The Optical Magic Lantern Journal (June 1896)

108 a block of wood, such as is’used for paving the streets ; the bones in the arm are clearly discernible through the flesh and clothing, and the motions of the bones in the wrist, hand, and arm can he studied with ease."’ 20: Patent Intelligence. The following list, relating to current Patent Applications, is compiled expressly for ‘‘The Optical Magic Lantern Journal"’ by a registered Patent Agent. For further information apply to The Patent Department, ‘ Optical Magic Lantern Journal,” 9, Carthusian Street, London, EC. No. Recent PATENT APPLICATIONS. 8418. 21st April, 1896. J. Bonn. Improvements in connection with the projection of photographs of animated subjects. 8663. 24th April, 1896. W. White. Improvementsin apparatus for producing and viewing colour photographs. 9890. 9th May, 1896. W. Hunt and J. Trotter. Improvements in kinographic and kinoscopic apparatus, and in obtaining naturally coloured effects therewith. RECENTLY-PRINTED SPECIFICATIONS. Copies of the following specifications may be obtained by remitting I|for each specification to The Patent Department, ‘ Optical Magic Lantern Journal,” 9, Carthusian Street, London, E.C. 7656 of 1895. Allen. Optical lanterns. 7749 of 1895. Baird. Adjustable stercoscope. 11039 of 1895. Humes. Gas compressors. 9881 of 1895. Justice (Hough). Obtaining from pictures the appearance of movement. Hepworth. Arclamp for projection, etc., purposes. Willway. Ether saturator. 11892 of 1895. 11966 of 1895, :0: Editorial Table. THe Year Boox or Puorocraruy (London: The Photographic News), 1s.—This annual, which has now been running for thirty-seven years, has come out this yearin an entirely new style of dress, and has assumed a brighter aspect than it has done in the past. It contains some excellent articles, and a host of general hints consisting of facts and formule, which have been compiled by Mr. E. J. Wall, F.R.P.S. — 0 —— Correspondence. OIL LAMPS. To the Editor. Srr,—In anawer to your correspondent, Mr. W. Stocks, the article in question was not written hastily ; on the contrary, I think it is he who has read it hastily, or he would have noticed that the remarks as to tilting a lamp swinging on gudgeons did not refer to lamps of the edgewick class at all. I am quite aware that a partiallyfilled tank can be tilted a certain extent without spilling oil, and an empty one inverted with the same result, but The Optical Magic Lantern Journal and Photographic Enlarger. I think the usual practice of lamp users is to fill a tank to the top or nearly so. The answer to Mr. Stocks’ final question is that no ordinary lamp can be placed sufficiently close to a long focus condenser in any ordinary lantern without alteration either to the lamp, lantern, or both. In conclusion, I must enter a protest against a tendency, which appears to be growing in certain quarters, to treat as personal attacks, communications from those like myself who wish to see improvements in various classes of lantern apparatus. Of course, if the lamps we have at present cannot be improved upon, so much the worse for the makers, as they will eventually be superseded by newer and simpler illuminants such as acetylene. Yours truly, THE WRITER OF THE ARTICLE. 20: Notes and Queries. Nontgen Rays.—By giving a short exposure the flesh of the finger will, as well as the bone, be visible, but by a prolonged exposure the flesh becomes less distinct. S.C. R. aske:—If it is possible to burn acetylene ina Bunsen’s burner, and thus use it for heating purposes instead of for lighting? Ans.—In the course of experiments we tried this, but failed to get it to light at the top of the tube admitting the air, the gas in every instance fired back to its outlet, and burned there, and no amount of careful turning up or down, or careful lighting would give us any other results. Ernest Eade.—We fail to see where the patent comes in. Arthur Hartley asks:—Can you give the readers full particulars with drawings in next journal as to how to make a camera for obtaining say a dozen exposures a second, a method of developing the pictures and making transparencies from same, and also how to construct a lantern to show those effects on the screen after the style of whatis called ‘‘living photographs ?"" Reply.— We regret we are at present unable to ‘fill the order,” but in a short time may possibly be able to do so. S. L. Wilton.—(1) You will find it advantagcous to use a mixed jet. (2) Use automatic regulators on the cylinders, and turn the valve full on; then adjust the light by means of the taps at the jet, not the bye-pass as you suggest. (3) If you use the “‘ Injector "' or ‘‘ Bjector’ jets you can use hydrogen from the house main. (4) The bye-pass allows a small quantity of gas to reach the jet, sufficient to maintain a small flame when the dissolver cuts off the supply. Albert Tranter.—In our next. B. R.—Give a longer exposure (re X rays), and it will have a tendency to make the flesh portion of the finger less apparent. W. H. Mathieson.—The back numbers have been sent. Acetylene will not rival the limelight, but for your purpose, as you use the oil light, will be a step in the right direction. We cannot say whether calcium carbide is at present procurable in New Zealand. In England the price of same is gradually coming down, and you will observe an advertisement in this issue quoting it at Gd. per pound. A. H. Saunders.—We quite forgot to call on you during our visit to Birmingham a few weeks ago. Several replies have been held over for want of space.