The Optical Magic Lantern Journal (November 1894)

198 The Optical Magic Lantern Journal and Photographic Enlarger. Reep.—-In the hire list of Mr. W. L. Reed, 7, Westmoreland-road, Newcastle-on-Tyne, we find that one of the special features is the loaning of slidea for lantern Mission work. The Religious, Moral, and Temperance sets, of which we find a large number, are mostly from life models and drawings. The set ‘‘Lantern Bible’’ is very complete, and it would be a somewhat difficult matter to find any of the Biblical stories for which illustrations were not prepared. Several pages of text and hymn slides are also given. BuivE Boox.—The 1894 Blue Book of British Amateur Photography (Loudon, Straker & Sons, 38, King William Street, E.C., 2s. 6d.), which has just been published, reflects great credit on the editor, Mr. Walter Sprange. In the 600 pages which this book contains, much interesting and valuable information is given in addition to the list of members of societies, and a number of fine half-tone illustrations are dispersed throughout the ages. f Newton & Co., 3, Furer Street, E.C.—In the new supplementary list we find, under the heading of ‘A Short History of the English People,’ that the set promises to be the largest ever published. Already it has reached 1,138 slides, and the number is being added to, it only having at present reached the year 1768. W.M.S.S.U.—The lantern department of the Wesleyan Methodist Sunday School Union, of Ludgate Circus Buildings, E.C.,is making rapid strides. In their new catalogue, fine lists of slides suitable forthe subjeet for which they cater aro to be found, but at our present time of writing neither time nor space will allow of their enumeration. However, the catalogues may be obtained on application. 10: Notes and Queries. JH. Steward.—In our next. B. R. T.—Measure the length of plate from corner to corner diagonally, and obtain a condenser of that diameter. . Ignoramus asks :—‘‘ Would.not an ordinary large household paraffin lamp, with circular wick of about 100 candle-power, act as well as a 4-wick lamp for lantern projection ?’’ Ans.—No, the flame has too large an area. W. T.—Thanks for information. E, D.—We will try and send youa.list.in a short time. R. W. J. Leicester.—We tried one, after the style you speak of, but made it upright. This was not a great success as far as the lasting power, but we will have a horizontal one made, and will let you know the result. Rev. W. Miles Barnes.—We regret we cannot agree with you about the limes. F. Hodgson.—Yes, the limes alluded to in last issue can now be obtained; they are named '' Hardazion.” M. D. writes :—‘I have a lantern and a 60 ft. cylinder, and my gauge shows 18 ft. of oxvgen. I am about to give a ‘ show' in a village where no coal gas is obtainable, and so I am getting a 20 ft. cylinder of coal gas. I use a safety blow-through jet,the same-as pattern attached, and I note your remark at foot of first column .on page 168.of last month's Journal, viz., ‘that the safety jet can be used with both gases from cylinders,’ etc., but you do not say what would be the effect supposing the oxygen were to burn out before the coal gas was used, or vice-versa; would there be any fear of an “explosion from this cause in the use of this particular jet? This is the question I should be much obliged for your answer. I am not using regulators, but only the, ordinary nipple and the union, and I regulate the supply by the key of cylinder. There is just 4 bare possibility of one of the two gases burning out while in use, and I should like to feel satisfied that nothing more would happen than that the light would go out. Ans.—You will find it a difficult matter to regulate with automatic regulators. There is no danger whatever, and if things happened as you suggest, the light would simply go out if the hydrogen ran out; and if the oxygen supply gave out, the gas would simply burn like-house gas. Geo. Kilburn.—'' Sunshine”’ from Macmillan and Co., ‘‘ Soap Bubbles” from Longmans, and ‘ Science at Home"’ from Sciopticon Co., Colebrook-row, London, N. W. B.—We Kiave used your initials, as the non de plume you give is already in this column. You should get exceedingly thin glass ; that known as ‘‘ Microscopic’ will answer. Houghton, of Holborn, keeps it. Mica is of little use. Colour.—If you wish to spread the colour evenly over a largo apace on the slide, it should first be brushed over the space, and thea dabbed with either @ dabber or the end of the finger until quite even. This, although it may seem @ simple matter is one which requires a great deal of practise to acquire properly, but when once mastered, it can be done with great dispatch. Hintern.—The transparency and finencss of the ground glass can be improved by first warming it, then rubbing @ piece of wax over it. W. Evans.—(1) We are sorry we cannot advise you as to which of the saturators (advertised in our pages) you should purchase, as we always’ make a point of not instituting comparisons of similar goods by different makers. Read the announcements of each, and having selected one, endeavour to get it on trial. We feel assured that, in our position, you will agree with what we have said. (2) The ‘Scott’ is quite out of date compared to the modern styles. Culfargie.—Of course we heard of the breakdown, but did not think it worth while to mention -it in our columns. Mark.—You can buy a Y or T piece for a few coppers ; you will not find it an easy matter to make a suitable one. . Lens.—An objective of four inches focus is no use whatever for your purpose; get one of about 12 inches focus. Too Late for Insertion.—‘‘ Photographer,” Mrs. B., Helmer, Stevenson, Webb, Suffield. ——: 0 :—— Mr. Saunprrs, of Heath Street, Birmingham, writes : “‘] had no idea that the OpticaL Macic LanTEeRN JOURNAL circulates as itdoes. From my advertisement therein I have had replies from UNITED STATES OF AMERICA, FRANCE, RUSSIA, &c.” Major. Wu. AIKENHEAD, of Malunnah, W. Davenport, TASMANIA, says: ‘The OpticaL Macic LANTERN JOURNAL is such a useful publication that I always recommend it to my friends and acquaintances who may be taking up lantern work.