We put the world before you by means of the Bioscope and Urban films (Nov 1903)

I/yftaH LotK^ TWortW 179 THE "URBAN" ELECTRIC ARC LAMP. "Simplicity, Efficiency, Perfection." The Electrical Arc Lamp for Optical Projection, invented by Mr. C. Urban, has stood the test for many ye ars, having established a reputation for itself strictly through its merits, it being acknowleged I iv laiitermsts and electricians alike, to be the most eliielent and best band fed Arc Lamp that has yet been produced. Possibly it owes this distinction to one fact ; that it is the outcome of practical experience of a biosCopist and electrician. It was designed therefore purely from the Cjnematographist's point of view, and is a thoroughly practical instrument in every way. The Lamp is 'of the "hand feed" variety, for experience has shown that it is by far the more preferable for Lantern or Cinematograph Work. The attention required by a good band regulator is so little as to add practically nothing to the operator's duties ; certainly not so much as a lime light exacts. An automatic regulator, on the other hand, is very liable to derangement, especially when carried from place to place, and when once out of order only an experienced electrician can humour it back again into a due sense of its duties and responsibilities. In general principle the Lamp is simplicity itself, for it consists merely of two carbon holders, supported at the ends of a pair of racked guide rods actuated by one pinion between them. The pinion is not operated directly, but by means of a worm-wheel gear, which gives to the carbon-holders the peculiar motion characteristic of this Lamp. The slow motion ensures great steadiness of the light. The Lamp is constructed to carry carbon rods of equal length, but of such relative diameter as to burn at exactly equal rates, and this arrangement is found to yield the steadiest and most efficient light). Special provision is made in the upper carbon holders by means of which the positive carbon may be set a certain distance behind the negative, so that the "crater" forms towards the front, and all the light is projected through the lenses. This necessary adjustment maybe accurately made whde the Lamp is actually burning, and the effect on the screen duly observed, and re adjustments may, with equal facility, be made from time to time if any inequality in the carbon rods render them necessary. Every necessary movement is mechanically provided for in this Lam}), by which the light centre may be raised or lowered or shifted from side to side to accurately centre it in the optical axis of the lens system, and to keep it there should inaccuracies in the carbons cause it to slightly alter its position. Every possible requirement of the lanternist has been anticipated and provided for It will carry carbons of various sizes to 30 m/m, and is applicable to the alternating current as well as to the continuous. As the upper and lower carbon holding arm are insulated with mica at the arm junction block, to which the electrical connection is made direct, no other portion of the Lamp is charged amiirt^"" -^=1 with the current and can be hand ^jgr led freely without, the least danger to the operator. The Carbon Clamp Screws operate Urban Lamp Model "A. on the projecting arm rods back of . , , the Carbons, and therefore remain practically cool and are not liable to be burnett ana corroded as in the case of Arc Lamps with Carbon Clamp screws on front oi arm rods. These lamps are noted for their excellent workmanship and high finish. M 2