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 106
points, A and B, although verynearly. To find the point of tangency, of the curve with anyone of the lines, say 1-1, lay off a distance on the axis, OE,equal to OD. At E erect a perpendicular to cut 1-1 in thepoint of tangency. Irregular Curves and Geometrical Drawing 97 37, To draw a hyperbola by… … fixed line, called the directrix, is a constant and greater thanunity (see Fig. 23). We shall work the problem, however, by the principlethat the difference between the focal radii to any point onthe curve is a constant. Let F F be the focii, and O thecenter. Assume the vertices of the curve, A A^…
Mechanical drawing
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