Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 50
nes T M, T N, are tangents to the curve. ^^^^- ^ ^~^^ ^-^.--V / fj i \ If ^^^--^ --_____ ___^^ / E Fig. 105. The Parabola. The parabola may be defined as an ellipse whose major axis is infinite ; itscharacteristic is that every point in the curve is equally distant from the direc-trix E N and… … a^
Mechanical drawing
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