The machinist and tool maker's instructor, containing an easy method of calculating and laying out difficult work in the machine shop .. (1896)
Genung, Edward. [from old catalog] · New York [Press of J. B. Savage, Cleveland] · leaf 45
iece; thus, a piece of round stock two inches in diameter will make a decagon .951 X 2 = 1.902 inches for the short diameter. Figure 33 is a polygon oftwelve sides (called a dodec-agon. Having the shortdiameter (across the flatsides), to find the diameteracross the corners multiplythe secant of 15°… … EHE MACHINIST AND TOOl, MAKERS INSTRUCTOR. 41
Machinery
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