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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 228

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 228
0 degrees it is reduced to tV of thatamount, that is, to ttIitt). Conversely, let O B be a tan-gent of given length; make OF=i^ O B; then withcentre F and radius F B describe an arc cutting thecircle O D G (tangent to O B at O) in the point D-;then O D will be approximately equal to O B, the… … Fig. 253.dinary drawing instruments make them exceedinglyconvenient, and they should be more widely knownthan they are. Their application to the presentproblem is shown in Figure 253, which represents a 214 MECHANICAL DRAWING SELF-TAUGHT. quadrant of an ellipse, the approximate arcs C D^E, E F, F A…

Mechanical drawing

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