Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 141
and a plan to express the form horizontally. 124 ORTHOGRAPHIC PROJECTION. Draw a horizontal line L T through the centre of the sheet to represent theground line. Then draw a perpendicular to the ground line, S S, to representthe axis of the pyramid. To construct the plan, from any point, S, on the… … be projected vertically upon the ground line. From each of the angles atA, B, C, and D erect perpendiculars to that line. The points of intersec-tion, A, B, 0, and D, are the true positions of all the angles of the base; andit only remains to lay off the height of the pyramid, from the point G- to…
Mechanical drawing
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