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The 17th-century claim by Francesco Redi that Salvino degli Armati of Florence invented eyeglasses in ... invented bifocals, and perhaps 50 years ... George Airy in ...
Historians have produced some evidence to suggest that others may have come before 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. [2]
The process was first discovered by George Ravenscroft in 1674, who was the first to produce clear lead crystal glassware on an industrial scale. Ravenscroft had the cultural and financial resources necessary to revolutionise the glass trade, allowing England to overtake Venice as the centre of the glass industry in the eighteenth and ...
The first half of the 18th century saw British optician Edward Scarlett perfect temple eyeglasses which would rest on the nose and the ears. The innovations presented by Scarlett would not only spark some to look at aesthetic customization of eyewear for fashion within Europe but also lead Benjamin Franklin to invent bifocals in colonial America. [12]
In 1848 Airy invented the reflex zenith tube to replace the zenith sector previously employed. At the end of 1850 the great transit circle of 203 mm (8.0 in) aperture and 3.5 metres (11 feet 6 inches) focal length was erected, and is still the principal instrument of its class at the observatory.
Sunglasses or sun glasses ... Shutter shades were invented in the late 1940s, ... Jerry Garcia, Boy George, Liam Gallagher, Suggs, Ozzy Osbourne, Duckie ...
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The early writers discussed here treated vision more as a geometrical than as a physical, physiological, or psychological problem. The first known author of a treatise on geometrical optics was the geometer Euclid (c. 325 BC–265 BC).