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texereau ch 2, page 34

The gap of sphericity can exceed 2/10 of a millimeter on a mirror of 20 centimeters, it must be remembered has complete roughing by a slower method but catching this defect.
It's not difficult, just keep working with racing roughly CENTERED
as in Figure 18 B, but with a total range of motion not exceeding this time disk diameter of half

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沖田博文 Hirofumi Okita 60cm F3.25 dobsonian telescope

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