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The second category of furnace is the forced-air having atmospheric burner style with a cast-iron or sectional steel heat exchanger. Through the 1950s and 1960s, this style of furnace was used to replace the big, natural draft systems, and was sometimes installed on the existing gravity duct work.
In the 20th century, the US industry successively adopted the open hearth furnace, then the basic oxygen steelmaking process. Since the American industry peaked in the 1940s and 1950s, the US industry has shifted to small mini-mills and specialty mills, using iron and steel scrap as feedstock, rather than iron ore.
A central heating system has a furnace that converts fuel or electricity to heat. The heat is circulated through the building either by fans forcing heated air through ducts, circulation of low-pressure steam to radiators in each heated room, or pumps that circulate hot water through room radiators.
Salamander heaters date back to at least 1915. In the early 1940s, W.L. Scheu of Scheu Manufacturing Company, a producer of temporary portable space heating equipment, developed the modern salamander heater to provide warmth to allow construction crews to work in inclement weather. Sales spread across the US, and by the 1950s, to Europe.
The Duluth Works featured a ten-furnace open hearth steel production facility, two blast furnaces, 110 oven byproduct coke plant, a benzole and toluol plant, a byproducts refinery, coal and coke conveyors and crushing and sizing towers, a pig iron casting facility, a blowing house powerhouse, a Heine boiler house, fresh water pumping inlet ...
The Globe Hotel building on Lake Road in Congers was built next to Congers Station, which was used for passenger travel until the 1950s. The hotel building is now retail space and apartments.
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