Minute changes in temperature caused by compression and expansion in the air as sound waves pass through it aro being measured by Ellis A. Johnson, of the Massachusetts Institute of Technology. The instrument used can measure the “heat” of sounds too feeble for the car to detect.
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Manawatu Times, Volume 60, Issue 67, 21 March 1935, Page 9
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47Untitled Manawatu Times, Volume 60, Issue 67, 21 March 1935, Page 9
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