Spanton, J. Humphrey (John Humphrey) · London, Macmillan and Co., Limited; New York, The Macmillan Company · leaf 185
them as shown. This isthe elevation of the section. To construct the true shapeof the section, we rotate theplan abcdef on the H.T. Frome draw the line eg parallel tothe H.T., and equal in lengthto the height of ^above XY. Draw lines from each ofthe points in the plan at rightangles to the H.T.:… … Fig. 303. 172 GEOMETRICAL DRAWING AND DESIGN. The student should observe that the Hue JiK is the truelength of the line he. A simpler method of obtaining thelength of these lines is as follows. Note.—The true length of a projected Hne is equal to thehypotenuse of a right-angled triangle, the base…
Geometrical drawing · Design · Drawing
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