The sciopticon manual. Explaining Marcy's new magic lantern, and light, including magic lantern optics, experiments, photographing and coloring slides, etc (1874)
Marcy, L. J · [Philadelphia] Sherman · leaf 26
ed by re- versing the lens, for spherical aberration is four times as great when the parallel rays enter its plane surface, as when they enter its convex surface. Much is gained by a combination of lenses so that the refracting angle may be less in each. "Were the mar- ginal rays d d cut off by a… … sharply on a square, A (Fig. 7) the resulting picture will not appear square, but barrel-shaped, as at B, When we
Lantern projection · Slides (Photography)
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
