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 31
21 SCIOPTICON MANUAL. action of the crystalline lens and the vitreous and aqueous humors. As the retina, RR R (JFig. 11), is con¬ cave, the centre of concavity being the optical centre, there is no need of adjusting the focus to a flat field. … These five troublesome properties enumerated in this chapter, are thus, in the eye, harmoniously reconciled. In art we lack the peculiar crystalline lens, and the con¬ cavity of field. Making amends for this lack interferes with other corrections. Efforts of various makers to effect the best…
Lantern projection · Slides (Photography)
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
