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What practical device is a precursor to the electric doorbell that Joseph Henry invented?

  • Electric toaster

  • Bell that could be rung at a distance via an electric wire, 1831

  • Electric light bulb

  • Electric fan

Answer

A bell that could be rung at a distance via an electric wire was a precursor to the electric doorbell that Joseph Henry invented in 1831. Henry's invention used an electromagnet to ring the bell, and it was a major step in the development of electrical doorbells.
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