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Draper, John William in correspondent 
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From:
John William Draper
To:
Sir John Herschel
Date:
[28 July 1840]
Source of text:
RS:HS 6.501
Summary:

Sending a heliographic portrait taken from life. Comments on his methods.

Contributor:
John Herschel Project
From:
John William Draper
To:
Sir John Herschel
Date:
[26 September 1842]
Source of text:
RS:HS 6.502
Summary:

Sending a Daguerreotype impression of the spectrum. Comments on this. Is publishing a work on the chemical rays.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
John William Draper
Date:
[5 December 1842]
Source of text:
RS:HS 25.6.16
Summary:

Comments on JD's work in photography; JH goes on to talk about JH's ideas of 'chemical' rays of light.

Contributor:
John Herschel Project
From:
John William Draper
To:
Sir John Herschel
Date:
[12 November 1844]
Source of text:
RS:HS 19.270
Summary:

Sends papers and new book on 'Chemical influence of Light' by JD. Received JH's papers. Apologizes for failing to give JH discovery credit. Notes on light interference.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
John William Draper
Date:
[15 March 1845]
Source of text:
RS:HS 22.226
Summary:

Comments on writings of JD on the chemistry of plants [letter completed 1845-5-7].

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
John William Draper
Date:
[7 May 1845]
Source of text:
RS:HS 19.117
Summary:

Critiques JD's paper on plant chemistry, contrasting 'luminous, colorific, calorific, & chemical or photographic' rays. Physics of light. [Letter continues two months later.] JH is done with photography. Has no desire to claim priorities in that field. Entrusts future to JD and others.

Contributor:
John Herschel Project