The Inventions and Scientific Achievements of Benjamin Franklin

In 1784, Ben Franklin developed bifocal glasses. He was getting old and was having trouble seeing both up-close and at a distance. Getting tired of switching between two types of glasses, he devised a way to have both types of lenses fit into the frame. The distance lens was placed at the top and the the up-close lens was placed at the bottom.

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• Benjamin Franklin - Armonica
• Benjamin Franklin - Franklin Stove
• Benjamin Franklin - Lightening Rod
• Benjamin Franklin - Bifocals
• Benjamin Franklin - Map of Gulf Stream
• Benjamin Franklin - Daylight Savings Time
• Benjamin Franklin - Odometer

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