Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 52
W CONSTRUCTION OF GEOMETRICAL PROBLEMS. 35 lybelonging to the hyperbola, and answering the definition; so that the hyper-bola consists of two separate branches. The curve may be described mechanically (Fig. 110) by fixing a ruler toone focus, F, so that it may be turned round on this point, and… … Fig. 110. Fig. 111. keeping this cord always stretched, and at the same time pressing against theedge of the ruler, will, as the ruler revolves around F, describe an hyperbola. To draw a tangent to any point of an hyperbola (Fig. 111). Let P be the point. On F P lay off P jt?, equal to F P ; draw…
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
