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March 27, 1891.] THE PHOTOGRAPHIC NEWS. 253 Qatent IEntellgence. Specifications Published. 4,704. March 1890.—“ Cameras for Photographing Objects in Motion.” Frederick Henry Varley, 82, New ington Green Road, London, Civil Engineer. My invention consists in a special method of employing drums or spools for paying out the sensitised paper or film, and in gearing the spring work which gives the initial revolu tions to the spool to another drum for winding up the film so that the tension upon the paying out spool and the winding up drum are equal or nearly so, and in the use of an adjustable displacement lever, which removes the exposed surface of the film and sets the apparatus for taking the next picture ; also the employment of a frame or hollow screen in front of the sensitised film pierced with one or more holes for the purpose of correctly registering each picture. 3,718. March 8th, 1890.—“ Photographic Studios.” Richard Williams Thomas, 121, Cheapside, London, Artist. My improved portable artificial light studio is composed of adjustable rods carrying white canvas, or other sides or walls, and, when erected, such sides or walls are fixed at desired angles whereby the artificial flash or other light is thrown on to the wall or side immediatley facing the lamp, and thence reflected on to the other walls or sides of the studio, whereby the sitter is reproduced in the photograph without shadows or similar defects usual in taking artificial light photographs. I employ a number of metal upright rods (usually five) fitted with necessary feet, or stands, and capable of extension to desired height. The top of each upright rod is formed to receive the ends of other rods of similar thickness and of the desired length, which extend from one upright rod to another, so that when fixed they form the framework of the studio ; the lengths of these rods are so arranged that the front, or entrance, of the studio is narrower than the sides and back, the back and sides being arranged at suitable angles. Suspended from the top rods to the whole of one side, and part of the other side, are stretched sheets of canvas or other white material, a suitable background being provided for the back. The entrance to the studio is supplied with looped curtains or other suitable arrangement. At the back of the said stretched sheets, I suspend from the said upper rods curtains of any dark material for the purpose of resisting the penetration of light. At one side of the studio, near the entrance, I erect a lamp for burning methylated spirit or similar liquid, this lamp being erected upon an adjustable stand for the purpose of regulating the height desired. This lamp is placed at that portion of the side of the studio which is not supplied with the stretched sheeting, and it is surrounded at the back by a similar curtain or material, with which I enclose the sheeting round the studio, the space being provided for the lamp by means of another upright rod with necessary top adjustments. Suspended from the upper rod in front of the lamp, I place muslin or similar material as a continuation of the sheeting at that point. The lamp itself is supplied with a cavity for hold ing the magnesium powder or other substance used for pro ducing the flash or other light similar to lamps now in use for that purpose. Connected with this cavity is a tube extending to any desired place, and the end of this tube is attached to an air-pump or bellows, or similar contrivance for the storage of air, so arranged that the operator can, by hand or other wise, regulate the pressure of the air through the tube, and, by this means, slowly force the magnesium powder into the flame of the lamp, securing a longer duration of light than obtained by the ordinary artificial flash process ; or he can, by quicker pressure, by the same means obtain an instantaneous flash. By means of the arrangement of angles I employ for the erection of my said studio, the light strikes the sheeting im mediately facing the lamp, and thence to the background and across to the opposite side of the studio, the sitter being sur ¬ rounded by light without seeing the lamp or having the incon venience of the flash direct upon him. The casing of the lamp is so arranged as to carry off in any desired direction the smoke and heat necessarily arising from the use of the mag nesium powder or similar material. The use of the said stretched sheeting at the proper angles, and the position in which I place the lamp for artificial light photography, enables photographs to be taken by electric or other artificial light, with much shorter exposure than by the ordinary artificial means, in consequence of the intensification of the light by the reflection produced from one side of my improved studio to the other. 6,239. April 2ith, 1890.—“Ascertaining the Distance of any Object for Photographic Purposes.” Henry Mitchell Hastings, 54, Edith Road, West Kensington, Fulham, London, Analytical Chemist. The special purpose of this apparatus is to ascertain correctly the exact distance of the object, so as to be able to adjust the lenses of cameras where the image cannot be viewed on the ground glass. I employ a lens of suitable focus fixed at one end of a telescopic body in such a way that the image of the object required is thrown on a disc of ground glass or other suitable material fixed within the telescopic body itself, such image being viewed through an adjustable focussing eye-piece, placed at the opposite end of the telescopic body to that carrying the lens which throws the image ; the focussing of this image to be obtained by rack and pinion, or other suitable means, such distance being registered on a scale attached. As an alternate method, an apparatus may be made of the ordinary telescope, opera, or field glass type, provided with sufficient length of draw, and with a scale showing the dif ferent distances. In this case the object is viewed direct, the intervention of the disc of ground glass not being necessary. Eorrespondence. SHOWING CELLULOID FILMS IN THE LANTERN. Sir,—I have found the following plan answer for showing celluloid films in the lantern. Fasten two cover glasses together along one side by a slip of silk about -inch wide. They will now open and shut like a book. Shut the film to be shown be tween them, and place in the slide carrier. By having two of these a film can be placed in each alternately, so as to cause no delay while exhibiting. I find that, using the oxycalcium jet, I can show film slides six to eight feet across on the screen ; above that size they will not allow enough light to pass. I may add that I find coagu- line the best thing for holding the silk to the glass. H. G. M. CONYBEARE. The Hut, Inr/atcstone, 28rd March. THE NATIONAL PHOTOGRAPHIC EXHIBITION. Sir,—Arrangements are being made with a view to facilitate the transmission of Liverpool exhibits to us, by sending a representative to sort and overlook the pictures entered here, and to see to their speedy dispatch. We have already the promise of a great number of exhibits from Livepool, including the wonderful flash-light pictures by the Countess Loredana de Porto Bonin. S. G. Buchanan Wollaston. Crystal Palace Co., Crystal Paiace, S.E., March 2ith. Cementing Glass or Porcelain to Metals.—A method for uniting glass and porcelain with the metals, for scientific and experimental apparatus, has been brought before the Socit de Physique by M. Cailletet. He slightly heats the end of a glass tube, for instance, and platinises it by brushing it over with neutral chloride of platinum mixed with essential oil of camo mile. On the vapour of the latter passing off, the end of the tube is brought to a dull red-heat, when it is found to be coated with a thin layer of platinum, suitable for receiving a ring of copper by electro-deposit. All the metals capable of being soldered by tin may then be united to the tube, the union being so perfect as to stand a pressure of 300 atmospheres.