The book of the lantern : being a practical guide to the working of the optical (or magic) lantern : with full and precise directions for making and coloring lantern pictures (1889)
Hepworth, Thomas Cradock, -1905 · New York : E.L. Wilson · leaf 44
22 THE BOOK OF THE LANTERN. already pointed out. So the suggestion was made that a small lens should be interposed between the light and the condenser. This was done with a wonderful gain in the performance of the old lanterns. Fig. 14 will show how … Fig. 14. the additional lens brought this improvement about. Many- other forms of condensing lenses have from time to time been suggested and experimented with, some of these em- ploying three or more combinations. But these various patterns, although one or two of them seem very promising in form,…
Lantern projection
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
