Word: cathoderay
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Dates: during 1950-1950
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Bats can and do make audible cries, but the sounds they use to navigate by are ultrasonic-much too high-pitched (up to 120,000 cycles per second) for human ears to hear. So Dr. Griffin rigged a special microphone and hitched it to a cathoderay oscillograph. Each inaudible peep from a defrosted bat made a measurable pattern of light on the oscillograph screen...
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