John Jacob Holtzapffel · digital reprint by www.CircuitousRoot.com · leaf 181
required ; a further experiment is then made with the work arrested at a fresh position, and this is repeated until the drill s found to cut equally both above and below, and all these trial marks disappear in working the ornament to its full depth. This method of adjustment is absolutely perfect… … second group commence their penetration by a dot, for these | any drill cutting a circle is first used to attain the exact height of"center and then that is exchanged for the pointed drill required for the ornament. ■ Independently of their different magnitudes and profiles of I cutting edge, the…
Ornamental turning
Internet Archive · Dr. David M. MacMillan · Public Domain Mark 1.0. Free to use for anything.
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