The Optical Magic Lantern Journal (July 1891)

The Optical Mazio Lantern Journal and Photographic Enlargor. 127 Hand-Cameras for Obtaining Slides for the Lantern. ** Facile’ ss. . (Fallowfield)... ww. see March Ist, 1890. No.1 “Giah" ... ... (Mawson & Son) 6 5, May Ist, 4, » 2“ Quadrane” ... (W.H. Humphries & Co.) ,, June Ist, ,, » 3 ' Eclipse we (J. PF. Shew & Co.) ee yy) July Ist, 4, » 4 Eureka” . (WLW. Rouch & Co)... 5, Aug. Ist, ,, wn 5 Key” ., . (Platinotype Co.) ... «5, Sept. Ist, 4, 6 “Opcmus ... (Perken, Son & Rayment) ,, Oct. Ist, ,, 7 The Griffin’ (Griffin & Sons, Limited Nov. Ist, 4, » S ‘The Swinden-Earp” Patent we a, Dec. Ast, ,. » 9 Collins" (C. G. Coilins) 1, Feb. Ist, 1891. » 10" Kodak" » (Eastman Co.) .. 4, Mar. Jee, yy » 11 “ Guinea” . (Walter Griffith) ... we gg April Isen 4, y 22 Vanneck " (Watson & Sons)... » oa May Ist, 4, w 13 Chadwicks " (1. W. Chadwick) x» June ls, ,, No. 1y.— BONANZA.” THIS camera is of the automatic magazine class» and is the invention of Messrs. R. and A. J. Mercer, 16, King Street, Birmingham, whoare also the manufacturers. This instrument is made of ebonized mahogany, and holds twelve quarter plates, and measures S by 6 by rosin. Each plate is placed in mapa iE hi i i II a frame carrier, a zinc backing being also inserted to prevent light penetrating. These carriers are placed in the end of the camera into a hinged box, which is detachable. After the lust plate is in, a spring is inserted which keeps the front plate in correct focal register. The method of changing the platesis very ingenious: a quarter turn is given to a button at the side, which causes the plate box spoken of to hinge forward. The plates now lie in a horizontal position; the front plate is retained in its place by a novel catch, but when it is raised, or more correctly speaking, pushed forward (when in the horizontal position), a half an inch it immediately detaches itself, and the next plate being pressed by the spring immediately takes the place of the first. This detaching of the plate is effected by a small knob, situated below that which causes the plate box to hinge. The exposed plate now being free, it at once drops into a reservoir at the bottom of the camera. When the piate chamber is in position for exposing, a knob on the top of the camera insures its being kept absolutely upright. The lenses provided with this camera are, according to price either rectilinear or single achromatic. The Thornton-Pickard roller blind shutter is fitted to the camera. This popular form of shutter is admirably adapted for work of every class, as it can be regulated from slow to high speed. A safety shutter behind the lens, and a sunk finder are also provided. My Experience with the OxyEther Light and Scott’s Benzoline Saturator. By E. H. STEVENSON, NORWICH. In 1887 I found it necessary to use the limelight for my public illustrated lectures. I had not hitherto used it, and consequently was at a loss to know which form to take up; after much inquiry I determined to try the oxy-ether. For three seasons, night after night, under every conceivable circumstance, I have used it at drawing-room entertainments, where we have had select audiences of about a dozen or so: to an openair entertainment where | have had an audience of over five thousand ; in winter and in summer, indoors and out, never has it been anything but thoroughly satisfactory. and I have never had a hitch. 1 have used it with various jets, with gasbags, and also with cylinders; but always with a single lantern, for I very much prefer asingle lantern. For several reasons I have used a special form of the patent porous saturators. About twelve monthsago I thought 1 would try Scott’s Saturators. First I tried the cold, this! did not find very satisfactory. If I were to tell youall my experience with the warm-bath saturator I should occupy too much of your valuable space. At the first public lecture I gave with it my light went out with a bang fourteen times! However, I determined not to give it up without a further trial, and I wrote to Mr. Scott, and after having received his answer I tried again, and -was very pleased with the result ; and all through this season I have used it with very grand results. A customer of mine, to whom I supplied the apparatus, has also used it for advertising purposes every night for three months ; the disc has been much brighter than it could possibly have been with any other form of limelight, and the public have been able to read the advertisements at a distance of one-third of a mile. Let me give one word of advice to all who use saturators of any kind. Never attempt to light up a second time until you have disconnected your tubes and blown through them. 10% A Mixing Jet—Oxygen from Bottle and Hydrogen (House Gas) from the Main. By ANDREW PRINGLE, IN the issue of June 1, I see under “Notes and Queries” a reply to a correspondent (Mr. W. Vicarey) about my way of using a mixing Jet with hydrogen from the main. Nothing would be more grievous to me than that an accident should befall any lanternist through following instructions given by me, and, therefore, I venture to address a few words for the benefit of our readers. I have for years employed the arrangement alluded to by the correspondent, and I have used it, as I may say, constantly. My gas is often lighted for a whole day. my “cut-off” arrangement being employed to prevent waste of gas. I take oxygen from a cylinder