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The infinity mirror (also sometimes called an infinite mirror) is a configuration of two or more parallel or angled mirrors, which are arranged to create a series of smaller and smaller reflections that appear to recede to infinity. [1] [2] Often the front mirror of an infinity mirror is half-silvered (a so-called one way mirror), but this is ...
Anti-fog agents were developed by NASA during the Project Gemini, for use on helmet visors.During Gemini 9A, in June 1966, Astronaut Eugene A. Cernan tested NASA's first space suit, and discovered during the space walk that his helmet visor fogged, among other issues. [2]
A fog display, fog screen, vapor screen or vapor display is a system that uses haze machines or water vapor to create a semi-transparent wall, or "curtain" of suspended particles which trapped in a thin sheet (laminar flow) of air and are illuminated by a projector, [1] in order to produce a display whose images seem to float in mid air. [2]
Standard door sizes in the US run along 2" increments. Customary sizes have a height of 78 or 80 in (2,000 or 2,000 mm) and a width of 18, 24, 26, 28, 30 or 36 in (460, 610, 660, 710, 760 or 910 mm). [24] Most residential passage (room to room) doors are 30 in × 80 in (760 mm × 2,030 mm).
The glass is then rapidly cooled with forced air drafts while the inner portion remains free to flow for a short time. An alternative chemical toughening process involves forcing a surface layer of glass at least 0.1 mm thick into compression by ion exchange of the sodium ions in the glass surface with potassium ions (which are 30% larger), by ...
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