The same technique is used in rotating furnaces to make solid reflectors.
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Devices for constructing such paraboloids are known as rotating furnaces.
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After reverberatory and rotating furnaces the recovery boiler was on its way.
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The same technique is used to make solid paraboloids, in rotating furnaces.
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The assembly ( or rotating furnace ) is then heated while spun at slow speed until the glass is liquid, then gradually cooled over a period of months.
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Accurate off-axis reflectors, for use in telescopes, can be made quite simply by using a rotating furnace, in which the container of molten glass is offset from the axis of rotation.
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Steward's Mirror Laboratory ( SOML ), located under the east side of Arizona Stadium, has pioneered new techniques of large mirror production, including spin-casting lightweight honeycomb mirrors in a rotating furnace, and stressed-lap polishing.
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Molten glass is rotated to make its surface paraboloidal, and is kept rotating while it cools and solidifies . ( See Rotating furnace . ) The resulting mirror shape approximates a desired paraboloid shape that requires minimal grinding and polishing to reach the exact figure needed.
9.
A "'rotating furnace "'is a device for making solid objects which have concave surfaces that are segments of Newton, that the centrifugal-force-induced shape of the top surface of a spinning liquid is a concave paraboloid, identical to the shape of a reflecting telescope's primary focusing mirror.
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