electromagnet is a device in which magnetism is produced by an electric
British electrician, William Sturgeon
invented the electromagnet in 1825. The first electromagnet was a horseshoe-shaped
piece of iron that was wrapped with a loosely wound coil of several turns.
When a current was passed through the coil; the electromagnet became magnetized
and when the current was stopped the coil was de-magnetized. Sturgeon displayed
its power by lifting nine pounds with a seven-ounce piece of iron wrapped
with wires through which the current of a single cell battery was sent.
Sturgeon could regulate his electromagnet;
this was the beginning of using electrical energy for making useful and
controllable machines and laid the foundations for large-scale electronic
Five year later an inventor called
Joseph Henry - made a far more powerful version of the electromagnet. American,
Henry (1797-1878), demonstrated the potential of Sturgeon's device
for long distance communication by sending an electronic current over one
mile of wire to activate an electromagnet which caused a bell to strike.
Thus the electric telegraph was born.
Sturgeon : 1783 - 1850
Henry's Contributions to the Electromagnet and the Electric Motor
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