The Optical Magic Lantern Journal (January 1896)

2 The Optical Magic Lantern Journal and Photographic Enlarger. Among other exhibits, Messrs. Noakes & Son had a fine exhibition of lanterns, which, as may be expected, was greatly admired. * * % “ Srupigs from Prison Life” is a set of slides which bids fair to have a prolonged and interesting career. As stated in our last issue, it made its début at a dual lecture (the first of its kind ever given) at Highbury and Soho. On the 11th ult. a large audience at the Chelsea Baptist Chapel was, under the fostering care of Mr. W. H. Grove, of Brompton Road, §S.W. initiated into the mysteries of a life which, doubtless, they never hope to experience. * i i SEEING that there is a growing interest in science in connection with soirées and evening parties, Mr. Carnall, of 40, Gladstone Buildings, Willow Street, E.C., announces that, in addition to the lantern, he is also prepared to supply the microscope and suitable slides. Mr. Carnall is a microscopist of many years standing, and when an audience have both microscope at hand, they can rely on having a very interesting and instiuctive entertainment. * * * laugh. Many of these find their way into the W.P.B., but as one facetious individual appeared to be very anxious to see his attempt at humour in type, we will oblige him in this instance. He writes:—‘ Will nitrous oxide (laughing gas) act as a substitute for oxygen in the limelight ? Will it be a better light than oil, and be cheaper than oxygen? What would be the effect (if used) on the audience—supposing a view of a cemetery was projected, would the | audience roar with laughter ?”’ at % b WirtH reference to our remarks in November Journal about a New York company having purchased the business of the Boston Camera Company, the makers of the Bull’s-eye Cameras, The European Blair Camera Co. write us that the transaction does not in any way affect their business, as they will continue to supply the now popular Bull’s-eye Cameras and Cartridges of improved model, and that the word ‘« Bull’s-eye ” being their registered trade mark, no camera other than their own make can be sold in Great Britain under that name. F * % ABoUT a year ago Messrs. Cook, of travel fame, adopted the plan of lending, free of cost, to anyone joining their parties, and who wished to give a descriptive lecture of places visited, a him and his : | did style. set of slides illustrative of the places of interest visited. Up to the present they have lent between two and three thousand slides. * * * Tue other day at Klausthal, in Germany, lightning struck the wooden post of a house and fused two nails four millimetres thick. Messrs. Siemens and Halske, of Berlin, afterwards carried on a series of experiments to ascertain the force required to melt this quantity of iron. Assuming one second as the time standard, it required a current of 200 amperes and 20,000 volts. representing 7,000 horse-power. If the lightning occupied onetenth of a second to fuse the two nails, the horse-power required would be 70,000. THE well-known wholesale firm of opticians Joseph Levi & Co. (‘* Leviathan, London”), who have occupied premises at 40, Furnival Street, | E.C., for over thirty years, will, by the time this journal is published, be in their new premises at 97, Hatton Garden, E.C. The new premises are large, and are fitted up in a splenThere are two immense show fioors.. besides clerks’ offices, private offices, and stock . . . ' rooms. We have been invited to a minute inspecSome of the questions received from correspondents would make the proverbial Cheshire cat | tion of the premises as soon as everything is in apnle-pie order. -——!0:—— Testing Limelight Jets. THE outcome of the challenge which was inserted in our pages soine time ago by Mr. Pringle, and which was accepted in order to ascertain whether Mr. Pringle’s jet gave a more powerful light than his competitors, culminated in a trial of strength at the Photographic Club recently. The intensity of the various lights was determined with care by umpires of repute : but like many other trials of strength, it ended in what may be termed a word-war amony many of those present. One thought he did not have sufficient indulgence; another, that his name had been left out; another again, found fault with the construction of the meaning of certain questions he asked, saying he meant j; one thing, whilst others evidently thought he meant something else. Anyhow, seeing that various sized nipples were used, thus causing various proportions of gas to be used, varying from 5 to 20 feet per hour, it was no easy matter to determine which was in reality the best. If the trial was to determine which jet produced the greatest amount of light, irrespective of any conditions, then it was a simple matter; but in order to arrive correctly at the