Practical draughtsmen's work, with numerous engravings and diagrams (1903)
Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 73
by Fig. 122. Lines for the smallprinting may now be ruled, and all the lettering put in neatlywith a steel writing pen. 70 CHAPTEE V. ELLIPTICAL CURVES. In the last chapter circular curves were dealt with, and by avery easy transition we pass to elliptical curves, or ellipses,commonly called… … K H B Fig. 123.—The Conic Sections, ab Triangle; c d Circle ; ef Ellipse;G H Parabola ; J k Hyperbola. The principal curves are derived from conic sections, so it willbe well now to study the different ways in which a cone may becut in the way shown by Fig. 123. A vertical section passingthrough…
Mechanical drawing
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