The Optical Magic Lantern Journal (January 1896)

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16 The Optical Magic Lantern Journal and Photographic Enlarger. SELF-LIGHTING JETS, To the Editor. Si1r,—Allow me to call attention to an error in the illustration of self-lighting limelight jets, page 177. If placed as shown, the self-lighting attachment would in either case throw a very objectionable shadow upon the condenser. Underneath the nipple, or low down at the side, would be a far better position for it. The object of inclining the lime as shown, page 183, is that the nipple even shall cast no shadow upon the condenser. This is an excellent practice on the part of jet makers, and it is a pity it should not be more frequently adopted. Yours truly, G. HASTINGS PHILP. Weston-road, Gloucester: SQUARE LIMES, To the Editor. FF.Dean Srr,—With respect toithe’two letters which have ‘appeared on the above subject, I tried all shapes of limes, including a cube some time ago, and came to the conclusion that so long as we continue lime, that of the cylindrical shape is the best, but they could with better pm be imade of larzer diameter than those at present sold. Yours truly, EXPERIMENTED, O1L LIGHTS. To the Editor. Dear Sir,—Mr. Mathieson asks in last issue why we cannot have lantern lamps like the lamp he mentions, which is claimed to give 300 candle-power. I think I am not far wrong when I state that with domestic lamps the candle-power is calculated as it were all round. Thus, if a quarter of a circle represents 10 c.-p. the remaining §$ of the circle will give three other lots of c.-p. each of 10 c.-p., so that this is termed 40 c.-p.; but use this lamp in @ lantern with even a reflector and it will only give about 15 c.-p. Lamps are advertised for lanterns to give (under lantern conditions) 100 c.-p., but were such a lamp used domestically, with a glass chimney all round, it would be termed of about 400c.-p. Yours respectfully, RICHARD MORGAN, >O0:—— Notes and Queries. J.B.—The screws are too slack, that is all. Troubled One.—Depend upon it, the objective is at fault. Light.—If you like to publish it in the advertisement columns with your name and address attached it can go in, but it certainly will not in that portion for which we are liable. This is the third or fourth time you have written upon this subject; for goodness sake try some other paper, perhaps they may insert it. T, J. S.—It will appear in next, S. Walls—There are so many dealers and makers on the continent that it is impossible to give their names and addresses here, but you can obtain almost any of their slides through any importing London or provincial firm. John McPhee.—Use a powerful electric search light, and stencils as slides, and you will then get the desired effect. If clouds happen to be handy so much the better; failing this, you can project on anything that impedes, . providing the law does not intervene, as in the case of Nelson's column in London. Joseph Schien.—See reply to Mr. McPhee. Walter Walker.—Tf you ara sure you are clear as to the inlet and outlet pipes, and are using them correctly and then get the effect mentioned, we should advise you to return the apparatus and let the makers see it. If it is incorrectly made they will doubtless exchange it. Try six ounces only. Peter.—There is a lot of nonsense written about the use of soft limes. Try both, and you will soon be convinced that hard limes are suitable for either purpose. Jas. Osborne, Ph.C., of 6, Norton Gardens, Westoverroad, Wandsworth Common, S.W., writes :—In your answer in ‘Notes and Queries’’ of last month's LanTERN JOURNAL on the new oxygen producer and chlorine, you have made some remarks that are calculated to mislead. It is generally believed that there is a quantity of free chlorine given off with the oxygen produced from potassium chlorate. I have made a careful examination of the gas produced by this machine, and ; can safely say that if any chlorine is formed in the process it is immediately fixed by the metallic surface of the producer; no chlorine enters the bag, as I have proved by passing a large vclume of the gas through a dilute solution of indigo. Queries received after December 19th | will have attention in next. ; Gratifying Fnformation FROM AN ADVERTISER. Mr, HOULDERSHAW writes Dec. (1, 1896 : “Tam sure you will be gratified to hear that the Oprican Macic Lanrern JOURNAL AND PHOTOGRAPHIC ENvarGeR is a very effective medium for advertising, as within the four months I have advertised in it, I have in reply received applications from FRANCE, SPAIN, GERMANY, DENMARK, AMERICA, NEW ZEALAND, besides numerous letters from Great Britain and Ireland. In fact, it has proved quite an itemJto provide stamps alone to.answer communications."