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viii, The Optical Magic Lantern Journal and Photographic Enlarger.
IF YOU WISH TO KNOW
1.—What focus of leus is required to produce a certain size of disc, at a given distance ;
2.—What size of disc can be produced by a Jens of ziven focus at a stated distance ;
3.—What distance a lantern must be from the screea to produce a certain sized disc with a lens of
given focus ; SEND 2:d. FOR A
Ready Reference Table
(On Cardboard) By J. HAY TAYLOR,
FASTEN IT ON THE LID OF LANTERN BOX.
TAYLOR BROS., 56, Chancery Lane, London, W.C.
to his own interests who, being a Lanternist, fails to possess himself of a Gopy of the FIFTH EDITION of
3/6 THE BOOK OF THE LANTERN. 3/6
By TT. Cc HEPWORTH, FE.C.8S.
It is a book of 300 pages, contains nearly One Hindred Illustrations, and is the only work which gives reliable directions for COLOURING LANTERN SLIDES.
FIFTH EDITION JUST ISSUED. Published by HAZELL, WATSON, & VINEY; and to be had of all Booksellers.
The prices of the Back Numbers of the Optical Mayic Lantern Journal are at present as follows :— Postage extra.
Vol. No. Vol. No. Vol. No. Vol. No.
1..1 June 1889 2/6 1... 10 March 1890 Id. 2...19 Dec. 1890 1d. 2... 28 Sept. 1891 2/6. 1.,2 July 0 1/1 ss. UL April vx od 2... 20 Jan. 1891 9d. 2... 29 Oct. » 9d. 1..3 Aug 4 Ij} 1..12May = ,, ld. | 2..21 Feb. ,, Id. | 2/.30Nov. 7 94, 1..4 Sept. i 1/2 .. 13 June » Ad. 2... 22 March ,, 1d. 2... 31 Dec. » 3d. 1..5 Oct. » Id | 2..14duly 4, Id { 2... 23 April |) oa. | 3.1) 32 Jan. 1862 94. 1..6 Nov. » Id. 2... 15 Aug. » Id. 2... 24 May » 6d. 3 .. 33 Feb. » 6d, 1..7 Dec. » Id. 2... 16 Sep. » dd. 2... 25 June » Id. 3... 34 March ,,_ 1/. 1..8 Jan. 1890 1d, 2.. 17 Oct. wx id. 2... 26 July » 6d. 3 .. 35 April » 6d, 1..9 Feb 4 Id. |] 2.,18Nov. ,, Id] 2.. 97 Aug. 5, 34. | 32.36 May 7” 3a"
No. 37 & up to Date td.. (Except No. 42, 1/-).