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)
in diameter, and at a pressureof 60 lbs. per square inch. A joint composed of twoI-inch plates, and having holes i and one-eighth in.in diameter, can be drilled in about 2^ minutes, andallowing about half a minute for adjusting the drill,each drill will do about 20 holes j:)er hour. Themachine is… … ^^-^-^ ?- 2 . 4 „ C J- I —1 I. Fig. 2^
Mechanical drawing
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