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 152
Construct the parallelogram of forces P V Q M {:^g. 213). V M rep-resent the resultant of the two forces P and Q. The actual friction isalways a certain given fraction of P acting parallel to the impressed sur-face. Take M Q equal to this given fraction of P M, complete the paral-lelogram, and draw… … Fig. 212. M Q Q Fis. 213.
