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)
tooth point for a 4 inch pitch, wouldbe measured along the line B C, from the vertical lineB to the first diagonal. The thickness of the toothwould be for a 4 inch pitch along line B C from B tothe second diagonal, and so on. For a 3 inch pitchthe measurement would be taken along the… … Fig. 236. The application of the scale is as follows: The pitchcircles P P and P P, Figure 236, for the respectivewheels, are drawn, and the height of the teeth is ob-tained from the scale and marked beyond the pitchcircles, when circles Q and Q may be drawn. Sim-ilarly, the depths of the teeth…
Mechanical drawing
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