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While typical clear float glass blocks approximately 45% of UV radiation, the addition of CeOx to glass [16] has been shown to further reduce UV transmission as well as widespread use of organic UV blocking dyes in the production of acrylic substrates. [17] Most soda-lime glass completely absorbs short wavelength UV-B radiation below 300 nm.
Using the daguerreotype process, John Benjamin Dancer was one of the first to produce microphotographs, in 1839. [1] He achieved a reduction ratio of 160:1. Dancer refined his reduction procedures with Frederick Scott Archer's wet collodion process, developed in 1850–51, but he dismissed his decades-long work on microphotographs as a personal hobby and did not document his procedures.
Stringer pallets are one of the original models of wooden pallets. They use a frame of three or more parallel pieces of timber (called stringers). The top deckboards are then affixed to the stringers to create the pallet structure. Stringer pallets can have a notch cut into them allowing "four-way" entry.
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The earliest clear illustrations of the spinning wheel come from the Islamic world in the eleventh century. [29] The earliest unambiguous reference to a spinning wheel in India is dated to 1350, suggesting that the spinning wheel was likely introduced from Iran to India during the Delhi Sultanate .
Suzuki GSX-R250 – a motorcycle that was manufactured from 1987 to 1994. A couple of years after the presentation of the GSX-R750 the 250 cc GSX-R250 was released. Like the larger bike, the GSX-R250 had a box-frame (steel, not aluminum), full fairing, full-floater rear swing and a four-cylinder four-stroke engine.