Benjamin Franklin is generally credited with the invention of bifocals. Historians
have produced some evidence to suggest that others may have come before ...
Bifocals are eyeglasses with an upper and lower half, the upper for distance, and
the lower for reading. Bifocals are commonly prescribed to people with ...
Adapted from the important key article by Dr. Charles Letocha, also the wonderful
book by Dr. John Levene and finally the comprehensive paper (yet ...
Benjamin Franklin invented the lightning rod - iron furnace stove - bifocal glasses
and odometer - sp Ben Franklin.
In 1784, Ben Franklin
glasses . 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. More »
Nov 6, 2013 ... bifocals benjamin franklin As Benjamin Franklin aged, his vision, which had
never been great, deteriorated even further. Like many of the ...
Some of his inventions, like bifocal glasses, are well-known, while others are
more obscure. Of the numerous inventions Franklin created, he did not patent a ...
Fascinating facts about the invention of Bifocals by Benjamin Franklin in 1760.
US statesman Benjamin Franklin has long been credited with the invention of
bifocal spectacle lenses, but whether this is historically accurate or merely a myth
Most people in colonial Pennsylvania were content to do their reading in a simple
wooden chair. Ben Franklin, on the other hand, insisted on kicking back in a ...