Practical mechanical drawing and machine design self taught .. (1907)
Westinghouse, Charles. [from old catalog] · Chicago, F. J. Drake & co. · leaf 57
he first radius, describe a second arccutting the first. The points of intersection ofthese arcs will be points, the sum of whose disp tances from the foci will equal the major axis, andtherefore points of an ellipse. Similarly find asmany points as may be necessary to enable thecurve to be drawn… … The Ellipse—2. be the foci, and this must be so since the sum ofthese distances is equal to the major axis, and thepoint C being midway between A and B the twolines CE and CF must be equal. Again, if themajor axis and foci are given, with a radius equalto one-half this axis describe arcs from the…
Mechanical drawing · Machine design
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