In Bell's early liquid transmitter design, what component directly manipulated the electrical current?

Answer

A plate attached to the diaphragm dipping into slightly acidic water

The diaphragm’s vibration caused a mechanically linked plate to move in and out of slightly acidic water, which altered the resistance of the liquid pathway, thereby modulating the electric current.

In Bell's early liquid transmitter design, what component directly manipulated the electrical current?

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Alexander Graham Bell's Telephone Prototype | Earth Science

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