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)
-&• 233. tooth; E is the height or depth, and F the breadth.P P is the pitch circle, and the space between the twoteeth, as H, is termed a space. It is obvious that the points of the teeth and the*3 (193) 194 fANICAL DRAHIXG SELF-TAUGHT. bottoms of the spaces, as well as the pitch circle,… … as in Figure 234, in which P P is the pitch circle.This circle is divided into as many equal divisions as DRAWING GEAR WHEELS. 195 the wheel is to have teeth, these divisions beingdenoted by the radial lines, A, B, C, etc. Wherethese divisions intersect the pitch circle are the centresfrom which…
Mechanical drawing
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