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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)

Rose, Joshua · Philaelphia, H.C. Baird & co.; [etc., etc.] · leaf 45

An illustration from 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, leaf 45
tendency to hold it too firmlyand press it too heavily, which is especially to be avoided.If in drawing a small circle the needle-point slipsout of the paper, it is because the pencil-point is toolong; or, what is the same thing, the needle-point doesnot protrude far enough out from the leg. Or if… … In Figure 35 is shown a German instrument espeo PREPARATION AND USE OF INSTRUMENTS. 45 ially designed to avoid this slipping. The peculiarityof this instrument consists in the arrangement of thecentre point, which remains stationary whilst the pen

Mechanical drawing

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