Essentials of drafting; a text and problem book for apprentice, trade and evening technical schools (1918)
Svensen, Carl L. (Carl Lars), 1884- · New York, D. Van Nostrand company · leaf 151
4, where the lines are drawn perpendicularto the points of tangency of the circumscribing square. The 134 ESSENTIALS OF DRAFTING intersections of these perpendiculars locate the centers for circulararcs which will approximate the ellipse sufficiently close for mostpurposes. In the figure TiT2TzT^ =… … F/g. 3/e The same construction is used for arcs of circles as shown inFig. 315. The interior of objects may be shown by means of isometricsectional views, Fig. 316 and Fig. 317, which are constructed by
Mechanical drawing
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