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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 67

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 67
r in proportion as thedistance apart of the foci is diminished ; and,5 66 MECHANICAL DRAWING SELF-TAUGHT. 5th. That an ellipse may be given any requiredproportion of width to length by locating the foci atthe requisite distance apart. The form of a true ellipse may be very nearly ap-oroached by… … Fig. 78. were pencilled in by means of pins and a loop of twine,as already described, but which were inked in by find-ing four arcs of circles of a radius that would mostclosely approach the pencilled line ; a b are the fociof all three ellipses A, B, and C; the centre for theend curves of a are at…

Mechanical drawing

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