Mechanical drawing self-taught: comprising instructions in the selection and preparation of drawing instruments. Elementary instruction in practical mechanical drawing. Together with examples in simple geometry and elementary mechanism, including screw threads, gear wheels, mechanical motions, engines and boilers (1889)
a direct application of thecompasses. A scale of this kind is given in Figure235, in which the line A B is divided into inches andparts to represent the pitches; its total length repre-senting the coarsest pitch within the capacity of thescale; and the line B C (at a right-angle to A B) the 3TO of… … j Depth of Pitch Line• Thickness of Tooth _Wi_dth_of_Space Working Depth of Tooth j Whole Depth of Tooth Fig. 235. The other diag^onal lines are for the proportion ofthe dimensions marked on the fieure. Thus the DRAWING GEAR WHEELS. 197 depth of face, or distance from the pitch line to theextremity…
Mechanical drawing
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