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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 328

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 328
s unquestionably necessary that it havepower largely in excess of the work requir^d of it, andalso that the friction shall represent a very low per-centage of that power. In respect to this, especialmeans have been employed to reduce the friction ; the Jl EXAMPLES IX EXGINE WORK. ^93 valve being… … Fig. 312—Governor. at full speed is enormous, the spring to counteract ithaving to sustain from two to three thoztsand pounds.Under these circumstances, as might be expected, theregulation is remarkably good. This is a very impor- ^94 MECHANICAL DRAWING SELF-7 AUGHT. tant consideration in an engine…

Mechanical drawing

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