The works of John Ruskin . s 3ShO 43 & £W o c 3 O a. 0 H 0173 a 3 3 u ^> 03C(1) o RUDIMENTARY SERIES: INSTRUCTIONS 251 the semicircle (to draw your semicircle with the edge of alarge bowl, and stretch the chain all round the edge, andthen take half that length, is a short, rough way). Thenset your drawing-board as upright as it will stand, pinyour paper on it so that the diameter a b may be quitelevel, and pin your semicircle length of chain at its endsto the points a and B, so that it may hang down betweenthem. It will hang in the line a b r>. Trace a pencil linedelicately beside it,
The works of John Ruskin . s 3ShO 43 & £W o c 3 O a. 0 H 0173 a 3 3 u ^> 03C(1) o RUDIMENTARY SERIES: INSTRUCTIONS 251 the semicircle (to draw your semicircle with the edge of alarge bowl, and stretch the chain all round the edge, andthen take half that length, is a short, rough way). Thenset your drawing-board as upright as it will stand, pinyour paper on it so that the diameter a b may be quitelevel, and pin your semicircle length of chain at its endsto the points a and B, so that it may hang down betweenthem. It will hang in the line a b r>. Trace a pencil linedelicately beside it, not disturbing the chain, draw over thepencil with your brush, and you have the first simple rela-tion of the catenary to the circle. Next, with the length of the diameter a b in Fig. 10for a radius, draw the semicircle c d (Fig. 11, R. 4), andhere in margin divide the whole semicircle into six equalparts by the points e f, etc., and then fasten one end ofyour semicircle of chain to the point a, and the other suc-cessively to e f b g h, and draw all
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherlondo, bookyear1903
