The Optical Magic Lantern Journal (January 1900)

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The Optical Magic Lantern Journal and Photographic Enlarger. xill. QPP 22 22.2.2 2.2.2, 2.9,9,9.9.9,9,9,9,9.9 9.0 0 ie 3e3i sESESESE ESESESERESORESEAOZESESEROSesOSeSEIOSE — IF YOU WISH TO KNOW 1,—What focus of lens is required to produce a certain size of disc, at a given distance ; 2.—What size of disc can be produced by a lens of given focus at a stated distance ; 3.—What distance a lantern must be from the screen to produce a certain sized disc with a lens of given focus ; SEND 23d. FOR A Ready Reference Table (On Cardboard) By J. HAY TAYLOR. FASTEN IT ON THE LID OF LANTERN BOX. MAGIC LANTERN JOURNAL COMPANY, LTD., 9, CARTHUSIAN STREET, LONDON, E.C.