Notes on practical mechanical drawing, written for the use of the students in general engineering drawing in the University of Illinois (1907)
Wilson, Victor Tyson, 1864- [from old catalog] · State College, Pa., The author · leaf 97
allel to any position of the moving line, as b—b, theshape of the section will be a parabola. If the cone is cut bya plane making a less angle with the axis than that of therevolving line, as c—c, the shape of the section will be ahyperbola. In any other position, the cutting plane wouldgive an… … 31. To draw an ellipse by the focii method. To draw it by the principle, in other words, that thesum of the focal radii to any point on the c^lr^e is a constant(see Fig. 17). The constant is equal to 2a. The focal radiiare F P and FT, respectively. When the major and minor axis are given, the…
Mechanical drawing
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