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In some senses, thermophone is marked as historical. Watch for register when choosing this word.
thermophone
noun 3
Definitions
noun
1
A form of transducer that generates sound waves of precise power.
2
A portable telethermometer, using a telephone in connection with a differential thermometer.
3
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.
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