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., author · Philadelphia : L.J. Marcy · leaf 28
hat the marginal rays of the field of view strike the lens under a larger angle than the central rays, and consequently suffer a greater refraction. Of the simple form Of lenses, the meniscus, with its concave side to the object, shows it the least. But it is best overcome by a combination of… … When the ground-glass is placed at a a, only the central part will appear sharp ; when at b b, only the points of the arrow will appear well defined. This error is avoided by combination of lenses with suitable curves, and by stops.
Lantern projection · Slides (Photography)
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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