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MANAGERS AND PROJECTIONISTS 1291
either amplifier in case of emergency. These voltage
amplifiers are three-stage units.
The power amplifier rack contains four power amplifiers, each amplifier supplying one loud speaker. Under normal working conditions all four amplifiers are used, but in emergency any one or more of them may be cut out of the circuit.
With this equipment (Type B, SPU) the following is supplied : Two sound heads, one input control panel, four loud speakers, storage batteries for filament current supply, a battery charger and a visual signal system. As in all types of equipment, synchronous turntables are supplied for each projector.
As has been said, an excellent, comprehensive instruction book is supplied the projectionist with each type of equipment. It is recommended that the projectionist, first of all, study the underlying principles laid down in the Blue Book. Learn how and why an amplifying tube amplifies, for example. Come to an understanding of just how and why a vacuum tube rectifies current, et cetera, through a long list.
By doing this you will put yourself into position to work, with understanding and real intelligence, from the operating instruction book supplied you by the company, which is something you cannot possibly do unless you do understand underlying principles.
Having mastered these things, then study your operating instruction book. Don't merely run for your Blue Book or your operating instruction book when something goes wrong. Study them, to the end that when things do go wrong, as they will even with the best equipment made, you won't have to take time to "look