Fry, Horace Pugh. [from old catalog] · Philadelphia [The John C. Winston co.] · leaf 51
48 SCREW THREADS. … 1. If a point moves on the surface of acircular cylinder, so that its motionaround the axis and parallel to the axisis uniform, the path of the point is ahelix or screw curve. 2. The method of drawing thehelix is shown in Fig. 28, the trueshape of a V and a square thread beingshown. When drawing…
Mechanical drawing
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