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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)

Rose, Joshua · Philadelphia, H.C. Baird & Co.; London, S. Low, Marston, Searle & Rivington · leaf 164

An illustration from 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, leaf 164
e pitch and the thread onthe other or unseen side of the bolt slants, as denotedby the Units 12, 13 ; and hence to draw the sides A B,the triangles must be set from one thread to the nexton the opposite side of the bolt, as denoted b) thedotted lines 12 and i 3. Jf the curves of the thread are to… … nate at the centre line^, and the curves e are equi-distant with the curves c from the vertical lines d. As :64 MECHANICAL DRAWING SELF-TAUGHT. the curves f above the Hne are the same as f belowthe line, the template for f need not be made to ex-tend the whole distance across, but one-half only; as

Mechanical drawing

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