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  2. Sight glass - Wikipedia

    en.wikipedia.org/wiki/Sight_glass

    Sight glass. Water gauge on a steam locomotive. Here the water is at the “top nut”, the maximum working level. Note the patterned backplate to help reading and toughened glass shroud. A sight glass or water gauge is a type of level sensor, a transparent tube through which the operator of a tank or boiler can observe the level of liquid ...

  3. Atmospheric refraction - Wikipedia

    en.wikipedia.org/wiki/Atmospheric_refraction

    Diagram showing displacement of the Sun 's image at sunrise and sunset. Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of height. [1] This refraction is due to the velocity of light through air decreasing ...

  4. Annunciator panel - Wikipedia

    en.wikipedia.org/wiki/Annunciator_panel

    Annunciator panel. An annunciator panel, also known in some aircraft as the Centralized Warning Panel (CWP) or Caution Advisory Panel (CAP), is a group of lights used as a central indicator of status of equipment or systems in an aircraft, industrial process, building or other installation. Usually, the annunciator panel includes a main warning ...

  5. Insulated glazing - Wikipedia

    en.wikipedia.org/wiki/Insulated_glazing

    EURO 68 wooden window profile with insulated glazing. Insulating glass (IG) consists of two or more glass window panes separated by a space to reduce heat transfer across a part of the building envelope. A window with insulating glass is commonly known as double glazing or a double-paned window, triple glazing or a triple-paned window, or ...

  6. Glaucoma - Wikipedia

    en.wikipedia.org/wiki/Glaucoma

    Glaucoma is a group of eye diseases that lead to damage of the optic nerve, which transmits visual information from the eye to the brain. Glaucoma may cause vision loss if left untreated. It has been called the "silent thief of sight" because the loss of vision usually occurs slowly over a long period of time. [5]

  7. Willet Hauser Architectural Glass - Wikipedia

    en.wikipedia.org/wiki/Willet_Hauser...

    Willet Hauser Architectural Glass, Inc is a North American stained glass firm located in Winona, Minnesota, that specializes in the design, fabrication, preservation and restoration of leaded stained glass and faceted glass windows. The studio, one of the oldest in North America, was formed through the merger of two American stained glass ...

  8. Plasma window - Wikipedia

    en.wikipedia.org/wiki/Plasma_window

    A plasma window's viscosity allows it to separate gas at standard atmospheric pressure from a total vacuum, and can reportedly withstand a pressure difference of up to nine atmospheres. [2] At the same time, the plasma window will allow radiation such as laser beams and electron beams to pass. This property is the key to the plasma window's ...

  9. List of refractive indices - Wikipedia

    en.wikipedia.org/wiki/List_of_refractive_indices

    List of refractive indices. Refraction at interface. Many materials have a well-characterized refractive index, but these indices often depend strongly upon the frequency of light, causing optical dispersion. Standard refractive index measurements are taken at the "yellow doublet" sodium D line, with a wavelength (λ) of 589 nanometers.

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