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 (1883)
lines (a,b, c) are used to get the radius wherefrom to markthe arcs where the points In the ellipse shall fall; thus,radius a gives points i, 2, 3 and 4; radius b givespoints 5, 6, 7 and 8, and radius c gives 9, 10, 11 andI 2, the extreme diameter being obtained from lines S,Z, and H, H. CHAPTER… … 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 the13 (193) 194 MECHANICAL DRAWING SELF-TAUGHT. bottoms of the spaces, as well as the pitch circle, areconcentric…
Mechanical drawing
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