Perspective and geometrical drawing adapted to the use of candidates for second and third-class teachers' certificates . uired. Now, since AE = AC, E is 6 to right and 4witliin ; but ED = AB, then ED is 4 within , Shigh, and 6 to right. (Fig. 10.) Example 2.—Draw a line 3 long lying on , parallel (or base line), and 4 within it^ near extremity of linebeing T to left. H = 6, = 4^ scale I = 1. LMP HL w BMP •s A 1 \ ^^./ / 1 \ / 7 / BL \ , / / ^^ / \ ^ [i Q E ?^ f 5P Draw , and as before, and find also O mark off OB = 2 (distance of near extre
Perspective and geometrical drawing adapted to the use of candidates for second and third-class teachers' certificates . uired. Now, since AE = AC, E is 6 to right and 4witliin ; but ED = AB, then ED is 4 within , Shigh, and 6 to right. (Fig. 10.) Example 2.—Draw a line 3 long lying on , parallel (or base line), and 4 within it^ near extremity of linebeing T to left. H = 6, = 4^ scale I = 1. LMP HL w BMP •s A 1 \ ^^./ / 1 \ / 7 / BL \ , / / ^^ / \ ^ [i Q E ?^ f 5P Draw , and as before, and find also O mark off OB = 2 (distance of near extremity from O),and make BA=3 (length of line); join B and A B measure off BE = 4 (distance within ,)^ joinE LMP, cutting B in D; through D draw DC to lineIk. and parallel to AB. CD is line required, for it isequal to AB, and its near extremity D is same distance tothe left that B is, and BE = BD. (Fig. 11.) Example 3.—Draw a line 3 in length lying on , per- THE LINE. 25 pendicular to (base line), 4 to R., and nearest extremity2 within H = 6, = 4, scale \; = T. RMP. Draw , , , as before, and mark point OC = 4, join C C. Y. From C measure off CB = 2^, andfrom B mark off BA=3 (length of line) ; join B RMP andA RMP, to cut C in E, D. ED is the line required, forDE is parallel to LD, and therefore perpendicular to = BC and DC = AC, then DE = AB, and point E is thesame distance from that C is. (Fig. 12.) Example Jf.—Draw a line 3^ in length parallel to and4 within it, and parallel to , and 4 above it, line tobe drawn with near extremity 2 to left. 11 = 6, LD = 4,scale :i = r. In fig. 13 draw , and , and find LMP,take B 2 to left and A 4 to left of B, also S 4 to right ofB. Erect AC and BD perpendiculars to AB, and each 4 inheight; join CD, C , D , B , and S LMP. LetS LMP cut B C. Y. in G; draw GF parallel to BD, and FE3 26 DRAWING. parallel to CD : then EF is line
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Keywords: ., bookcentury1800, booksubjectgeometricald, booksubjectperspective
