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The Green Line, operated by the MBTA, is a light rail system with an underground section in Boston. To replace the PCC cars that had been used for many years, the US Standard Light Rail Vehicle (USSLRV) manufactured by Boeing Vertol was introduced in 1976. However, problems frequently occurred in various parts such as the door, air conditioning ...
A pantograph is a commonly used overhead suspension system for lamps and audio and video monitors in television studios. It is also used on a smaller scale in many photography studios. Using either motor driven cables or a spring system, the pantograph can be balanced so that a light touch can readjust the height of the load (usually a lamp).
The diamond-shaped, electric-rod pantograph of the Swiss cogwheel locomotive of the Schynige Platte railway in Schynige Platte, built in 1911 Cross-arm pantograph of a Toshiba EMU. A pantograph (or "pan" or "panto") is an apparatus mounted on the roof of an electric train, tram or trolley buses [1] to collect power through contact with an ...
Wint-O-Green Life Savers work especially well for creating such sparks, because wintergreen oil (methyl salicylate) is fluorescent and converts ultraviolet light into blue light. [ 17 ] [ 18 ] A diamond may begin to glow while being rubbed; this occasionally happens to diamonds while a facet is being ground or the diamond is being sawn during ...
It can show a green aspect (the next signal is open without restrictions), double yellow (the next signal is at the stop aspect), green-yellow horizontal (the next signal requires a speed reduction) or green-yellow vertical (double warning in the case of a short section between the next signal and the signal after that, which has a red aspect ...
The short arms (green) stay parallel. One spring puts pull force on the blue arm. (If the blue arm is tilted back the second spring on this arm gets push force.) The blue arm controls the two parallel arms (red) that make up the upper arm. The other spring puts pull force on the other blue arm. This arm controls the forearm (magenta).
Steady checkered lights denote command and control vehicles – these are red and white for fire (one of the few situations where a forward-facing red light may be shown), blue and white for police and green and white for ambulance, [93] and are often fitted in the middle of the light bar. Civil enforcement vehicles also use red lights in ...
Green waves are sometimes used to facilitate bicycle traffic. Copenhagen, [4] Amsterdam, [5] San Francisco, [6] and other cities may synchronize traffic signals to provide a green light for a flow of cyclists. On San Francisco's Valencia Street, the signals were retimed in early 2009 to provide a green wave in both directions, possibly the ...