Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 65
agonals we obtain1 foot and any number of inches from 1 to 12. For the designing of machinery, it is very convenient to have some scale ofreference by which to proportion the parts; for this purpose a vertical andhorizontal scale may be drawn on the walls of the room. Vernier scales are preferred… … FiG. 147. 10 2 4\ 6 8 5 ^ _ _ _ f Jll M 1 1 1 1 1 M 1 1 M i 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 i 1 1 M 1 1 Ml 100 1 1 1 1 1 1 1 1 1 w_ 8 6 \ 4- 2 Fig. 148. divisions 1, 2, 3, from left to right. Take off now with the compasses elevenof these subdivisions, set the extent off backward from the end of…
Mechanical drawing
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