Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 741
e commonly employed is too well known to require description, more especially as we have alreadygiven Mr. Nasmyths improved form of this tool. The pin-drill and half-round drill are, in certain cases,extremely useful; the only objection to the former is, that it requires a small hole to be first… … ill ordinary purposes, and performs its work extremely well, although it cannot be depended on incases where rigid accuracy is required. The half-round drill offers little or no security whatever as re-gards piercing in a right line; it is, however, a very useful tool, and may, in many instances,…
Mechanical engineering
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