Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 253
ts p p, and is, like the bar b, screwedin the plates m and n. The surface of the instrument is plain, whereas the lower base is roundedaccording to the form of the chamber, (see Fig. 691.) The boring of spherical chambers is very different; it requires a great number of borers. To showtheir… … £- r~ i> i- CANNON. 251 blade, together -with another rounded in accordance with the form of the chamber. Fig. 699 illustratesthe shape of the borings, -which are marked with ciphers in their order of succession. All these bladesare inserted into the head of a particular boring-bar. The chief…
Mechanical engineering · Mechanics · Engineering
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