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The Arithmometer was invented by Charles Xavier Thomas de Colmar. It was the first reliable calculator. I could add, subtract, multiply and divide.
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William Sturgeon invented the first modern compass. It used an the electromagnetic he also invented. Compasses had been used for centuries but this was the first one like it.
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Joseph Henry invented the first telegraph that actually worked. His work with electromagnetism is what finally made it all click. The actual work with the telegraph began in 1775.
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The American Telephone and Telegraph Company was founded. It was the parent company for the Bell System. They built telephone lines for long distance.
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Emile Berliner invented the carbon microphone. He worked with Thomas Edison. He sold his patent to the Bell Telephone Company for $50,000.