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Bible Dictionaries
Thermophone

Webster's Dictionary

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(1):

(n.) A portable form of telethermometer, using a telephone in connection with a differential thermometer.

(2):

(n.) A telephone involving heat effects, as changes in temperature (hence in length) due to pulsations of the line current in a fine wire connected with the receiver diaphragm.

Bibliography Information
Webster, Noah. Entry for 'Thermophone'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​t/thermophone.html. 1828.
 
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