Science and art drawing : complete geometrical course ; consisting of plane and solid geometry, orthographic and isometric projection, projection of shadow's the principles of map projection, graphic arithmetic and graphic statics (1895)
Spanton, J. Humphrey (John Humphrey) · London : Macmillan · leaf 174
f thin card-board or stiff paper, and place it a shortdistance from a lighted candle ; this will form a cone of light(Fig. 282). If we place a plane—or a piece of paper pinnedto a drawing-board—so as to allow the light coming throughthe circular aperture to fall upon it, we can, by placing it inthe… … 4^ Fig. 282. In Fig. 282 the plane is parallel to the aperture, so thesection obtained is a circle.
Geometrical drawing
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