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Freeware from Sky & Telescope

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Cool
Sample screen from Cool.

Cool

In the Telescope Techniques department in the January 2002 issue of Sky & Telescope (PDF of article) Alan Adler explains how forcing airflow over the primary mirror of a Newtonian reflector dramtically improves performance. The article features a DOS program called Cool that models the effects of different thermal situations. You can download it here. Be sure to select "Save program to disk" when prompted.

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