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Bifocals

en.wikipedia.org/wiki/Bifocals

Bifocals are eyeglasses with two distinct optical powers. Bifocals are commonly prescribed to ... Benjamin Franklin is generally credited with the invention of bifocals. ... of The Gazette of the Un...

Benjamin Franklin-Father of the Bifocal

www.antiquespectacles.com/topics/franklin/franklin.htm

In 1990 the year of the bicentennial celebration of Benjamin Franklin's death ..... “ It seems most likely that Benjamin Franklin did invent bifocals, most likely when ...

Benjamin Franklin's contributions to science - USHistory.org

www.ushistory.org/franklin/science/

Benjamin Franklin's inventions, innovations and discoveries including the kite experiment, Franklin stove, bifocals, armonica and more.

Inventions and Achievements of Benjamin Franklin - Inventors

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Benjamin Franklin invented the lightning rod - iron furnace stove - bifocal ... Franklin's armonica, created in 1761, was smaller than the originals and did not ...

Benjamin Franklin Inventions - The American Revolutionary War

www.revolutionary-war.net/benjamin-franklin-inventions.html

Bifocals. Benjamin Franklin was always faced with a problem of vision. ... Contrary to popular opinion, Benjamin Franklin did not invent or discover electricity.

Ben Franklin Glasses - Ben Franklin Spectacles | Benjamin Franklin

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Nov 6, 2013 ... On bifocals, Benjamin Franklin assured his vision-impaired friends that they would enjoy and possibly extend the later years of their life with ...

BENJAMIN FRANKLIN INVENTIONS - bifocals, lightning rod and ...

www.inventor-strategies.com/Benjamin-Franklin-Inventions.html

When Franklin was a postmaster he had to organize routes for efficient mail delivery. He needed to know distances and traveling times, so he invented a gadget ...

Benjamin Franklin . Inquiring Mind . It's the Little Things | PBS

www.pbs.org/benfranklin/l3_inquiring_little.html

Some of his inventions, like bifocal glasses, are well-known, while others are more ... Of the numerous inventions Franklin created, he did not patent a single one. ... Three-wheel clock: Franklin invented a 24-hour, three-wheel clock that was ...

Ben Franklin and the Bifocal | Medgadget

www.medgadget.com/2005/07/ben_franklin_an.html

Jul 22, 2005 ... Glass lenses, for use as magnifiers or for starting fires, date to about 300 BC, ... to aid or correct vision were almost certainly invented in 1280 in Florence, ... Bifocal spectacles were described in Franklin's in a further letter to ...

Benjamin Franklin Invented Bifocals - Fact or Myth?

factmyth.com/factoids/benjamin-franklin-invented-bifocals/

Jul 7, 2016 ... Did Benjamin Franklin Invent the Bifocal? ... in 1785; a letter written by a friend in 1789 claims that he had used them for the past 50 years.

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When did Benjamin Franklin invent bifocals? | Reference.com

www.reference.com

Benjamin Franklin invented bifocals in 1784. As announced in a ... How did Benjamin Franklin change the world? ... What year was the curling iron invented? Q: ...

The 'inventor' of bifocals? - The College of Optometrists

www.college-optometrists.org

Why it is wrong to say Benjamin Franklin 'invented' bifocals. ... It should be noted that he did not describe them as 'my' invention, nor should the wording ... spectacles over many years: 'He informed me that he had worn spectacles for 50 years; ...

Benjamin Franklin FAQ | The Franklin Institute

www.fi.edu

After less than a year, for financial reasons, Ben transferred to Mr. George Brownell's school ... What did Benjamin Franklin want to be when he grew up? ... from both pairs in half, then put half of each lens in a single frame, inventing bifocals.