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)
rve h. In inking in it isbest to draw in all curves or arcs o{ circles first, andthe straight lines that join them afterward, because, ifthe straight lines are drawn first, it is a difficult mat-ter to alter the centres of the curves to make them 144 MECHANICAL DRAWING SELF-TAUGHT. fall true,… … taken not to draw them too short or too long, as thiswould impair the appearance very much, as is shownin Figure 187.
Mechanical drawing
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