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SlideshowReport

Rotating Furnace for Making Parabolic Telescope Mirrors

Description
(a) To make each 8.4-m primary mirror for the Large Binocular Telescope II on Mount Graham in
Arizona, 40,000 pounds of glass are loaded into a rotating furnace and heated to 1450 K (2150°F).
This image shows glass fragments loaded into the cylindrical furnace
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