In high school, I had an astronomer friend who liked to make his own telescopes. He learned how to make a telescope through a local planetarium, which included the skill of grinding and polishing mirrors. For beginners, the planetarium had a saying that the quickest way to make a 4-inch mirror is to make a 3-inch mirror first. The reasoning was based on two things. First, it takes a long time to grind and polish glass to make a mirror, and the larger the mirror, the longer it takes to grind. Second, the likelihood ...
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J. PainterPractical GitLab Serviceshttps://doi.org/10.1007/979-8-8688-0427-4_1919. Lights, Camera, Action!
Jeffrey Painter1
(1)
Sugar Grove, IL, USA
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