Higbee, F. G · New York, John Wiley & Sons · leaf 212
them as shown. This curve will be the required ellipse. To draw a tangent to an ellipse from a point without the curve. Locate F and F, the foci of the given ellipse. Let L be thegiven point at which the tangent is to be drawn. Draw LF, andwith LF as a radius and L as a center describe the arc FR.… … To draw a parabola when its axis, its vertex, and a point onthe curve are given. Let AB be the axis, A the vertex, and D a point on the curve.Draw DC and AC and divide each into the same number of equalparts, thus locating points i, 2, etc., and a, b, c, etc. Draw Ai,A2, A3, A4, As, A6, A7, and…
Geometry, Descriptive
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