Physics
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985s%26t....70....7m&link_type=abstract
Sky and Telescope (ISSN 0037-6604), vol. 70, July 1985, p. 7-9.
Physics
1
Casting, Mirrors, Ovens, Spin Glass, Telescopes, Coriolis Effect
Scientific paper
Attention is given to the configuration and control systems of a rotating high temperature furnace that has been designed for the casting and figuring to parabolic shape of large, lightweight borosilicate glass telescope mirrors. The mirrors, which may be as much as 8 m in diameter, have a hexagonal cell honeycomb structure that rapidly enters into thermal equilibrium with observatory ambient air to minimize thermal distortion. As the oven rotates, the molten glass in the honeycomb mold flows centrifugally and creates a parabolid upper surface; upon cooling over the course of three days, the mirror will retain an optically perfect surface that can be directly silvered. The mirror fabrication time and cost reductions achieved are judged to be revolutionary.
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