Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 715
Fig. 1771. Fig.1772. 698 ISOMETRICAL DRAWING. In the application of this species of projection to curved lines, let A B(Fig. 1773) be the side of a cube with a circle inscribed; and all the faces of acube are to have similarly inscribed circles. Draw the diagonals A B, C D, andat their intersection… … Fig. 1773. Fig. 1774. draw the isometrical projection of the cube (Fig. 1774), and lay out on theseveral faces the diagonals and the parallels; the projection of the circle willbe an ellipse, of which the diagonals being the axes, their extremities are de-fined by their intersections /6, e 5, « 2,…
Mechanical drawing
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![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-122-336.webp)
![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-113-297.webp)
