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 341
h a horizontal line inclined to the Y.P.loill make with a given plane. Fig. 135. Let H.T. and Y.T. be the tracesof the given plane, and ah and ahthe projections of the line. Draw the projections of any lineAC, as ac, ac, at right angles to thetraces of the plane. Through c drawthe line cd… … XXVI LINES INCLINED TO PLANES 321 point c would always be in a plane perpendicular to the linepassing through cd. If we were to rotate this line ac till itbecame horizontal, we should not only obtain its true length,but also the angle it forms with ab. To obtain the true lengthof ac, draw cQ…
Geometrical drawing
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