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)
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 … is sliown by the dotted curve ^«,-, in the construction forfinding the curve for square-threaded nuts in Fio-ure 2 I 2. SCREJV THREADS AND SPIRALS. i5t A Specimen of the form of template for drawingthese curves Is shown In Figure 213 ; g g, Is the cen-tre Hne parallel to the edges R, S; lines m, n,…
Mechanical drawing
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