The Optical Magic Lantern Journal (December 1895)

220 suppose these must be act egainst the dissatisfaction of thore who have complained to you, who, by the way, you very rightly advise to express their views either to the hon. seo., or at one of the meetings, for the Council always welcomes suggestions from any of its members. Yours faithfully, J.J. VEZEY. Ohairman, Lantern Society. "188, Lewisham High-road, S.E. November 9th, 1895. [We are always glad to see improvements in the Rociety, but at the same time we give conscientious answers to correspondents—hence the replies in ‘‘ Notes and Queries.” e have sent your enclosure to the wut of the article, and received the following reply.— D.) | To the Editor. ewe. (In answer to Mr, J. J. VEZEy ) Drar Sir,—The burners referred to are identical with Duke's Patent. Whilst saying how they are made, the burners sold by myself are Duke's, and I believe anyone can make sed patented article for their own use. No serious trouble can come to the seller of the original article. As to my correspondent’s experience with same, I must agree that Duke’s are not yet perfect, the platinum wire being too fine. With a slightly coarser wire they are much less liable to shift or bend, as [ have found from my own experience, being in use continually for three months at a time without failure. Now, on this subject, I muat say that the self-lighters are more efficient if protected from draughts by a globe or similar covering; otherwise, the action of the gas passing from the nipple of the burner is liable to be blown on one side, and the heating of the porous plug takes so much longer: Thanking Mr. Vezey for drawiug attention to the matter, Believe me, yours respectfully, A LANTERNISL. ——:0:—— Notes and Queries H. J. Field.—Write to Mr. E. Baruch Blaker, Boro’ Studio, Worthing. W. H. Young.—Unless you have great confidence in the persons to whom youintend showing the apparatus, we would suggest that you first obtain a provisional patent. J. F. Hammond.—1. You can back it as suggested, it is often done, and the result is a great improvement. 9, We cannot say that any one electric lamp is better than the others. You will find some excellent ones advertised in this Journal. 3. Yes, it is quite necessary to use a condenser with the electric light, the same optical system prevails as though you had an oil lamp. Gaa.—We cannot offer any opinion, but we received a letter a few days ago from a reader saying at that time he had a 6-feet cylinder containing 74 feet of gas; but that the compressors are very particular, we seein would suggest that hie‘ gauge was not quite what it should be. Kingsbury writes :—(1). With a blow-through jet is more or leas oxygen used than with a mixed jet? (2). Could a blow-through jet be used with the hydrogen supplied from a cylinder, instead of from the house The Optical Magic Lantern J ournal and Photographic Enlarger. main? (3). Can the ejector jet be used with two cylinders instead of house gas from the main? dné,— (i). Blow-through about 44 feet per hour, and mixed about 5 feet for the same time. (2). Yes, but be sure and keep it well under control, or you may find that it will soon be used up. (3). Yes. A. Freeman.—F rom particulars you supply about the particular jet becoming clogged up in the manner mentioned, certain qualities of hydrogen will cause thie, and if the jet is cleaned out but imperfectly, good gas when then used will help to form an accumulation. If, as you say, the gas you nowuse does not make another jet clog, we should think that there still remained some of the crust, and it will even then go on forming—there is nothing for it but to ensure the inside of the jet being absolutely clean, and great pains should be taken to ascertain that it is so. A. W. B. R.— The party evidently sayswhat he does, as it is a single and not a bi-unial lantern which he wished to dispose of, and evidently brings all the arguments to bear, to impress upon you that it is not a bi-unial but a single lantern you should get. Had hea bi-unia] instead of a single to dispose of, it is quite possible that he would argue in the opposite strain. T. H. Y.—Fasten a cord to each corner and pass through the pulleys and draw taut. You will find single cords along the poles better than lacing. T. W. Grant.—We fail to see what you mean by “the extra lens,” but if you place a rectangular prism in front of the lens that is all that is necessary. Ejecter—Yes you can use it with absolute safety. There is also an injector jet on the market. Explosions.—See reply to J. B. Colt & Co., and others. W. H. Young.—Thanks for photograph. And. Caird.—We have sent your letter and stamp for reply to the writer of the article. He will, doubtless, reply to you. J. C. White.—1. The numbers of journal you speak of are 1d. each, postage extra. 2. Writeto Mr. Chadwick, of Manchester, and he will send you particulars of his gasometer, &c. M. Derry.—1. Yes, Wood's jet is both good and safe: 2. From Mr. Brown, of Ossulston Street. See his advertisement. E. H. Stephenson.—We are supplied at present thanks. G. J. Rothwell and others.—Mr. Scott, the writer of the article died some months ago, and we know of no one who knows of the ingredients mentioned. The line about his supplying the varnish should have been taken out of the article. G. J. Rothwell.—1. Twist the wire round it. 2. A bath with a water jacket, then place in say a cup, which float in the hot water. J. A. Graham, J. B. Colt & Co. (New York), and others. —Shortly before going to press we had the opportunity of seeing the new oxygen producer at work for a few minutes only, but unless we tried it during a series of exhibitions to ascertain the effect of the chlorine upon the thin rubber bellows container, we cannot offer any definite opinion, but certainly the apparatus produces gas very quickly ; the gas goes direct from the tubular retort into the rubber bellows without the intervention of any wash bottle. For a single lantern a new cartridge has to be inserted every few minutes, and if the lantern operator is sufficiently adept he can see to this, but with a bi-unia) lantern, to ensure things running smoothly, it would be well to get a boy to push the cartridges in as required ; this, however, is quickly done and requires no experience. For a single light for two hours, about 25 cartridges are required, and this quantity the Company will supply for,about 28.