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)
them firmly to the squ THE DRAWIXG BOARD. 21 blade without moving it, and without permitting themto move upon it. The learner will find that this isbest attained by so regulating the height of thesquare-blade that the line to be drawn does not comedown too near the bottom of the triangle or edge… … CURVES. To draw curves that are not formed of arcs or partsof circles, templates called curves are provided, exam-ples of these forms being given in Figure 6. Theyare made in wood and in hard rubber, the latter beingmost durable ; their uses are so obvious as to requireno explanation. It may be…
Mechanical drawing
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