The Optical Magic Lantern Journal (June 1894)

The Optical Magic Lantern Journal and Phcetographic Enlarger. 107 of what had been found to answer best and most simple in construction. . A is of tin, with the brass tube B soldered to the bottom and projecting about 32-inch below it. C is a circular brass FAN lid, with the tubes Dd and E F Y ~@ Soldered in it, and resting on a \ wire soldered round the inside \ of A. Tis a brass ferrule with one of the three pins acting on the screw cut on the outside of D. Gis a brass nut tapped to fit the screw on the tube H, and locking into the niche on the lower end of the tube B. H is the brass tube through which 7 the gas is passed to the flame. Tis atin cup soldered on the tube H to catch the overflowing oil. Kisa nut to fasten the ' tube into the end of the tube Ve V, the lower end of which is 1 soldered to the small screw of allows it to be attached by a flexible tube either to a gasometer or gas bag. The wick is made of the common flat cotton, the two sides being sewn together and placed loosely on the tube B; it is then cut off level with it and opened from the tube a little. inner tube H isabout 76 Of an inch smaller than B, which holds it in the centre by three points fited on its end and bent towards the centre, thus allowing the overtlowing oil to pass down between the tubes into the tin cup I; the gas is thrown obliquely into the flame by the small inverted platina cone N, which is attached to a fine wire bent so that it may be pushed gently into the tube, and remain where it is placed. The tube L serves to support the lamp by being fixed in a spring socket, and the lamp resting on the nut G, the end of the gas tube may be adjusted to a great nicety in the flame, by a common union joint M, which | The | merely turning the lamp round—a practical : point to be attended to. tage of this form of lamp was that it may, ina moment, be taken off and used as a common lamp for carryine about, and, although the tube B is open, the air does not pass up it so as to giveit the form of an argand flame. When taken off, the ferule F should be turned up till it does not smoke, and bv means of that it may be made a light of any power, either consuming a cubic foot of gas per hour, or reducing it to one-fourth Another great adyan| that quantity, regulating the gas to the size of ; the flame. The three nobs P serve as feet to prevent the lower end of the tube B being injured, and the opening E is for allowing it to be filled with oil without removing the lid, which is only required when a new wick is put in. ——:0:—— Hand Cameras for obtaining Slides for the Lantern. No. 3!.—Tue “ Monarcn.” One of the novel points in this camera is the adoption of carriers for the plates or films, whereby it is possible for one to carry several holders lose in one’s pocket, and at any time, and in ordinary light to place them in the camera where they may in turn be exposed. The carriers are made on the principle of a narrow box, and occupy little more space than the plate itself. The top, bottom, and sides of the lid are light-trapped, so that so long as they are not opened outside of the camera they can be handled with a certain amount of roughness. The camera is made go as to hold eight carriers, which are arranged one bchind the other, the front one being at the focal plane. A projecting wing on the foremost sheath engages in a slot to which is attached a lever A lever is pushed downwards wards with it the lid or door of the sheath, as shown at in fig, 1. When this it carries down thus exposing the plate which it contains to the Jens. After exposure the lever is raised which closes the sheath, after which the camera is opened and the sheath containing the exposed plate lifted out and placed behind the others, the second sheath now taking the position of the former one. When each has been exposed the whole may be removed and another lot : placed in the camera. In front of the lever spoken of, is a turn-screw B by means of which the lens may be racked in or out to suit any distance of object from a fev feet to distance. The focusing may be done whilst one is looking in the finder, for at