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Since many inventions are developed independently by more than one person, it is possible that the invention of bifocals may have been such a case. [3] John Isaac Hawkins, the inventor of trifocal lenses, coined the term bifocals in 1824 and credited Benjamin Franklin.
Benjamin FranklinFRS FRSA FRSE(January 17, 1706 [O.S.January 6, 1705][Note 1] – April 17, 1790) was an American polymath: a leading writer, scientist, inventor, statesman, diplomat, printer, publisherand political philosopher.[1] Among the most influential intellectuals of his time, Franklin was one of the Founding Fathers of the United ...
Franklin's electrostatic machine is a high-voltage static electricity - generating device used by Benjamin Franklin in the mid-18th century for research into electrical phenomena. Its key components are a glass globe which turned on an axis via a crank, a cloth pad in contact with the spinning globe, a set of metal needles to conduct away the ...
Benjamin Franklin is credited with the invention of the first pair of bifocals in the early 1760s, though according to the Library Company of Philadelphia, the first indication of Dr. Franklin wearing his double spectacles comes from a political cartoon printed in 1784.
The informative, well-framed and entertaining "Benjamin Franklin," premiering Monday on PBS, explores the life and times of our most colorful founder. Ben Franklin was the most famous American of ...
Historians have from time to time produced evidence to suggest that others may have preceded him in the invention; however, a correspondence between George Whatley and John Fenno, editor of The Gazette of the United States, suggested that Franklin had indeed invented bifocals, and perhaps 50 years earlier than had been originally thought. [52]
Title page of 1751 original publication. Experiments and Observations on Electricity is a treatise by Benjamin Franklin based on letters that he wrote to Peter Collinson, who communicated Franklin's ideas to the Royal Society. [1] [2] The letters were published as a book in England in 1751, and over the following years the book was reissued in ...
A Franklin stove. The Franklin stove is a metal-lined fireplace named after Benjamin Franklin, who invented it in 1742. [ 1] It had a hollow baffle near the rear (to transfer more heat from the fire to a room's air) and relied on an "inverted siphon" to draw the fire's hot fumes around the baffle. [ 2]
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