The Optical Magic Lantern Journal (December 1900)

166 The Optical Magic Lantern Journal and Photographic Enlarger. the position of the sprocket wheels with relation to the mask, which is thus enabled to be stationary. In this manner the exact framing of the pictures can be assured quickly and without trouble, even whilst the machine is running. APPARATUS IN CONNECTION WITH ACETYLENE LIGHTING. Those who patronise the acetylene light in its varied forms will doubtless be glad to know that Mr. R. J. Moss, of 98, Snow Hill, Birmingham, can supply them with any generator or fitting that has been placed upon the market, his business being that of an expert and dealer in acetylene fixtures. Those who may have difficulties in this direction will do well to consult him, as he has had an extended and varied experience in this special branch. Several inventions of his own, including a_ special generator and burner, have met with great success, but he has broad ideas and is in a position to supply any acetylene apparatus on the market according to the requirements of his customers. His opinion in such matters is of great value. SLIDES OF THIBET AND NEW GUINEA. The new firm of Sanders and Crowhurst, 71, Shaftesbury Avenue, W., has obtained from the well-known publishers, Fisher, Unwin & Co., the sole right for making lantern slides from the original negatives which were used in making the illustrations in the popular works, “ Through Unknown Thibet,” and also “ Through New Guinea.” These illustrations are full of interest, and should command a ready sale. The same firm has brought out a slide which is of interest bearing the inscription, ‘ Old Stay-at-home,” together with a well lighted photograph of a half-crown piece. This slide forms a good counterpart to the slide sometime ago introduced by Messrs. York & Son, containing a photograph of a threepenny piece with ‘A Regular Church-goer’ printed around it. MECHANICAL EFFECT SLIDES. There is a charm in watching the general effect of good mechanical slides, especially when they emanate from one who is an authority in producing such. Some of the new effects introduced by Mr. Edmund H. Wilkie, 114, Maygrove Road, West Hampstead, N.W., are almost beyond description. We will, however, endeavour to give some details of two. THE HIDDEN TERROK.—Submarine warfare—Dawn on the ocean with a small ironclad in the distance, on the right side of the picture the submarine boat enters floating half submerged, On reaching the centre of the picture they sight the ironclad (which grows slowly more definite by special movement) and the submarine boat sinks below the water, leaving only the tops of the conning towers visible above the surface. Going in chase of the ironclad it is gradually lost to sight in the obscurity of the depths of the ocean. The picture then suddenly changes, a terrific explosion fills the centre of view, which passing off discloses the ironclad on its ; beam ends about to plunge into the abyss below, the result of the explosion being seen in clouds of smoke, steam, and sparks. Tur Granp InLuMINAtiIoNs OF THE CHATEAU D' Eau Panis, 1900.—The builting by day changing to night with the outlines defined by coloured electric lamps, the stone being tinted by their soft glow. Fountains in the foreground are seen to play, the water rising and falling while continually changing colour. The great veil of watcr from centre of building is seen falling, while miniature cascades are in motion from the many basins, with grand chromatic effects. DOUBLE WEIGHT VELOX. Velox paper is capable of yielding beautiful prints, and that known as double weight requires no mounting, the emulsion being coated on substantial cardboard. Exposures may be made either by daylight or by the light of an ordinary lamp or gas. In order to obtain the correct exposure, it is well to use a small piece of paper as atest, for when printed no image can be seen until after development. The developer recommended by the sole British agents, Messrs. Griffin & Son, of Sardinia Street, W.C., is as follows :— WG OR Sis tered 02 acd ceeranuratahegedtted canara aa buadte 10 ounces. Me tolovcss deccancas Gia ata Peete dea duatacts 7 grains. Sodium Sulphite, crystals, pure ........ $ ounce. Hydroquinone ...............2.....0030 grains. Sodium Carbonate, desiccated .......... 200 grains. (or 400 grains of crystallised carbonate.) 10°/, Bromide of Potassium solution, about 10 drops. Novz.—In England, Canada, or wherever the “ British Pharmacopeia "' is official, use 150 grains of the desiccated Sod. Carb. This developer can, if desired, be applied to the prints with a brush while the print lies face upwards on a piece of glass plate. After development is complete the prints should be dipped into clean water for a second or two and immersed in the following fixing bath, after which they should be washed in running water for about an hour. Hy POssic.2sded cc be aeee ac eheee ayes 16 ounces. Water i.ccceaaceeicecce sei bie anes starareccianca 64 ounces. Then add the following hardeving solution : Weber: scieauecicure seams ad es e-enveds 5 ounces. Sodium Sulphite Crystals .............. % ounce. Commercial Acetic Acid (containing 25% PULE ACId) cl ceeaeeneddseanes veeees 3 ounces. Powdered Alum .............. 0.00 eeeeee $ ounce. With the hardening solution this mixture’ keeps perfectly clear and can be made up at any time in advance.