Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 60
hesepoints are points through which the plan of the para-bola is to be drawn, and all are determined lay the in-tersections of the lines, except O J and O J. Wherethe plane G H intersects the centre line J B of the conedraw M N parallel with the base, JJ is equal to M N. To complete the elevation… … 56 56 A MANUAL OF MECHANICAL DRAWING. Plates 9 and 10. The Hyperbola.If a cone ABC (Fig. 10), of which A C is the base,is cut by a plane J K, parallel with but not through itsaxis, B G, and perpendicular to its base, the outline ofthe section thus obtained will be an open curve called ahyperbola,…
Mechanical drawing
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