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Updated: May 3, 2025
On speaking into the mouth-piece of the funnel, the sound-waves occasion undulations in the column of hot air which are communicated to the thermo-battery, and in this manner corresponding differences are produced in the currents in the wires leading to the receiving instrument. Oesterreichische-Ungarische Post. By MONS. SENLECQ, of Ardres.
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