. Model drawing and shading from casts; a complete guide to the elementary and advanced examinations in these subjects; . st lesson, and do not leave thisexercise until you feel you can draw a cube or asquare prism in any position. Notice in the picturehow useful the diagonal lines on the surface of thecube are, the position of these will, of course, varywith the slope of the model, but these imaginary linesare of the greatest use in determining the all the sloping lines by comparing them withthe pencil held vertically. In the last four exerciseswhere the edges of the board a
. Model drawing and shading from casts; a complete guide to the elementary and advanced examinations in these subjects; . st lesson, and do not leave thisexercise until you feel you can draw a cube or asquare prism in any position. Notice in the picturehow useful the diagonal lines on the surface of thecube are, the position of these will, of course, varywith the slope of the model, but these imaginary linesare of the greatest use in determining the all the sloping lines by comparing them withthe pencil held vertically. In the last four exerciseswhere the edges of the board all retire, be careful tocopy the angle—made black in the pictures—whichthe two near edges of the board make with yourpencil held in a horizontal position at right-anglesto the direction in which you are looking. The octagonal prism is rather too difScult to beattempted yet, it is not now included in the syllabusfor the examinations, but some hints on the methodof drawing it will be found in the lesson on polygonalmodels. It is given here as a good illustration of theconvergence of ascending and descending
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherlondonchapmanandha
