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)
I04 MECHA hUCAL DKA WING SELF- TA UGHT. when In place upon the machine pf which it formsa part. Thus in Fi^^ure 140 is a lever, and if its shaftstood horizontal when the piece is in place in the
Mechanical drawing
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