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Photosensitive glass vase. Photosensitive glass, also called photostructurable glass (PSG) or photomachinable glass, is a glass in the lithium-silicate family of glasses onto which images can be etched using shortwave radiations, such as ultraviolet. [1] Photosensitive glass was first discovered by S. Donald Stookey in 1937. [2] [3] [4]
In 1913, Crookes lenses [17] were introduced, [18] made from glass containing cerium, which completely blocked ultraviolet light. [19] [20] In the early 1920s, the use of sunglasses started to become more widespread, especially among movie stars. Inexpensive mass-produced sunglasses made from celluloid were first produced by Sam Foster in 1929.
The first reported metallic glass was an alloy (Au 75 Si 25) produced at Caltech by W. Klement (Jr.), Willens and Duwez in 1960. [3] This and other early glass-forming alloys had to be cooled extremely rapidly (in the order of one mega-kelvin per second, 10 6 K/s) to avoid crystallization.
It’s the same process that produces energy in stars, including the sun. Since our first, very brief successful attempt at fusion, more than 70 years ago, its promise of clean, cheap, and ...
Some high-end sun glass brands can come with anti-scratch coating. There can be steps implemented to protect the sunglasses and prevent scratching or damage. Clean the sunglasses regularly using sunglasses cleaning products like a microfiber cloth, or a sun glass cleaner. Avoid leaving your sunglasses in extreme heat or cold, like a car.
AN6531 sunglasses with Type 1 AN6531 lenses made by American Optical. In the second half of the 1930s and early 1940s, a group of American firms continued developing sunglasses. The military "flying sun glasses (comfort cable)" were standardized in November 1941. They were produced in huge quantities (several million pieces) for pilots and sailors.