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 146
M^mmmMM Fig. 198. Fig. 199. end of the plane d be raised, till it becomes horizontal, the whole weightwould rest on the plane, and no force would be necessary at P to keep itin position; if the plane be revolved on 5, till it becomes perpendicular,then the weight is not supported by the plane at…
