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The air conditioning units that the Boston cars were delivered with had problems such as sucking up dust and other debris from the subway tunnels and were later replaced with roof-mounted Sutrak air conditioners in the late-1980s to mid-1990s.
An induction furnace is an electrical furnace in which the heat is applied by induction heating of metal. [ 1 ] [ 2 ] [ 3 ] Induction furnace capacities range from less than one kilogram to one hundred tons, and are used to melt iron and steel , copper , aluminum , and precious metals .
Hush kit for the Pratt and Whitney JT8D-1 through -17 engines Two JT4As installed on a KLM DC-8. A hush kit is an aerodynamic device used to help reduce the noise produced by older aircraft jet engines. These devices are typically installed on older turbojet and low-bypass turbofan engines, as they are much louder than later high-bypass ...
This oxygen reacts with the metal, producing more heat and forming an oxide which is then blasted out of the cut. It is the heat that continues the cutting process. The cutting torch only heats the metal to start the process; further heat is provided by the burning metal. The melting point of the iron oxide is around half that of the metal ...
An illustration of furnace bellows operated by waterwheels from the Nong Shu, by Wang Zhen in 1313 during China's Yuan dynasty A Chinese fining and blast furnace in Tiangong Kaiwu, 1637 Cast iron has been found in China dating to the 5th century BC, but the earliest extant blast furnaces in China date to the 1st century AD and in the West from ...
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