Perspective and geometrical drawing adapted to the use of candidates for second and third-class teachers' certificates . Fr 60. horizontal line to left of We wi].. now proceed toascertain the positions of these points. Example 1.—Draw a square (side 4) lying on ground; sidesmake an angle of 45° with picture plane, and the angletouches the at a point 4 to the right; scale ^ =-\\ ANGULAR PERSPECTIVE. 99 Here draw and as before, and take at givendistance; then draw a straight line through parallel and on each side of ; lay off the sides at requir
Perspective and geometrical drawing adapted to the use of candidates for second and third-class teachers' certificates . Fr 60. horizontal line to left of We wi].. now proceed toascertain the positions of these points. Example 1.—Draw a square (side 4) lying on ground; sidesmake an angle of 45° with picture plane, and the angletouches the at a point 4 to the right; scale ^ =-\\ ANGULAR PERSPECTIVE. 99 Here draw and as before, and take at givendistance; then draw a straight line through parallel and on each side of ; lay off the sides at requiredangle (in this case 45°); produce these lines till they meetthe horizon in R and L (the vanishing points); withL as a centre, and as distance, describe an arc tocut in R MP.; similarly find L MP. These are calledmeasuring points. Now take A, 4 to right and draw A L A R ; take 4 on each side of A, namely, B and C,and draw B R MP and C L MP to cut vanishing lines in Eand D. Draw D L and E R to cut in E. ThenADEE will be the square required. Eor AD^ and f^E areparallel to R placed at given angle, and AE andDE are parallel to L also placed at given angle;and DE = AE = AB = 4^, and EE = AD = AC = 4\ (Eig. 61.) Example 2.—Draw a cube, edges 4, right face at an angleof 60° and left face at an angle of 30° with H = 6,L.
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Keywords: ., bookcentury1800, booksubjectgeometricald, booksubjectperspective
