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From:
Charles Pritchard
To:
Sir John Herschel
Date:
[27 April 1871]
Source of text:
RS:HS 14.106
Summary:

Tests several possible rules for curving lenses including W. L. Newman's and [Thomas] Cooke's. Tries to put W. L. Newman's rules for lens thickness-to-curvature ratios in a simpler equation.

Contributor:
John Herschel Project