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 99
r of theellipse into several parts, each to give two radii for foursymmetrical points on the curve. With each radius taken 90 Notes on Practical Mechanical Drawing the four symmetrical points are obtained by striking arcsfrom both focii above and below the major axis. For careful drawing, more… … struction for other points. Otherwise, there are apt to be errors m intersecting arcs. 32. To construct an ellipse by the method of the trammel. The trammel is an instrument for mechanically con-structing an ellipse, not very successful practically, becauseof its lack of adaptability and its…
Mechanical drawing
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