hat is the diametral pitch of a wheel whose arc draw A B to exactly touch the perimeter of P P). Then from pitch is 1} inches? Here 3°1416 + 1°55=2°09= diametral SCALE OF PROPORTIONS D on PP, producing the point F. A straight line drawn from GIVEN BY WILLIS points to be set. Since the least error… … 7 ‘448 1°0000 ‘ 8°14 8 8920-09375 “ 3°85 | _ very fine, and the measurements made to great exactitude to 9 850 0875 “ 3°59 ‘ render this method thoroughly reliable. Toshow the differ- 200 000 names emanegeeerere eee 10 "B14. 08125“ 3°86 , 11 280. O75 <“ 4-19 ence, in the case in point, between the…
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