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1876 – Alexander Graham Bell made what was, in effect, the first telephone call. He found a way of converting words into electrical current and back again and sent his first message using his new variable-liquid resistance transmitter. Bell’s telephone caused the current to vary smoothly in proportion to the pressure created on a microphone by human speech and got a patent. His assistant, in an adjoining room in Boston, heard Bell say over the experimental device: “Mr. Watson, come here, I want to see you.” On a page from his notebook, dated March 10, 1876, Alexander Graham Bell described the first successful experiment with the telephone. Bell wrote: “I then shouted into M (the mouthpiece) the following sentence: ‘Mr. Watson—come here—I want to see you.’ To my delight he came and declared that he had heard and understood what I said.”

This is from today's list of what happened in US Military History.