Spanton, J. Humphrey (John Humphrey) · London, Macmillan and Co., Limited; New York, The Macmillan Company · leaf 182
7i tangential to the semicircle y^^;i.e. the base of the horizontal semi-cone. From b draw the line bln tangential to the semicircle Ikh \i.e. the base of the vertical semi-cone. Then a7n is the H.T. and bm the V.T. required. i68 GEOMETRICAL DRAWING AND DESIGN. Fig. 300 is a perspective view… … Fig. 300. to the plane required, and then drawing the traces at rightangles to these projections. This will be more easily understoodby referring to the set-square B (Fig. 298). Let Op represent a line at right angles to on\ and perpen-dicular to the plane B. Then op is the horizontal…
Geometrical drawing · Design · Drawing
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