[Answer] How did the first modern telephones transmit sound?

Step 1 : Introduction to the question "How did the first modern telephones transmit sound?"

...Electric telegraphs were the first method of transmitting messages swiftly over long distances. Using pulses of electricity, written communication could travel across continents. The first telephones used a similar network of conductive wires (or “lines”) to transmit audio data. For the first time, a voice could be projected hundreds of miles.

Step 2 : Answer to the question "How did the first modern telephones transmit sound?"

Via electricity:

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