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Mazda brand bulbs at the Edison and Ford Winter Estates Edison Mazda light bulb tester, logo by Maxfield Parrish, at the Corning Museum of Glass. Mazda was a trademarked name registered by General Electric (GE) in 1909 for incandescent light bulbs. The name was used from 1909 to 1945 in the United States by GE and Westinghouse. Mazda brand ...
Manufacturers may "season" new lamps to check for such defects before sale. Since a metal-halide lamp contains gases at a significant high pressure (up to 3.4 atmospheres), failure of the arc tube is inevitably a violent event. Fragments of arc tube will break the outer bulb, and hot glass fragments may fall on people or objects below.
In the 1970s, 34-watt energy-saving F40T12 fluorescent lamps were intoroduced in the United States. In the 1980s, T8 32-watt lamps were introduced, [8] but unlike the T8 tubes introduced in Europe, these T8s are not retrofits and require new matching ballasts to drive them. These ballasts were originally magnetic, but most today are electronic.
The Hubert H. Humphrey Metrodome (commonly called the Metrodome) was a domed sports stadium in downtown Minneapolis, Minnesota.It opened in 1982 as a replacement for Metropolitan Stadium, the former home of the National Football League's (NFL) Minnesota Vikings and Major League Baseball's (MLB) Minnesota Twins, and Memorial Stadium, the former home of the Minnesota Golden Gophers football team.
In 1974, Grote was batting .287 with four home runs and 27 RBIs when he earned his second All-Star selection. Injuries began to take their toll and he split catching duties with Duffy Dyer. [5] [36] Grote rebounded in 1975, posting a career-high .295 batting average in 119 games and led all National League catchers with a .995 fielding percentage.
Light bulbs using coiled coil filaments are sometimes referred to as 'double-coil bulbs'. For a 60-watt 120-volt lamp, the uncoiled length of the tungsten filament is usually 580 millimetres (22.8 in), [77] and the filament diameter is 0.046 millimetres (0.0018 in). The advantage of the coiled coil is that evaporation of the tungsten filament ...