The Sciopticon manual : explaining lantern projections in general, and the Sciopticon apparatus in particular, including magic lantern attachments, experiments, novelties, colored and photo-transparencies, mechanical movements, etc. (1877)
Marcy, L. J. (Lorenzo J.) · Philadelphia : J.A. Moore · leaf 323
6 Unframed Slides. The Unframed Slides used in this country are mostly 3} inches high and 4 or A\ inches from side to side. The pic- ture openings, however, differ both as to size and shape. The common round opening is necessarily somewhat less than 21 inches in diameter, showing considerably less… … whose diameter is Zi inches where most needed. The cres- cent of sky and foreground thus cut from the enlarged picture is scarcely a disadvantage to most subjects, while there is an advantage in showing the full height of what is near the side margins. We endeavor, therefore, to have all our…
Lantern projection · Slides (Photography)
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
