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)
he other, and the lengthof twine in the loop remaining constant, it is demon-strated that if in a true ellipse we take any numberof points in its curve, and for each point add togetherits distance to each focus, and to this add the distanceapart of the foci, the total sum obtained will be thesame… … Fig. 76. Fig- 77- marked with the same loop, the difference in the twoforms being due to the difference in distance apart ofthe foci. Again, the same loop was used for ellipsesB in both fio-ures, as also for C and D. From thesefigures we perceive that— I St. With a given width or distance apart of…
Mechanical drawing
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