The principles of pattern making, written specially for apprentices and students in technical schools (1900)
Horner, Joseph Gregory, 1847-1927 · London, New York, Pitman · leaf 108
und. Very much can be done with paper templetsin screws and screw gears more readily than by obtain-ing a number of points of intersection. The papermethod exemplifies the fact that an inclined planewrapped around a cylinder develops the screw. Inangle wheels and in worms the use of paper affords… … Fig. 73. Tooth Block for Worm Wheel. they can only be drawn back horizontally. If madeloose the backing A can be lifted vertically, and theteeth B withdrawn by the fingers in a horizontaldirection. This is the better plan. For the samereason it is better to make the teeth B for the screwwheel in…
Patternmaking
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