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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 151

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 151
Fig. 200. be necessary if the corner be a round one, if the stemis reduced in diameter, as in Figure 200. Figure 201 represents a centre punch, giving an … Fiu:. 201. example, in whicli the flat sides gradually run outupon a circle, thc^ edges forming curves, as at A, B,etc. The length of these curves is determined as fol- EXAMPLES IX BOLTS, XUTS, AXD POLYGOXS. 151 lows: They must begin where the taper of the punchjoins the parallel, or at C, C, and…

Mechanical drawing

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