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The two most recent variants of the cap lamp are the GEN 4 and GEN 5 models. The GEN 4 model, approved for use by the Mine Safety and Health Administration (MHSA), uses the headpiece of existing cap lamps, but retrofitted with new LEDs and electronics. The GEN 5 model is very similar to the GEN 4 model except with a more intense spot beam that ...
Wrought iron is an iron alloy with a very low carbon content (less than 0.05%) in contrast to that of cast iron (2.1% to 4.5%). It is a semi-fused mass of iron with fibrous slag inclusions (up to 2% by weight), which give it a wood-like "grain" that is visible when it is etched, rusted, or bent to failure.
In the US, street lights using sodium vapor were first installed on a rural highway near Port Jervis, New York, in 1933. [1] In 1938, a study of sodium vapor light use at selected intersections in Chicago claimed that the new lighting had helped to reduce the number of accidents in those areas.
The most universal type of light is the headlight, which is included on the front of locomotives, and frequently on the rear as well. [2] Other types of lights include classification lights, which indicate train direction and status, and ditch lights, which are a pair of lights positioned towards the bottom of a train to illuminate the tracks.
Tiger Toys also produced a cartridge version of Lights Out for its Game com handheld game console in 1997, shipped free with the console. A number of new puzzles similar to Lights Out have been released, such as Lights Out 2000 (5×5 with multiple colors), Lights Out Cube (six 3×3 faces with effects across edges), and Lights Out Deluxe (6×6 ...
Like other gas-discharge lamps such as the very-similar mercury-vapor lamps, metal-halide lamps produce light by ionizing a mixture of gases in an electric arc.In a metal-halide lamp, the compact arc tube contains a mixture of argon or xenon, mercury, and a variety of metal halides, such as sodium iodide and scandium iodide. [7]
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