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 How did Benjamin Franklin invent bifocals?

Answer Benjamin Franklin needed glasses most of his life. The problem was that he had to change from one pair of glasses to the other when he wanted to see near or far. To solve the problem, he invented w... Read More »
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Top Q&A For: How did Benjamin Franklin invent bifocals

What about Benjamin Franklin is he the first to invent ovens?

A refrigerator compressor is the center of the refrigeration cycle. It works as a pump to control the circulation of the refrigerant, and it adds pressure to the refrigerant, heating it up. The com... Read More »
http://wiki.answers.com/Q/What_about_Benjamin_Franklin_is_he_the_first_to_invent_ovens

How many inventions did Benjamin Franklin invent?

Benjamin Franklin didn't patent his inventions, so we can't definitively list them. Nonetheless, he designed at least nine inventions--an arm extension, bifocals, the catheter, the Franklin stove, ... Read More »
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When did Benjamin Franklin invent bifocals?

Famed inventor, statesman and founding father Benjamin Franklin invented bifocals in 1784. Franklin, who at the age of 79 wore spectacles, conceived of the idea when he grew tired of having to swap... Read More »
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When did Benjamin Franklin invent the lighting rod?

Benjamin Franklin came up with the idea for his lightning rod in 1750, but he didn’t finish perfecting it until 1753. Lightning rods divert electricity from lightning into the ground, so it doesn... Read More »
http://www.answerbag.com/q_view/2398558


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