The Optical Magic Lantern Journal (August 1895)

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132 come none the less surely ; and if I have been the unworthy means of inducing any to mount the ladder of fame, I shall consider that my efforts in this direction have been well bestowed. | Editorial Table. PHOTOGRAPHY ANNUAL, 1895.—As mentioned in our last issue, this ponderous volume came to hand as we were going to press. It contains altogether some 866 pages, part of whichis devoted to good original articles, part to tables and descriptions of apparatus, and part to advertisements. As usual, it is under the editorship of Henry Sturmey, and is sold at 2s. 6d. Those who have not yet got a copy should get one. :0: Correspondence. BAGS v., CYLINDERS, To the Editor. Srr,—Replying to Mr. Taunt, allow me to say that the information I gave on the subject of retort safety valves, was based on my own experience. I use an old mercury bottle, laid horizontally on a’ powerful gas stove, and powdered chlorate and manganese, only in the Proportion of five to one, and though the gas always comes off rapidly, have never been able to get a greater accumulation in the delivery tube than would filla tea spoon. At one time I used a certain quantity of powdered salt, but after awhile gave it up and found little difference, so that Mr. Lewis Wright's statement that powdered chlorate without salt will cause violent rushes is incorrect under the conditions named above. My retort was originally fitted with a cork valve, which on more than one occasion ignited spontaneously, and after burning sufficiently loose, blew out, so I had the hole plugged up permanently. In the case Mr. Taunt alludes to, the delivery tube may not have been washed out after using on the previous occasion, or the retort may have been too small for the charge. Iam at a loss to know quite what is meant by a ‘sad accident” in this connection, but if Mr. Taunt can quote an authentic case of a person being killed or injured by the bursting of a retort from over-pressure due to the choking of the delivery pipe, I shall be glad to hear of it. The article in question was not intended as a complete statement of the case for and against either bags or cylinders, but I quite agree that the majority of lanternists will use cylinders, which after all proves nothing, as the majority of lanternists are amateurs to to whom ease in obtaining a light is of paramount importance, screen results being quite a secondary consideration. Yours truly, THE WRITER OF THE ARTICLE. 20: Notes and Queries. I. C. White——The apparatus answers well. Send usa stamped letter addressed to writer of the article, and we will forward it. Lens.—Measure the distance from a point midway between the lenses to a surface on which a distant image is sharply depicted, The Optical Magic Lantern Journal and Photographic Enlarger. H. Banks.—You are mistaken in saying that cylinders can now be taken by the London and South Western Railway to Jersey. We have been in communication with every railway in Great Britain, and have received particulars from same. In the report that you mention you will find the small word ‘not’; perhaps you have overlooked this. Vandervere writes :—I have seen it mentioned that by some process of artificial lighting, it is now possible to make photographs of the bottom of the ocean. Can you tell me how this is done, also where I could purchase or hire a set of lantern slides of some of the best examples ? ns.—We, too, have heard of it; and the explanation is as follows :—‘‘ The apparatus consisted essentially of a barrel filled with oxygen, surmounted by:a glass bell containing an alcohol lamp. By the aid of a mechanical contrivance, powdered magnesium is thrown on the flame of the lamp, which flares, allowing a view to be taken. The equilibrium of the barrel is preserved by means of suitable vents in the bottom, which admit water as the oxygen diminishes." We have ncither seen the pictures, nor can we tell you where vou can get the slides. We should say you cannot get them, at least, at present. Thos. H. Yardley.—1. See reply to “Lens.” 2.° The Hon. Secretary of the Lantern Society is Mr. W. Bashall, 21, Holland Villas Road, W. 3, The paper you speak of died some time ago. G. F, Ashley—Your question about the particular condenser would have taken too much space in this column, so we have dealt with the subject somewhat fully on another page. We have in type an article dealing with stage illumination, giving illustrations of how one person can control all the necessary lighting. This will appear in our next. Freak. Andrews.—We should advise you to discard the use of soft limes altogether, as you will find the hard ones preferable, no matter whether you use a spirit, blowthrough, mixed jet, or saturator. In a short time we anticipate that only the hard variety will be dealt in, as hitherto there has been a good deal of imagination as to soft limes being better suited with certain jets. Thos. Bryne writes :—Is it true that if a pinch of magnesium is put into the oil reservoir of a lantern oil lamp, it will increase the luminosity of same? Ans,.— This is a matter upon which you could have experimented yourself, but you will find that the addition of a little pepper or mustard will give the same increase as the powder spoken of, i.c., nil. R. B. M.—If you will examine any lantern, you will find that the condenser is fastened to the nozzle of front; consequently, when the front is deflected, the optical axis of the lens and condenser is not interfered with. W. H. Mathieson (New Zealand).—(1) It would hardly be fair for us to institute comparison between the goods of same style by different makers, but up to the present you can rely on any of the saturators which have been described editorially in our columns. (2) The candlepower mentioned is at present considered good for the apparatus. Some makers may have a tendency to ‘go one better than their neighbours,” but we happened to test this particular light. (3) If you refer to the home slides advertised in March Journal, they were disposed of within a couple of days. Will try and put you in communication with someone having such slides. A. S.—(1) About six inch focus. (2) Six or eight feet. (3) Opaque. (4) Archer or Tomkinson, of Liverpool. The address of the former will be found in all our issues, that of the latter some few months back. Rev. Young (Georgia, U.S.A.)—In our next.