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At the top right corner is a monocular for assisting the alignment of the two heads. Free-space optical communication (FSO) is an optical communication technology that uses light propagating in free space to wirelessly transmit data for telecommunications or computer networking. "Free space" means air, outer space, vacuum, or something similar.
A light shelf is a horizontal surface that reflects daylight deep into a building. Light shelves are placed above eye-level and have high-reflectance upper surfaces, which reflect daylight onto the ceiling and deeper into the space. Light shelves are typically used in high-rise and low-rise office buildings, as well
The history of electric light is well documented, [11] and with the developments in lighting technology the profession of lighting developed alongside it. The development of high-efficiency, low-cost fluorescent lamps led to a reliance on electric light and a uniform blanket approach to lighting, but the energy crisis of the 1970s required more design consideration and reinvigorated the use of ...
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The focal plane of the light was 46 metres (151 ft) above high water mark and visibility horizon was 29 kilometres (18 mi). [1] The light was first exhibited on 15 November 1903. The original light was on 438,000 candle power. The cost of the optical apparatus in 1901 was A£5,000. On 13 April 1923, the concentric wick burner inside the lens ...
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