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Stewart, John in correspondent 
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From:
Sir John Herschel
To:
John Stewart
Date:
[14 July 1839]
Source of text:
APS B.H435p.10
Summary:

Is willing to be a witness to some battery experiments by J. P. Gassiot, but JH is busy, mostly with house hunting, and so may not be available.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
John Stewart
Date:
1843-2
Source of text:
RS:HS 19.102
Summary:

Agrees to provide Josiah Quincy with extracts from letters by James Grahame. Highlights of Grahame's life.

Contributor:
John Herschel Project
From:
John Stewart
To:
Sir John Herschel
Date:
[1852]
Source of text:
Athenaeum, #1311 (Dec. 11, 1852), 1363-4
Summary:

Explains in detail his photographic method for producing landscapes on paper.

Contributor:
John Herschel Project
From:
John Stewart
To:
Sir John Herschel
Date:
[11 June 1853]
Source of text:
Athenaeum, #1341 (July 9, 1853), 83 & Journal of the Photographic Society, 1:8
Summary:

Describes a method developed by [J. J.] Heilmann of 'taking from glass negatives positive impressions of different dimensions.' Praises JH's suggestion that public records be preserved on microscopic negatives.

Contributor:
John Herschel Project