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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's Inventions - USHistory.org

www.ushistory.org/franklin/info/inventions.htm

Benjamin Franklin's Inventions, Discoveries, and Improvements. Bifocals ... Franklin did not, of course, invent electricity, but he discovered many things about it, ... for the sole Vending of them for a Term of Years; but I declin'd it from a Principle ...

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

www.college-optometrists.org/en/college/museyeum/online_exhibitions/artgallery/bifocals.cfm

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; ...

Inventions and Achievements of Benjamin Franklin - Inventors

inventors.about.com/od/fstartinventors/ss/Franklin_invent.htm

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 Bifocals

benjaminfranklinbio.com/bifocals-benjamin-franklin/122/

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

www.pbs.org/benfranklin/l3_inquiring_little.html

Of the numerous inventions Franklin created, he did not patent a single one. ... to create a truly efficient model, which became known as the Franklin stove.

Bifocal Glasses History - Invention of Bifocal Glasses

www.ideafinder.com/history/inventions/bifocals.htm

Fascinating facts about the invention of Bifocals by Benjamin Franklin in 1760. ... Glass lenses, for use as magnifiers or for starting fires, date to about 300 BC, but the first eyeglasses to aid or correct vision were almost certainly invented in ...

Ben Franklin's best inventions and innovations - Constitution Daily

blog.constitutioncenter.org/2013/01/ben-franklins-best-inventions-and-innovations/

Jan 17, 2013 ... In his day, Benjamin Franklin was Steve Jobs, Thomas Edison, Mark Zuckerberg, and ... Invention or innovation: Bifocals (date unconfirmed). Historically, Franklin has been credited with inventing bifocals late in his life, as he ...

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 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 ...

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Benjamin Franklin-Father of the Bifocal - Antique Spectacles

www.antiquespectacles.com

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 ...

When did Benjamin Franklin invent bifocals? | Reference.com

www.reference.com

Benjamin Franklin invented bifocals in 1784. ... How did Benjamin Franklin change the world? A: Benjamin ... In what year was the hair straightener invented ? Q: ...

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.