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POWER SUPPLY FOR SOUND SYSTEMS
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Fig. 116. — View of Exciting Lamp Compartment Electric Reproducer Set.
.\ E»citing lamp. B Shield to protect projectionist's eyes from glare. D — Screw by means of which exciting lamp may be clamped into its socket. J and K — Partition be tween exciting lamp and sound gate compartments. It may be removed merely by pulling it out toward you. C and G — Thumbscrew enabling the moving of the lamp sidewiscand clamping it into place when adjustment is finished. X — Thumbscrew by means of which exciting lamp may be raised or lowered vertically. When adjustment is completed it is clamped immovably by screw I. By means of thumbscrew H, the lamp may be moved forward or back for focusing the light upon the slit. This adjustment is clamped immovably by means of thumbscrew E. M, located under this compartment, is the dial by means of which current is adjusted to the proper value, as shown by the ammeter on the front of the compartment door. This current must be maintained exactly at the amount set in your instruction book. Any alteration in the current value would cause over or under illumination of the sound track and change the volume of sound. Be very careful about this matter. N is the handle by means of which the angle of projection may be altered when using the Western Electric universal projector base. The insulated wire runs to the ammeter on the compartment door. The sound gate compartment adjoins the exciting lamp compartment on its right.
filament of a rectifying tube is surrounded by a thin layer of negatrons. The presence of this layer, or space