Invented by Nathan Stubblefield in 1908, the device came complete with an unwieldy metal transmitter.
A far cry from the tiny mobile phones in use today, the telephone was made up of a system of wire suspended between metal rods with the transmitter placed on a train carriage or boat.
When the vehicle neared, a signal was sent through the air to the telephone using magnetic fields. It could be heard near the other end of the wire through another phone.
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