Appleton's cyclopædia of drawing, designed as a textbook for the mechanic, architect, engineer, and surveyor (1866)
Worthen, William Ezra, 1819-1897, [from old catalog] ed, Appleton, firm, publishers, New York. (1866. D. Appleton & co.) [from old catalog] · New York, D. Appleton and company · leaf 26
K … Fig. 21. Fi?. 22. An kyj>erhola is a curve from anj point P in wliicli, if two straight linesbe drawn to two fixed points FF^ the foci, their difiference shall always bethe same (fig. 22). A cycloid is the curve described by a point P in the circumference of
