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May, Charles in correspondent 
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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
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
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
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
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
From:
Sir John Herschel
To:
Charles May
Date:
[17 December 1849]
Source of text:
TxU:H/L-0256; Reel 1054
Summary:

Learned of John Gorrie's mechanical ice-making method. Asks CM to send letter to JH recounting conversation of 11 Feb. 1848 in which JH told CM about JH's theory for making ice by compressing air. JH does not want to interfere with Gorrie's claim, but will submit CM's letter to Athenaeum and put on record, for sake of 'scientific history,' that JH was 'certain' that such a principle would work. Condolences for death of CM's partner.

Contributor:
John Herschel Project
From:
Charles May
To:
Sir John Herschel
Date:
[20 December 1849]
Source of text:
TxU:H/M-0352; Reel 1087
Summary:

Sends note with needed facts [related to JH's early discovery of principle for ice-making machine], plus paragraph that JH may wish to insert [in notice to Athenaeum].

Contributor:
John Herschel Project
From:
Charles May
To:
Sir John Herschel
Date:
[23 July 1856]
Source of text:
RS:HS 12.313
Summary:

Recently came across some instructions JH had drawn up for persons who are color blind. Sends a note explaining the work of William Pole on this same subject. Has left the manufactory at Ipswich.

Contributor:
John Herschel Project
From:
Charles May
To:
Sir John Herschel
Date:
[29 November 1859]
Source of text:
RS:HS 12.314
Summary:

Sends a small fragment chipped from the second great bell. Comments on the metal of the bell and the causes of the cracks. Unable to attend the R.S.L. dinner tomorrow.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Charles May
Date:
[5 December 1859]
Source of text:
RS:HS 12.315 & 23.291
Summary:

Thanks for the fragment of poor [Ben?]. Comments on this and the composition of the metal of bells.

Contributor:
John Herschel Project