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The Optical Magic Lantern Journal and Photographic Enlarger.
which is to be employed in lighting the town of Portsoy, Banffshire. The carbide is contained in cast iron generators attached at either side of the gasometer, and can be replenished during the time the apparatus is working. In the small sizes this apparatus is made without any counter-weight and with only one generator.
The single automatic gas generator of Read, Holliday & Sons is shown at Fig. III. In order to charge this apparatus it is necessary to pour water into the larger tank shown until it stands about 6 inches in the upper receptacle, which is divided at the dotted line, letting the air escape by means of the small tap seen near the top of the piping at the right hand side of the illustration.
The generator is situated at the side of the gasometer, and when about to place the supply of carbide in the cage situated immediately under the screw-down lid, at its top the tap at the lower end should be opened to allow of the generator being emptied of any water which may be in it. When the charge has been placed in the generator and the lid screwed down this lower tap is reversed, which allows the water from the gasometer to reach the carbide basket which in turn expels its volume of water up a tube into the upper part of the gas or water holder not unlike the principle explained in our June number of this Journal in connection with the Aladdin lamp of Mr. Tylar’s. When the gas generated has been used, the water again
flows into the tube connecting the gasometer with the generator, and rising in the generator again attacks some of the carbide when more gas is evolved and so the apparatus acts automatically.
A complete lantern outfit with acetylene generator is exhibited by Prof. Hyder, of Hastbourne. Thisis extremely portable, inasmuch as the lantern and all the fittings in the illustration, Fig. IV., pack up inside of the generator. In the sketch water tank and gas bell are shown at a and ps, the basket for carbide at c, the purifier at D, the folding extension stand at E, a tray for holding slides, etc., at F. The generator works on the usual dipping plan. The jet consists of five burners of 00000 Brays, so placed as to give an intense flame of small proportions. When packing up, all the adjuncts with the lantern are placed in the bell portion,
Fig. IV. so that everything is contained within the dimensions of the water tank.
The British Acetylene Company make a small generator specially for lantern use; these may be obtained either with or without condenser and safety valve, according to price. The generator, Fig. V., is compact in form and is automatic in action, it automatically giving the required supply of water to the carbide chamber when the quantity of gas on hand falls below a given quantity.
Both the Incanto and Abingdon generators are to be seen at work at this exhibition; these have, however, already been illustrated and described in our columns and have been found to act in avery satisfactory manner.
In addition to the above several generators are on exhibition, but for =the most part are very large machines capable
Fig. V. to maintaining a large installation.