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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 54

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 54
ees of a circle; but, as one-half of the circle issimply a repetition of the other half, it is not neces-sary for mechanical purposes to deal with more thanone-half, as is done in Figure 56. As the wholecircle contains 360 degrees, half of it will containone-half of that number, or 180; a quarter… … b^. 56. off into decrees and half-degrees; but it is sufficientfor the purpose of this explanation to divide off onequarter by lines 10 degrees apart, and the other by lines5 degrees apart. The diameter of the circle obviouslymakes no difference in the number of degrees con-tained in any portion of…

Mechanical drawing

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