We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
MANAGERS AND PROJECTIONISTS 1337
resulted and place the other terminal in one of the large holes in the center socket. If no buzz results, try the other large hole. This test includes the 24-ohm resistance. If no buzz results from this last, then place the testing terminals directly across the 24-ohm resistance. A buzz of course indicates the resistance to be O. K., but that one of the circuit wires is "open." No buzz across the resistance of course shows the resistance to be burned out.
Next we go to the next and last tube. There is nothing but a wire between this tube and the center one, but between it and the negative terminal on the amplifier is a 4-ohm resistance, which must be tested the same as directed for the 24-ohm one.
It may have occurred to the projectionist that a battery and voltmeter would do as well to test with, but this is not true for the reason that, because of the fact that a voltmeter draws very little current, it would show a good reading through a high resistance, such as, for example, a badly corroded connection would offer. When using a battery and buzzer you would get no buzz, or only a very weak one, through such resistance.
True, it is possible to use a battery and flashlight bulb, or even a 110-volt bulb hooked to one side of the power circuit — the positive — but the battery and buzzer is in every way better and safer.
THE FILAMENT CIRCUIT.— It should be under stood that the only trouble the filament circuit, located inside the amplifier, falls heir to is a broken wire, a short or ground or burned out resistances. No instruction is necessary as to repairing a broken wire, except avoid acids in soldering. Use nothing but rosin core solder. Clean the metal thoroughly.