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MOTION PICTURE PROJECTION 861
all times a perfect circle, presenting a very small but exceedingly brilliant surface head on to the condensing lenses. The negative and positive carbons are of the same diameter, but cored, and each has a different chemical composition in the core. As the current is fed into the high intensity carbons, a cup-shape crater is formed and a combination of gases is emitted and burned which develops the brilliant and splendid quality of the high intensity light.
Power's "G-E" high intensity arc lamp is absolutely automatic once the arc is struck, which means that the lamp embodies its own arc control, and this is also a radical advance in arc lamp construction. Once properly set in the lamphouse, the only adjustment required is the forward and backward movement of the entire lamp by means of which the size of the spot at the aperture is controlled.
Replacing carbons in the lamp is a very simple operation, as it is merely necessary to slip them into place and tighten screw in the carbon clamps. The terminals of the lamp are the same type as those used in Power's Type "E" lamp and there is an absolute assurance of a positive connection between the wire and the current carrying part of the lamp. There is no danger whatever of the wires burning loose from the terminals.
Power's "G-E" high intensity arc lamps can be supplied for three current rating as follows : 45 to 55 ampere lamp (50 to 55 volts, using 9 mm. positive carbon and ll/32nds of an inch negative carbon) admirably adapted to smaller theatres desiring the best possible