Beale, Oscar James, Brown & Sharpe Manufacturing Company (Providence, R.I.) · Providence, R.I. : Brown & Sharpe Mfg. Co. · leaf 34
ofthe circle. Draw lines OA and OA. These two lines form anangle of 29°, and are right for inclination of sides ofrack tool. PROVIDENCE, R. I. J5 Make end of rack tool .31 of cii-cular pitch, and then, width of Hack Tool at end. round the corners of the tool to leave fillets at thebottom of rack… … This sketch and the foree-oine- rule are also rieht for WormTHreada worm-thread tool, but a worm-thread tool is notusually rounded for fillet. In cutting worms, leavewidth of top of thread .335 of the circular pitch.When this is done, the depth of thread will be right.
Gearing
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-340-231.webp)
