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The dandy's quizzing glass of the 1790s was an article of high fashion, [1] which differs from the monocle in being held to one's eye with a handle in a fashion similar to a lorgnette, rather than being held in place by the eye socket itself.
The magnifying power in this case is roughly MP = d o Φ. [9] A typical magnifying glass might have a focal length of 25 cm, corresponding to an optical power of 4 dioptres. Such a magnifier would be sold as a "2×" magnifier. In actual use, an observer with "typical" eyes would obtain a magnifying power between 1 and 2, depending on where lens ...
Stanhope lens with case, early 1800s. A Stanhope lens is a simple, one-piece microscope invented by Charles, the third Earl of Stanhope.It is a cylinder of glass with each end curved outwards, one being more convex than the other.
It has been proposed that glass eye covers in hieroglyphs from the Old Kingdom of Egypt (c. 2686–2181 BCE) were functional simple glass meniscus lenses. [40] The so-called Nimrud lens, a rock crystal artifact dated to the 7th century BCE, might have been used as a magnifying glass, although it could have simply been a decoration. [41] [42 ...
Blenko Glass Company is an art glass company that began producing in 1922 under the name Eureka Art Glass Company. The company name was changed to Blenko Glass Company in 1930. Originally an antique flat glass company, it was founded by Englishman William J. Blenko (1854-1933). Blenko came to the United States to make glass in 1893.
A Coddington magnifier is a magnifying glass consisting of a single very thick lens with a central deep groove diaphragm at the equator, thus limiting the rays to those close to the axis, which minimizes spherical aberration. This allows for greater magnification than a conventional magnifying glass, typically 10× up to 20×. Most single lens ...
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