rresponding diametral Let P P, in Fig. 358, be a portion of the pitch circle and A j\ of 4 inches is 3xV, that is the length of B C. We then pitch we again simply divide 3-1416 by the given arc pitch. B a line drawn tangent to any part of it (care being taken to mark on B C the working depth of the… … render this method thoroughly reliable. To show the differ- ence, in the case in point, between the arc and chordial Thidtness of toolh pitches, we may, in this construction, set the compasses to Breadlh g sjoace the distance of C F and draw the segment of circle, H; and the distance between the…
