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)
endency 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… … Fig. 35- In Figure 35 is shown a German instrument espec- PREPARATION AND USE OF INSTRUMENTS. ^^ ially designed to avoid this slipping. The pecuharityof this instrument consists in the arrangement of thecentre point, which remains stationary whilst the pen
Mechanical drawing
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