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 105
ope, (See Fig. 22.)If the approximate spread of the parabola as AB,together with the axis and approximate vertex, O, areknown, the method is as follows: Prolong the axis andmake the distance from O to C equal the distance from O tothe line, AB. Divide the lines, AC and CB, into the same 96 Notes on… … obtained with a fair degree of accuracy. The curve doesnot exactly go through the 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…
Mechanical drawing
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