The Optical Magic Lantern Journal (October 1892)

130 The Optical Magic Lantern Journal and Photographic Enlarger. Rousrer Stame Puoto Cararocue.—Mr. Wm. Tylar, of Birmingham, is sure to get hold of a novelty if it be a good one. A short time ago we received an invitation to send our photo and receive in return a rubber stamp. We have lately received this put up in a neat box, also containing ink, slab, roller, &. After a few experiwental trials, one is enabled to make excellent impressions. A little ink is laid on slab, worked even with roller, which is then applied over the surface of stamp. The impression given is of similar nature to a Meisanbach block. The cost, according to style, is 7/6 to 12/-, put up with all requirements in a neat box 4x 14x42 in. In Mr. Tylar’s new catalogue which has just come to hand, may be seen an impression taken from such a stamp as we have described. It also contains about 90 pages of apparatus pertaining to photography and lanterns. CaTaLocur.—A new catalogue of 104 pages, is to hand from Mr. R. H. Clark, of Koyston. Lanterns of various kinds are described, and as for lists of slides, we find that the names of them occupy about 80 pages. Hayp Camera AND HOW'r0 USE Iv.—Illiffe & Son, London. This useful book, by Mr. Walter D. Wilford, is, toa large extent, made up of a series of articles which appeared in Photography. In it we find that every conceivable portion of hand cameras has been treated upon, and useful instruction given to users. Ninteen pleasing reproductions from hand camera shots, are distributed, throughout the pages of this book. The price is 1s. PxorocraPHic Repropuction Process.— Hampton Judd & Co., 13, Cursitor Street, E.C. By P.:C. Duchochois. Edited by E. J. Wall.—In this work we find particulars of the Cyanatype or blue process, The Juk, Cuprotype, Aniline, Primuline, and Feer processes. Photogaphing upon metal, for engraving, is treated upon, and particulars given of the Uranotype, Platinotype, Carbon, powder, and various other processes. Gs Correspondence. TO PUT OUT ETHER LIGHT. [To the Editor.} Sir,—I notice in the article on Saturator and Jet, Clericus says, “In putting out the light, turn off the oxygen first.”” This is a mistake. This would cause the ether light to rush back when it is turned off, and go out with a snap, which is not pleasant. The ether light should be turned off first, and oxygen left on until the lime has cooled down a bit, then there is no danger of the snapping out.—Yours, &c., iL. ILLUMINATION IN DRY AND WET WEATHER. (To the Editor.) Sir,—I have repeatedly noticed during a long series of exhibitions, that I am better able to obtain a brilliant image on the screen in dry weather than in wet. At the light itself I have not been able to discern a difference, but to my mind a great contrast is perceivable on the screen. When we have a spell of dry weather, and the atmosphere is dry, I can always fine illumination ; but during wet weather there seems to be a very great loss of light. The light asan illuminating point appears to be the same, but by the time it reaches the screen a lot of it seems to be gone. Now, Mr. Editor, if you will kindly insert this letter, others may have noticed the same effect, and will, perhaps, give their experience. It is quite possible that my eyesight may be beginning to fail, and that the difference of light may be imagination on my part. It is well known that the state of the weather has an influence on the tones procurable from a violin, may it not also have something to do with the penetrating of rays of light ?— Yours, &c., AGNOSTIC. Notes and Queries. Stephen Bretton.—We have handed your letter to Messrs. Houghton & Son. They will send you the desired samples of. vlass. MI. Simpson.—We replied by post after seeing the inventor of the other apparatus. Afr, Scott writes to say: ‘he does not intend to reply to Mr. Pumphrey’s remarks in last issue, as it will only lead to ‘abusive writing.’ ”’ I. Allen.—You will find the address of a Chicago firm in this issue. They are, we think, to bring out the apparatus we described on p. 106 (Sept. 1). C. Smiles.—1. Several people make a good living with the lantern. 2. Advertising is the only way. 3. The Qualifications are—a good man of business, a good lantern operator, good spokesman, and an interesting subject. You will find an article in the present issue by W. Kirkland bearing upon the subject. Optic.—We are compelled to postpone your subject until next journal. Yeo writes: ‘(In looking over my file of journals, I came across an article on aluminum, but cannot find out anything about a light solder for using with this metal. Can you tell me of one?” Answer.—A good solder for the purpose may be made of cadmium, zinc, and tin. We cannot say the exact proportions, but for *a strong solder the proportion of cadmium must be in excess; for great adhesion zinc should be in excess; whilst if it is necessary that it take a high polish there should be large proportion of tin. Bottle asks ‘‘the probable cost of a steel cylinder to hold 10 feet of gas.’ Reply.— From 30/to 35/-. J. W. Cates (Montreal), writes:—“I wish to ask through your paper the cause, when dissolving, of the picture getting indistinct slowly after the dissolving is done, and not at once. Also, how can I prevent a faint outline of the picture in the darkened lantern appearing on thescreen. Answer.—l. Because the lime from which the gas has been turned off emits a little light until it has somewhat cooled. 2. By having a cap or flasher on the lens; by sliding an opaque object between the light and the lens, or even by slightly turning the lime. Shadow.—You will find several diagrams relating to shadow pictures in a recent volume of La Nature, published in Paris. A Reader.—Our first article, ‘‘ Flatness of Field,” may perhaps aid you. You are wrong in supposing that the grinding of lenses is ‘for the most part chance work, the best being sold at high prices for photographic work and the balance for lanternists.” PF. W. Lewis asks, is it safe to use oxygen which has been in a cylinder for six months? Answer.—Yes. Reader from the First writes: “I must congratulate you on the success of your wonderful journal, and cannot imagine how you manage to give us so many interesting articles each month. It is a marvellous pennyworth. Reply.—Thanks for your sentiments. Does thismonth’s journal also please you, both as regards quality and quantity. “OUR LITTLE JOURNAL GETS ABOUT A BIT.” Mr. Frank F. Weeks, when settling his account and renewing his advestisement writes: ‘‘ As the result of my advertisements in your journal, I am receiving scme very flattering orders, even from America, New Zealand, Australia, and other remote parts. So it is evident that ‘our little journal gets about a bit.’”