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Period: to
Thomas Edison
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Thomas Edison invented the telegraph.
One of Thomas's students came to his house one day, after the incident when he spilt sulferic acid on the floor. He then gave him the equipment to finish. -
Thomas Edison invented the phonograph.
It took him 30 hours to invent the phonograph. -
Thomas Alva Edison invented the lightbulb.
After many experiments with platinum and other elements, Edison returned to a carbon filament. Finally, it was a success. -
the old but moderately new lightbulb
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Modern day lightbulbs
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The things people did to modify the lightbulb
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Another lightbulb
