In Los Angeles last week, a 28-year-old inventor named James Tanner announced that he has developed a new electronic system for surveying TV audiences that may make all existing ratings systems obsolete.
Tanner calls the heart of his device a comparator. It works with a sensitive receiver that pulls in a signal from a TV home receiver and compares it with all signals being broadcast by TV stations. The device fits into a panel truck that is driven around city streets, sweeping up signals from all TV sets in the area and calculating what channels they are tuned to. Tanner...
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