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)
Fig. 97. part of the piece represented, as will be seen from thefollowing examples. In Figure 97 is a piece thatcontains a hole, the fact being shown by the circle
Mechanical drawing
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