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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 (1889)

Rose, Joshua · Philaelphia, H.C. Baird & co.; [etc., etc.] · leaf 327

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, 1889, leaf 327
tween its inner surface and the valve seat. Thisconstruction admits of the valve leaving the seat, ifnecessary, to relieve the cylinder from water, as in theinstance of priming, and also, by the reduction of thesepieces, admits of ready adjustment to contact, shouldit become necessary. The cover… … Fig. 308. fPage 282.)

Mechanical drawing

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