The Optical Magic Lantern Journal (February 1897)

38 ‘The Optical Magic Lantern Journal and Photographic Enlarger. being enclosed suffices to take negatives, and a 4-volts motor is used for running the machine either when taking negatives or projecting. DUPLICATOR. Mr. W. Tylar, of Birmingham, is bringing out a cheap attachment whereby a person may be photographed in two different positions on one plate, or two people, say, sitting at opposite sides of a table, unbeknown to each other. The appliance consists of a box which fits-on to the lens, aud at the further end of which is a sliding division which shuts off half of the plate at a time. The exposure is made by means of the square wooden cap shown in the foreground. THE VIVISCOPE. By the name ‘ wheel of life,” the younger generation will probably locate a well-known scientific toy. The viviscope is a new and improved form for bringing about the effect of “Hes SNINISCOPE , ETOSCOR, > moving figures, and forms a useful present for a child, and will afford excellent amusement at juvenile parties. Bands of coloured pictures are placed in position, with the pictures facing a species of proscenium, and the handle (as shown in illustration) is turned. Life-like motion is given to the subject, as seen either through the opening or at the sides. This scientific toy, which is dealt in by Mr. G. Fowler, 70, Great Saffron Hill, London, E.C., is having the large sale which it certainly deserves. It is inexpensive, and supplies no end of amusement. orrespon dence. Oo -SS3S> 7S XS? ACETYLENE GAS BURNERS. : To the Editor. Desr Sir,—I note in your January issue an article by Mr. H. J. Walker, dealing with acetylene. Icordially agree with what he says about this illuminant, both for lantern and domestic use I consider it far and away the best light—taken all round—that has yet been discovered for general use. Naturally, I do not pretend that in lantern work it can come any where near the limelight, to say nothing of the electric light for brilliancy, but it certainly is the most convenient for amateurs. I also note the difficulty Mr. W. experiences with the burners, I have found the same complaint against the same type of burner fittings ; in fact, I did not pass the experimental stage with it. I not only found the difficulty he complains of, but also experienced a greater one in getting two burners exactly alike. I found that one—generally the front one—would roar, while the other did not give the light that it should have done, and if I turned down to stop the noise, the back one began to smoke in a very short time; this being most unsatisfactory I adopted the only course, which will, in my opinion, meet Mr. Walker's difficulty, viz., fitted each burner to a separate pipe, and each pipe with a separate tap. I now have no difficulty whatever, for though the pressure on the front burner is naturally the greater, it can be effectually controlled by its owntap. I shall be glad to give your correspondent any further information in my power. I have had thoughts of putting this burner on the market, and also a dissolving arrangement as soon as I can find time to perfect them, provided of course that I can get anyone to take them up. Yours sincerely, R. MOSS. JUBILEE PROPOSAL. To the Editor. Srrz,—As this will doubtless be a year of celebrations of all sorts and kinds, I venture to suggest to your readers that it would not be out of place if the many lanternists in the country were to make an humble attempt to commemorate the occasion by forming a set of slides illustrative of events and places connected with the life of our Queen and Country. I think such a set could be easily formed by your readers, and as easily despatched to some of the frontier townships and settlements of our distant colonies, where, passing from hand