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2. Cap lamp - Wikipedia

   en.wikipedia.org/wiki/Cap_lamp

   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 ...

3. History of street lighting in the United States - Wikipedia

   en.wikipedia.org/wiki/History_of_street_lighting...

   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.

4. William Sidney "Cap" Light - Wikipedia

   en.wikipedia.org/wiki/William_Sidney_"Cap"_Light

   William Sidney "Cap" Light was a Texas lawman from 1884 until his death in 1893, when he accidentally shot himself. He had a shining reputation, except for the period (1891–1892) when he worked for his brother-in-law, the infamous badman, Soapy Smith in Denver and Creede, Colorado .

5. Train lights - Wikipedia

   en.wikipedia.org/wiki/Train_lights

   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.

6. Bayonet mount - Wikipedia

   en.wikipedia.org/wiki/Bayonet_mount

   A bayonet mount A bayonet mount before and after insertion Early-19th century socket bayonet Socket of a bayonet. A bayonet mount (mainly as a method of mechanical attachment, such as fitting a lens to a camera using a matching lens mount) or bayonet connector (for electrical use) is a fastening mechanism consisting of a cylindrical male side with one or more radial pegs, and a female receptor ...