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2. Solar water heating - Wikipedia

   en.wikipedia.org/wiki/Solar_water_heating

   An advertisement for a Solar Water Heater dating to 1902 Frank Shuman's sunengine on the March 1916 cover of Hugo Gernsback's The Electrical Experimenter. Records of solar collectors in the United States date to before 1900, [5] involving a black-painted tank mounted on a roof. In 1896 Clarence Kemp of Baltimore enclosed a tank in a wooden box ...

3. Solar dial - Wikipedia

   en.wikipedia.org/wiki/Solar_dial

   A solar dial is a type of time switch used primarily for controlling lighting. [ 1 ] The benefit of a solar dial over a conventional 'on-off' time switch is the ability to 'track' the sunrise and sunset times for a particular latitude (which is specified when the unit is purchased).

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   AOL latest headlines, entertainment, sports, articles for business, health and world news.