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CUTTING A DISK In the sound studio a singer is performing a popular number. The microphone suspended from overhead wires picks up the sound. If a whole group of musicians were being used, more microphones would be spaced about. In the control room at the back stands the sound engineer listening through earphones and turning dials on the crowded panels before him. Soon, as a result of this recording session, tens or hundreds of thousands of people will be able to flick on a phonograph and, wherever they are, hear this same singer with her guitar performing this same popular tune, as often as the hearer chooses to repeat it.
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COMPUTERS THE ELECTRIC BRAINS
THE BRAIN AT REST Along one wall of the room tall gray cabinets are ranged. They contain the "gray matter" of the electronic brain. From the front they look as blank as a face without a thought. But open the doors at the back and you will see thousands upon thousands of tiny electric circuits wired with pink, blue, green, and orange wires. Those are the "nerve cells" of the brain. Along another wall in smaller cabinets the brain's "slow memory" or reference library is stored. Its "fast memory" is on a magnetized drum or other device inside the machine. A neat, desk-sized set-up in the center of the room is what we might call the brain's "ear." This is where it receives its instructions.
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