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A comment on Telescope Building with John Dobson (2014) [video].
http://wiki.c2.com/?TelescopeRule
Telescope Rule
Thomson's Rule for First-Time Telescope Makers: "It is faster to make a four-inch mirror then a six-inch mirror than to make a six-inch mirror."
-- Programming Pearls, Communications of the ACM, September 1985
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http://wiki.c2.com/?TelescopeRule
Telescope Rule
Thomson's Rule for First-Time Telescope Makers: "It is faster to make a four-inch mirror then a six-inch mirror than to make a six-inch mirror."
-- Programming Pearls, Communications of the ACM, September 1985