wire or flat metal. The DECIMALS EQUALING PARTS OF AN INCH. 1/64 = .0156 1/32 = .0312 3/64 = .0468 1/16 = .0625 5/64 = .0781 3/32 = .0937 7/64 = .1093 1/8 = .1250 9/64 = .1406 5/32 = .1562 11/64 = .1718 3/16 = .1875 13/64 = .2031 7/32 = .2187 15/64 = .2343 1/4 = .2500 17/64 = .2656 9/32 = .2812 19/64 = .2968 5/16 = .3125 slot is graduated to thousandths of an inch. If in measuring a pinion it passes down the slot to number 70, then the pinion is 70/1000 of an inch in diameter.