What specific apparatus was utilized in the physically straightforward setup that achieved the first successful transmission?

Answer

Vibrating reeds and a liquid contact

Despite the patent application describing a broad range of methods, the actual apparatus that resulted in the first successful call was remarkably straightforward, utilizing vibrating reeds and a liquid contact mechanism.

What specific apparatus was utilized in the physically straightforward setup that achieved the first successful transmission?

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Alexander Graham Bell's Telephone Prototype | Earth Science

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