Alexander Graham Bell was an electrical mastermind. He was always looking for a challenge even after many inventions. Another one of his famous inventions was the liquid transmitter. The working theory of Bell's Liquid transmitter is pretty straightforward. A wire that is connected to the bottom of the parchment diaphragm is supposed to slightly touch the water. The purpose was to create an electrical current with a very small amount of acid. The words would be spoken on the top of the diaphragm causing it to flex up and down. By doing that the attached wire has more or less contact with the water, therefore to transform the circuit resistance.The example below is a demonstration of that.
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