Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 58
lineforming an ellipse, which should be lightly andsmoothly drawn in by hand and afterwards drawnfirmly by means of irregular curves. This completesthe front elevation. This and the following lessonsshow curves developed by intersecting lines, and allmake the use of the irregular (sometimes called… … 63 54 A MANUAL OF MECHANICAL DRAWING, CHAPTER VI. Plate 8. Conic Sections—The Parabola. The parabola is a curve which is formed by aplane which cuts a cone in a line parallel with one ofits sides, and is a curve of which any point is equallydistant from a fixed point, called its focus, and from…
Mechanical drawing
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