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Type: Posts; User: Anatol

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  1. Replies
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    Thanks to everyone for prompt and informative...

    Thanks to everyone for prompt and informative responses. Jerry (JST), the point about sphericity is well taken. I saw the possibility for toroidal sections but not sphericity. Silly me. Brain just...
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    Surface plates history and theory

    Hello Everyone.
    I've been thinking about Joseph Whitworth and his 3 plate method. In the 1830s, Whitworth formalised a method for creating flat (reference) surfaces, using scraping, correct to...
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