from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A form of transducer that generates sound waves of precise power
from the GNU version of the Collaborative International Dictionary of English
- n. A portable form of telethermometer, using a telephone in connection with a differential thermometer.
- 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.
from The Century Dictionary and Cyclopedia
- n. An electrical instrument in which sounds are produced by the changes in the circuit due to variations of temperature.
Sorry, no etymologies found.