The young mechanic; containing directions for the use of all kinds of tools, and for the construction of steam engines and mechanical models, including the art of turning in wood and metal (1902)
[Lukin, James] [from old catalog] · New York, London, G. P. Putnam's sons · leaf 208
t with difficulty to require agreat deal of practice before it can be done with certainty SCREWS AND TWISTS. 193 of success. At the same time, my young friends cannotpossibly do better than practise this operation, for there arenmnberless cases in which screws cannot be convenientlycut in any other… … Fig. 51. are always made in pairs, of exactly the same pitch, i.e,^the outside tool being applied to the inside, the respectivenotches and points will exactly fit into each other. If youwere to examine the under side of these tools, shown at C,you wwald notice that the notches do not run straight,…
Mechanical engineering · Industrial arts
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