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  2. Fitchburg Furnace - Wikipedia

    en.wikipedia.org/wiki/Fitchburg_Furnace

    The furnace is the world's largest charcoal iron furnace and the last to be built in Kentucky. The structure was state of the art in its time. With core of the furnace consisted of twin stacks built of local sandstone using traditional dry laid stone masonry, and today is counted among the top dry masonry projects in the world.

  3. Eternal flame - Wikipedia

    en.wikipedia.org/wiki/Eternal_flame

    Nizhny Novgorod Kremlin eternal flame memorializing losses during World War II .. An eternal flame is a flame, lamp or torch that burns for an indefinite time. Most eternal flames are ignited and tended intentionally, but some are natural phenomena caused by natural gas leaks, peat fires and coal seam fires, all of which can be initially ignited by lightning, piezoelectricity or human activity ...

  4. Solar furnace - Wikipedia

    en.wikipedia.org/wiki/Solar_furnace

    The device, the Mont-Louis Solar Furnace is still in place at Mont-Louis. The Pyrenees were chosen as the site because the area experiences clear skies up to 300 days a year. [2] The Odeillo Solar Furnace is a larger and more powerful solar furnace. It was built between 1962 and 1968, and started operating in 1969.

  5. The time when a day on Earth was just 19 hours long - AOL

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  6. Athanor - Wikipedia

    en.wikipedia.org/wiki/Athanor

    Athanor. In alchemy, an athanor (Arabic: التنور, at-tannūr) is a furnace used to provide a uniform and constant heat for alchemical digestion.Etymologically, it descends from a number of Arabic texts of the period of the Caliphate which use the term "al-tannoor" in talismanic alchemy, meaning a bread-oven, from which the design portrayed evidently descends.

  7. Summer solstice: Everything you need to know about the ...

    www.aol.com/summer-solstice-everything-know...

    Your local time zone in relation to UTC determines the time and even the date that the solstice happens for you. For instance, that’s 1:51 p.m. in Los Angeles, 4:51 p.m. in New York City, 9:51 p ...

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