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

Herschel11948

From:
Charles May
To:
Sir John Herschel
Date:
[7 March 1833]
Source of text:
RS:HS 12.310
Summary:

Has received the glasses from Dr. John Dalton with very minute answers. Dalton gave a paper on this subject in 1794 to the Manchester Society. Will bring them to London tomorrow. Dr. Simms is in a critical condition.

Contributor:
John Herschel Project

Herschel11949

From:
Charles May
To:
Sir John Herschel
Date:
[16 April 1833]
Source of text:
RS:HS 12.311
Summary:

Sends some specimens of aloes and calocynth with some remarks on them. Also sends some sugar made by evaporating the cane juice under diminished pressure. Inquired from J. Lister regarding the elasticity of hardened steel wire.

Contributor:
John Herschel Project

Herschel11950

From:
Charles May
To:
Sir John Herschel
Date:
[25 October 1833]
Source of text:
RS:HS 12.312
Summary:

Hopes this letter will reach him before his departure for the Cape. Wishes someone in the proper climate would make a study of the best kind of Aloe for medicinal purposes. Encloses letter and plates on this subject and would be pleased if JH would show them to Thomas Maclear. Has not been able to obtain any further information from dichromic persons.

Contributor:
John Herschel Project
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