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MANAGERS AND PROJECTIONISTS
807
which holds the ends apart under pressure, thus pressing the upper ends together with the two halves of the contact shoes, into contact with the carbon, though not with sufficient pressure to prevent its rotating and sliding ahead as the carbon burns away at the arc. The spring is, it will be observed, well removed from the heat of the arc, and should retain its temper indefinitely. Means for adjustment of this spring is provided for by an adjusting screw at its end, 305A. Heavy bus bars and terminal clamps are provided, K, figure 306A, so that in case of emergency where it may be necessary to form a new connection, such as burning off of leads, etc. A new connection may be made quickly and without interruption to service.
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r~ Positive tl&tf Control Cover
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Pos. Carbon SpeedControl
Figure 307 A View of Arc Controller, parts exposed.
The arc controller is connected to the lamp by means of insulating telescopic rods D, Fig. 305A. The controller is mounted on the back of the lamp house, as is seen in Fig. 308A The motor of the controller is connected across the arc and operates on the well understood arc voltage principle, in conjunction with mechanical control of the positive carbon feed. So far as is possible, all gearing of the controller is enclosed in a metal casing, with which the entire controller, except the motor, is covered, thus protecting it from the dust, etcetra.
The lamp consists of four main elements, viz.: (A) The