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844 MOTION PICTURE PROJECTION
(10) by means of set screw (11). This carbon holder is mounted in positive carriage (9), so that it may be rotated by gears (8) and (7). Gear (7) is keyed to the slotted shaft (12). This shaft is continuously rotated during the operation of the lamp and through the gears and the carbon holder, impart a slow, continuous rotation to the positive carbon. The feeding of the positive carbon is accomplished by moving the whole positive carriage (9) forward. The positive carriage is carried forward by the rotation of the positive feeding screw (13). This is not a continuous feed but acts automatically. The automatic feed of the positive carbon is accomplished by the new third electrode system. The third electrode (19) is a ribbed casting of heat-resisting alloy, which is mounted just over the positive carbon. It is insulated from both the positive and negative parts of the lamp by being held by the insulated bracket (15). The screw (16) allows of a fine adjustment of the position of the third electrode. An insulated wire (6) is carried back from the third electrode to the rear of the lamp where it connects with the automatic control unit. The operation of this system will be described under the automatic control unit.
The negative carbon (21) is mounted at an angle of 45 degrees to the positive. This carbon is not rotated but is fed by a lead screw (14) running parallel with the positive lead screw (13) . This lead screw, by means of the traveling part (33) and the connecting rod (30), drags the negative carriage (25) along the guide rods (26). This feed rod is also operated automatically by a mechanism mounted on the control unit. The