Science and art drawing : complete geometrical course ; consisting of plane and solid geometry, orthographic and isometric projection, projection of shadow's the principles of map projection, graphic arithmetic and graphic statics (1895)
Spanton, J. Humphrey (John Humphrey) · London : Macmillan · leaf 337
Q, Ijotli ofwhich are inclined to each of the co-ordinate planes, hut inopposite directions, their traces heing given. Pig. 129. Let P and P, Q and Q, be the traces of the two planes Pand Q. Pind the pro-jections ah and ah of Vthe line of intersectionbetween the two planes(Prob. 92). Through any… … Fio;. 129, XXV ANGLES BETWEEN PLANES WHICH ARE NOT PARALLEL 317 From / draw fn perpendicular to cb. From c along cib setoff ek equal to fn. Join Icli and lig. Then likg is the anglebetween the two planes P and Q required. likg is a triangle with an altitude equal to fit!, rotated on theline lig…
Geometrical drawing
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