Polaroid (polarizer) Polaroid (polarizer) Polaroid is a type of synthetic plastic sheet which is used as a polarizer or polarizing filter. A trademark of the Polaroid Corporation, the term has since entered common use. The original material, patented in 1929 and further developed in 1932 by Edwin H. Land, consists of many microscopic crystals of iodoquinine sulphate (herapathite) embedded in a transparent nitrocellulose polymer film. The needle-like crystals are aligned during manufacture of the film by stretching or by applying electric or magnetic fields. With the crystals aligned, the sheet is dichroic: it tends to absorb light which is polarized parallel to
Polaroid Eyewear Leven in Scotland, a few years later in 1972 the production of sunglasses was added. It promotes a number of programs in the community on the health theme. Polaroid is the major sponsor of a series of 10K road races, which take place each June over various courses in west Dunbartonshire. In the next decades other plants were opened in Europe, South America and Far East. In the 1960s the designer Oleg Cassini collaborated with Cool Ray and his influence is clear in many Polaroid models. In the 1980s Polaroid launched aviator styles with interchangeable lenses in collaboration with tennis