A practical course in mechanical drawing for individual study and shop classes, trade and high schools (1912)
Willard, William Franklin, 1879- · Chicago : Popular mechanics company · leaf 125
122 A PRACTICAL COURSE IN orthographically, make 30° to the horizontal in theisometric construction. c. Non-isometric lines of edges making other thanright angles must be laid ofif orthographically first andthen transferred to the isometric drawing. This dis-torts the true length of non-isometric… … Fig. 127 d. Surfaces, not lying in the same plane, are estab-lished from center-isometric axes. e. Isometric circles are drawn within isometricsquares of the same diameter as the given circle.Elliptic or irregular curves are constructed flat, thentransferred. Fig. 126. MECHANICAL DRAWING 123
Mechanical drawing
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