The Optical Magic Lantern Journal (October 1901)

The Optical Magic Lantern Journal and Photographic Enlarger. merely gave a smile and said, “As far as we are concerned that is a thing of the past—we do everything by electricity,” and we were then treated to a short lecture on switching on currents, etc. As a matter of fact, everything was done (except setting type) by electricity. ee Bod = X Ray Tubes.—Some time ago we announced that the Réntgen Society had offered a gold medal for the best practical X ray tube. At the annual meeting of the society this was awarded to Herr C. H. F. Muller, of Hamburg. The entries were five of British make, eight American, and fifteen German. The Muller tube which was awarded the medal is to retail for 183. 6d. a Exhibition of the Royal Photographic Society-—The forty-sixth annual exhibition of this society will be held at the New Gallery, 121, Regent Street, London, W., from September 30th to November 2nd. On the 28th ult. a conversazione and private view was given, to which many were invited by the president and members of the council. ~ m > ~ ~ Philadelphia Photographic Salon.—The exhibition of this society (fourth year) will be held from Nov. 18th to Dec. 14th at the Academy of Fine Arts, Broad St. (above Arch), Philadelphia, Penn., U.S.A. > & =~ 63 Photographic Salon.—The ninth annual : exhibition at’ the Dudley Gallery, Egyptian 22277 Hall, Piccadilly, opened on the 20th ult., and will continue until November 2nd. te ~ Appointment.—Messrs. Newton & Co., of 3, Fleet Street, have been appointed opticians to His Majesty the King. oe + The “G.W.W.”’ Slides.—The lantern slide department of Messrs. G. W. Wilson & Co., Litd., has been taken over by Messrs. Wilson Brothers, whose commodious premises at Loch Head House, Aberdeen, are well suited for this growing department. We understand that the management is as before, the processes and negatives used are the same, and the working staff remains unchanged. This ensures that <b f the high quality of the ““G.W.W.” slides will | be maintained. The Registration of a Lantern. yy NTERTAINMENTS of the dissolvying-view class have to an extent had to take a back seat for the past few seasons, but there are signs that betoken that this once popular style of entertainment will again come strongly to the fore. Many of the slides which were considered by our forefathers as being wonderful, high-class, etc., are by the present generation looked upon as vile daubs; the result of progression in matters pertaining to art. The new era of effect. slides will demand slides of the highest quality and style, and that they be presented upon the screen with unfailing exactness. Many bi-unial and triple lanterns at present on the market stand sadly in want of registration, by which is meant that the places where the slides are inserted should all bear the same relation to the centre of (say) the condenser. In a triple the base lines upon which each slide rests should be strictly parallel, but as very few are mathematically correct, methods have to be resorted to in order to make them so. For this purpose what is termed ‘‘runners”’ are used. These may be of various kinds, and rest on the pillars which keep the front and back of the stage together. Means should be provided for & raising either end of these runners slightly so that all the bases may be rendered absolutely : parallel to each other and consequently horizontal. Most makers of lanterns have their own particular style of runner, and as one form or other can be obtained from any dealer in lantern / goods the sketch herewith is not intended to show how a runner should be made, but to explain the principle. It will be seen that there should be movements for raising either end, screws to keep it in place when set, and also an end adjustable stop to retain the slide at the correct distance. This end stop should be capable of being folded down should occasion arise. Fach stage must, therefore, be provided with a runner which will fulfil all the requirements stated; this being done, it then becomes necessary to adjust them in precisely the same relation to their condensers. This is effected