A manual for teaching model-drawing : from solid forms, the models founded on those of M. Dupuis : combined with a popular view of perspective, and adapted to the elementary instruction of classes in schools and public institutions (1843)
Williams, J. Butler, Sir, Lowry, Joseph Wilson, 1803-1879 · London : J. W. Parker · leaf 72
PRINCIPLES OF PERSPECTIVE. 51 to the eye of one individual. Now, the rays of light conveying to the eye the image of this straight line proceed from every point of it, and may be said to … be innumerable. In endeavouring, therefore, to represent them by these straight threads passing from the right line to the supposed eye, we can make no approximation to their number. But even here we can simplify the illustration by omitting all the threads except those which proceed from the ends…
Drawing · Perspective
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
