Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 850
3 15 17 19 28 26 60 5 10 12 14 16 18 20 25 29 80 ■ •• 9 11 13 15 17 19 21 26 30 100 ... ... 1 . . 18 20 22 31 150 ... ... 5 6 ... 14 16 19 21 23 27 32 Rack. 4 ... ... ... 10 12 15 17 20 22 25 30 34 GEERING. 839 The double curve df is also true for an annular wheel of the same number of teeth, /… … The numbers for pitches not stated in the table, may be obtained from the column of some otherpitch by direct proportion. Thus for 4-inch pitch, by doubling the number of the column of the 2 inchpitch; for 4£ by doubling 1\, and so on; or if the difference be small, the column belonging to the
Mechanical engineering
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