The Optical Magic Lantern Journal (November 1895)

196 The Optical Magic Lantern Journal and Photographic Enlarger. Correspondence. SQUARE LIMES. To the Editor. Danae S1z,—Allow me to suggest a detail as regards ‘limes for lantern work. We lanternists have all been troubled by the hydrogen flame from a blow-through jet curling round the side of the lime, and striking with its intense heat towards one or other of the back top corners of the lantern. This may, of course, be caused by an excess of hydrogen, but it is more likely in the -case of competent lantern operators to be due to the flame not striking exactly'in the centre of the lime -eylinder. In a single lantern, a well made burner if correct at the beginning of the exhibition will remain eo. But with a bi-unial, and more especially with a triple, the metal, including the burners, in the upper dantern or lanterns will expand, and, I find, most likely slightly warp. This slight warping very often causes the flame to move from the centre of the lime, and thereby cause the trouble I have already mentioned. Now, could this not to a certain degree be remedied by using & square lime instead of a round one? Although -& cylinder is required for a single, a cube would not be any disadvantage in a bi-unial or triple, These square limes would pack much better, and could, I should ‘think, be compressed much easier by the maker. Believe me, yours sincerely, FRED. J. SCRIMGEOUR. Dundee. STANLEY SHOW, PHOTOGRAPHIC SECTION. To the Editor. Srr,—Will you kindly announce in your columns that ‘at the nineteenth annual show of the Stanley Club will be held the fourth photographic section, from November 22nd to 30th. Prospectuses and full details will be ready shortly, and Amay be obtained from Yours, etc., WALTER D. WELFORD, 59 and 60, Chancery Lane, Manager. London, W.C. ——:0:—— Notes and Queries A.H. Howkins.—The jet by the Manchester Oxygen Co, -should suit your requirements. Herbert Rawson writes about a second-hand lantern ‘which he hae had refitted, and which will not give an image larger than 14 inches in diameter. If he will rack the lens or move it by some means closer to the slide he should overcome his difficulty. the lantern being of course placed further from the screen. If this will not answer and he likes to forward the objective to us, -carriage paid, we shall be pleased to examine it and tell dim wherein the difficulty lies. ia ie ee a ee J.M. McKay—The reason of the dissolver not blowing the | “tubes off in the case of the blow through jets, was because ‘the leak was not apparent under the low pressure. With ! hours. leaked doubtless in the manner you state, but unless we examined the dissolver we could not definitely state any reason other than that suggested. Albert Lawson.—1. Yes, the special finish internally has a lot to do with the intensity of light. 2. Steward, of 406, Strand; Newton, of 2, Fleet Street; F. Brown, 13, Ossulston Street, all of London. S. Knight, Junr.—1. Yes, the saturator mentioned is an excellent one. 2. About six ounces of ether for two 3. About four and a half feet per hour. 4. The usual price is 6d. or 7d. per four ounces. A Subscriber.—They are a mystery, but you will see from this journal that the restrictions have fallen through. H. N. Houghton.—The advertisement appeared in this journal some time ago re the gelatine films, and it is again sent in for insertion in this issue, see advts. Member.—We quite agree with you that the first meeting of the Lantern Society held a few days ago savoured too much of a lantern dealer's shop. W.S.D.—We do not know why you should pay 4 subscription to enable dealers who are not members to come to tha Society and advertise their wares. We do not, as you state, control the Society, but simply act as honorary auditor. The secretary is the proper person to approach, but you can surely bring your suggestion before one of the meetings. Single.—Messrs. Noakes and Son, of Greenwich, will supply you with a screw down valve ready to attach to a cylinder, but of course you will require to let them know the shape of the valve piece of cylinder. Saturator.—Yes, he is the same Mr. Timberlake whose fame in connection with cycles was known everywhere & few years ago. We understand he makes for the trade. Swindled.—We cannot publish your letter, nor can we express any opinion thereon. We would suggest that you put the matter before a lawyer. A. H. Short.—(1) We never institute comparisons between the same class of goods by different makers. (2) Either of the lamps will give better illumination than the incandescent, but there is not much difference. (3 See Butcher’s advertisement. P. R.—They will both appear in next issue. J. Boyle.—Too late for insertion in this Journal. Bluse.—The horse without neck and head on one glass, and the head and neck on the glass that is made to swing. Amateur writes :—‘‘ Will you please tell me how to stain brass blackish, varnish will not do for my purpose as it would get scratched, I enclose 1s. for the information.’’ Ans.—Having cleaned the metal, coat with a solution of nitrate of silver and nitrate of copper, and heat until the desired colour is obtained. The money, less 1d. postage, was returned, as we make no charge for answera in this column. Sydney Burrows.—The addition of a small piece of camphor will prevent it turning sour. Inventor.—The patent was taken out in 1886, and is dated June lst. W. I. Jones.—Mr. Hughes, of Kingsland, used to make : metallic bindings for lantern slides, and we have not tthe mixed jet both gases were at higher pressure and jearned that he has discontinued it. Write him.