The naval architect's and shipbuilder's pocket-book of formulae, rules, and tables and marine engineer's and surveyor's handy book of reference (1884)
Mackrow, Clement · London, C. Lockwood and co. · leaf 153
. tan e= — 2y2x cos e= —i R sm e=^-. R 144 MECHANICAL PRINCIPLES. Fig. 120. 3. To find the re,mlta7it of three forces acting throwpi onepoint and mailing right angles with one another. (Fig. 120.) Let OA, OB, oc represent in magnitiidaand direction the forces x, y, z acting throughone point o ;… … Y = R . cos j8.z = R . cos 7. R= A/X2 + Y- + Z2X = R . COS a. 4. To find the resultant of any nuniher of forces acting throughone point in different directions and not in the same plane. Let P, P], p.,, ^Ncc, he the forces a, /3,7; Oj, jS,, 7, ; a,, 3,, 70, theangles their directions make uith…
