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386 SOUND MOTION PICTURES
creation of electrons; a plate, positively charged, to which the electrons are attracted; and a grid, consisting of a helix of fine wire, inserted between the filament and the plate for controlling the amount of the electronic flow. This action of vacuum tube plays three leading functions in radio work; namely, detection, amplification, and generation of highfrequency electro-magnetic waves.
Volt: The practical unit of electromotive force; an electric pressure capable of producing a current of one ampere through a resistance of one ohm.
Voltmeter: An instrument for measuring the voltage of a current flowing through an electric circuit.
Watt (Abbr. W.) : The unit of electric power. To find power in watts multiply voltage by amperage. 746 watts equal one horsepower. 1000 watts equal one kilowatt (K. W.).
The foregoing list by no means covers all the terms which will be encountered in sound equipment, but it does cover the more common and perhaps least understood terms confronting the layman. It thus provides a core of information suitable for most circumstances.
I suggest that these terms should be understood by every person responsible for adequate operation, from the manager down. One should not be frightened away from technicalities by the mere sound. Often they mean something quite simple. Otherwise, in spite of theoretical difficulties, they have an immediate practical connection that can be learned in spite of the riddle of what lies behind. In almost every case a man can get to know the meaning of a term if he will try two or three times instead of giving up at once.
It is obvious that, when one is dealing with outside, expert assistance, one can cooperate most intelligently when one knows what the other man is talking about. Furthermore, the more detailed the knowledge inside the theatre, the less the dependence on help from elsewhere. I do not