Page history
21 May 2011
12 May 2011
8 May 2011
26 April 2011
11 April 2011
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6 March 2011
17 January 2011
Sixty545
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9 January 2011
8 January 2011
4 January 2011
31 December 2010
27 December 2010
24 December 2010
17 December 2010
10 December 2010
Don
Aspheric means, not sperical in cross-section. It ought to be aspherical, but nobody uses that form.
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Brted
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6 December 2010
Don
A few additions - which might be better elsewhere.
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