Perspective and geometrical drawing adapted to the use of candidates for second and third-class teachers' certificates . legs form a square whose side is parallel to and 3within it. The centre of the table is 4 to right. Thicknessof neither table nor legs, taken into account. 16. Draw a set of four steps, each 4 x 1 x 1, ends parallelto and 2 within it; to be 5 to left, facing toward right. 17. Draw same, ends perpendicular to and 2 withinit, and 3 to right. 18. Draw same, with steps descending as they recede; backcoincident with and 2 to left. 19. Draw same, directly in fr
Perspective and geometrical drawing adapted to the use of candidates for second and third-class teachers' certificates . legs form a square whose side is parallel to and 3within it. The centre of the table is 4 to right. Thicknessof neither table nor legs, taken into account. 16. Draw a set of four steps, each 4 x 1 x 1, ends parallelto and 2 within it; to be 5 to left, facing toward right. 17. Draw same, ends perpendicular to and 2 withinit, and 3 to right. 18. Draw same, with steps descending as they recede; backcoincident with and 2 to left. 19. Draw same, directly in front, steps ascending as theyrecede, and 2 within 72 DRAWma. TThie Prism, Prisms are square, triangular, hexagonal, etc., according totheir ends or bases. The square prism may oe considerea as a mere modificationof the plinth. To draw a prism, we have only to draw the two surfacesforming its ends, and join similar angles. Example 1,—Draw a triangular (equilateral) prism, length6, side of base 2, lying on , one end perpendicular and 3 to left; prism to touch II = 6^ = 4,scale i = r. MP CV. Take B, 1 to left, A, 3 to left, and D, 6 to left of A. OnAB describe equilateral triangle ABC; draw CL | to A3 THE PRISM. 73 and bisecting it. Draw AE _[_ to AB and equal to CL; simi-larly draw DF; join F , E and A , also B MPand L MP; through M draw MG- parallel to AE, meetingE in G; draw GH parallel to EF; join HD, AG andGK, completing the prism. Then AK = AB - AC = BC == 2^Hence AG - KG = AK, and GM - E A = LC - required height,and HG = FE = DA = 6, etc. (Fig. 42.) Example 2,—Draw a hexagonal pri^m (edge of base 2)whose length shall be 4, one side touching 4^ to right;prism to stand on end. H = 6; = 4; scale, :| = 1.
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Keywords: ., bookcentury1800, booksubjectgeometricald, booksubjectperspective
