The Optical Magic Lantern Journal (October 1895)

171 means of warming a dark room, used for photographic purposes during the cold weather, as the flame was exceedingly hot, whilst it gave off no light that would be detrimental during photographic manipulations. into the side, but in the new form, which is here illustrated, the lamp is made self-acting. reservoir is filled with ordinary paraffin oil, and for use a small quantity of methy on top of the reservoir, & match applied, and in a minute or so after the burner has had bottom at the In the old form | of lamp it was provided with a small pump let ' bumptious, it is not in my line to blame those who The © when wanted . lated spirit is poured | into a dented cup time to heat, a lever | of the reservoir is . turned to one side according tothe amount of © flame required, and the lamp will thus go on . burning without attention for about a couple of | hours. Beside the uses suggested above, this ‘ lamp comes in for general domestic use in the | cooking, boiling and frying line, all of which are | ' Journal, together with money order, covering value of * Uno Mano Carrier” carried out in a perfect manner. ——, 0 Editorial Table. ' give us his name BinLy SLtmes.—As will have been observed from their |; advertisements in this journal, Messrs. Stevens Brothers ' of Glasgow make a special feature of Bible slides. new catalogue contains an admirable and large Jist from which to select. In addition to this, they are also intro| Their |: ducing sets of slides pertaining to Temperance, and also , sets illustrating some of Sir Wa!ter Scott’s novels. G. W. Wicson & Co.—In their new list:, this fiem give . particulars of a number of new sets of slides pertaining to _ educational subjects, travel, etc. found a good one pertaining to Japan and the Japanese. A special list is issued exclusively for the sets pertaining to South Africa. R. H. Cuark.— Each year the catalogue issued by ~ Mr. Clark of Royston, grows larger in size, and this year it has reached nearly 180 pages. Particulars of lanterns costing from a few shillings to several pounds are given; — aod as for names of sets of slides, their name is legion. W. C. HuGHES.—In a new list of slides for hire, Mr. Hughes calls attention that in order to prevent delay, all hire orders should be sent to his branch at 336, Kingsland Road, in preference to Brewster House, Mortimer Road, Kingsland, as the latter address is reserved for sale and show-room purposes. PICTURESQUE WoRTHING.—A fine Souvenir of Worthing, in the shape of a high-class collection of photographic reproductions, has been brought out at the popular price of 1s., by Mr. E. Baruch Blaker, of Worthing. Eighteen fine and interesting views of the town are given, and the whole get up is the perfection of neatness. Among the sets willbe ~ . nor address, so cannot do anything in the matter. is evidently a reader of your paper, perhaps if you will Correspondence. MR. PRINGLES' CHALLENGE RE JETS. To the Editor. Srm,—Mr. Clay need not fear that I shall consider him have confidence in their opinions. I may again point out that my original suggestion was not @ competition between any two jets, but a general trial of as many jets as possible, in order that we might see to what extent the clainis made for many jets are justified by their performancs. But I shall be pleased to meet Mr. Clay at some time and place which — I will try to arrange with him by private correspondence ; so that he and I at least may come to some conclusion as to our jets. I agree to his three conditions for our preliminary trial; I always use Brin's gas, I don’t care how much gas I use within reason, and the maker's name is of no consequence to me so long as my jeta are a8 good as any others. I am, your obedient servant, ANDREW PRINGLE. Bexley Heath, September 11th, 1895. CASH FROM JOHANNESBURG, SOUTH AFRICA WITHOUT ADDRESS. To the Editor. DEAR Sir,—We have received from some person unknown to us a cutting of our advertisement in your and postage. This is what we presume he requires, but we have neither his per s he be good enough to insert this letter he may see it and and address. The postmark is Johannesburg, South Africa. Yours faithfully, W. H. TOMKINSON. Liverpool, September 10th, 1895. BAGS V. CYLINDERS. To the Editor. Srr,—Allow me to express my regret at having trodden on ‘an enthusiastic amateur’s '' corns, and to say that, although he and his two friends are examples to the ; contrary, I fear many will agree that there is much room for improvement in most amateur exhibitions. That ‘' bags will not give sufficient pressure to work the best class of mixed jets to their full power” is hardly borne out by facts. Mr. Lewis Wright has investigated this matter of pressure, and recommends for ordinary work a pressure of 9 inches of water, or 6 ounces per 8 }uare inch, and it is no difficult matter to weight bags so as to give at least this pressure in the jet chamber, _ provided the passage through the tubing, taps, and . dis3Olver is of sufficient area. i . objectionable, as tending to expel the gases from the Excessive pressure is orifice in a partially mixed state. I thank ‘‘A Raader”’ . for the instance he gives of a retort accident and fancy the case he refers to is one that was mentioned to me . Many years ago by a dealer who was trying to sell me a ' cylinder, though at the time I was told no particulars. . It is quite possible that a safety valve opening would