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Before the invention of electromagnetic telephones, mechanical acoustic devices existed for transmitting speech and music over a greater distance greater than that of normal direct speech.

Before the invention of electromagnetic telephones, mechanical acoustic devices existed for transmitting speech and music over a greater distance. This distance was greater than that of normal direct speech.

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Some of the earliest known experiments were conducted by the British physicist and polymath Robert Hooke from 1664 to 1685.

Some of the earliest known experiments were conducted by the British physicist and polymath, Robert Hooke, from 1664 to 1685.

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When the Bell telephone patents expired and many new telephone manufacturers began competing, acoustic telephone makers quickly went out of business.

When the Bell telephone patents expired and many new telephone manufacturers began competing, acoustic telephone makers quickly went out of business.

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