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  2. Color wheel (optics) - Wikipedia

    en.wikipedia.org/wiki/Color_wheel_(optics)

    A common application of the color wheel is to provide a color filter for a single-chip projector, which would otherwise only be able to display a greyscale image. The color wheel is placed in front of the light source (usually a metal-halide lamp) and spins rapidly, splitting the light into red, green, and blue primary colors. The chip then ...

  3. Rubber-tyred metro - Wikipedia

    en.wikipedia.org/wiki/Rubber-tyred_metro

    The return current passes via a return shoe to one or both of the conventional railway tracks, which are part of most systems, or to the other guide bar. Sapporo Subway guide rail and flat steel roll ways. Rubber tyres have higher rolling resistance than traditional steel railway wheels. There are some advantages and disadvantages to increased ...

  4. Train inspection system - Wikipedia

    en.wikipedia.org/wiki/Train_inspection_system

    A laser wheel profile detector. Laser and optical scanning wayside inspection devices (known as TBOGI—Truck Bogie Optical Geometry Inspection Systems) make images of the flange and tread. These measurements are compared with acceptable dimensions. When worn beyond limits, the wheels are scheduled for replacement.

  5. List of New York City Subway R-type contracts - Wikipedia

    en.wikipedia.org/wiki/List_of_New_York_City...

    Two wheel truing machines R25 One wheel truing machine R26: Passenger cars 7750–7859 American Car & Foundry 1959–1960 Retired, 7774–7775 preserved R27: 8020–8249 St. Louis Car 1960–1961 Retired R28: 7860–7959 American Car & Foundry 1960–1961 Retired, 7924–7927 preserved R29: 8570–8805 St. Louis Car 1962 Retired, 8678–8679 ...

  6. Color wheel - Wikipedia

    en.wikipedia.org/wiki/Color_wheel

    A color wheel or color circle [1] is an abstract illustrative organization of color hues around a circle, which shows the relationships between primary colors, secondary colors, tertiary colors etc. Some sources use the terms color wheel and color circle interchangeably; [ 2 ] [ 3 ] however, one term or the other may be more prevalent in ...

  7. Why did no one help her? Fatal subway burning exposes New ...

    www.aol.com/news/why-did-no-one-help-235827542.html

    Subway surveillance images show Sebastian Zapeta-Calil leaving the car as the woman burns to death. Surely, someone would have thrown their coat over her, ran to look for water, screamed at her to ...