Search: Herschel, John in correspondent 
May, Charles in correspondent 
1830-1839::1832 in date 
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Herschel14129

From:
Charles May
To:
Sir John Herschel
Date:
[23 November 1832]
Source of text:
TxU:H/M-0351; Reel 1087
Summary:

J. J. Lister also made set of experimental glasses similar to JH's [see TxU:H/L-0255]. Lister's experiments on color-blind persons. Will forward Lister's glasses to [John] Dalton. CM plans similar experiments with JH's glasses; will forward results to JH at Cape of Good Hope. Wishes to see JH's grinding and polishing machinery.

Contributor:
John Herschel Project

Herschel12848

From:
Sir John Herschel
To:
Charles May
Date:
[1832-11-23 or earli
Source of text:
TxU:H/L-0254 & -0255; Reel 1054
Summary:

Sends set of experimental spectacles for CM to use in testing persons for color-blindness, or 'Dichromic Vision.' Proposes several tests to be conducted with these.

Contributor:
John Herschel Project
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