Search: Herschel, John in correspondent 
1840-1849::1842::03::15 in date 
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Herschel3809

From:
Sir John Herschel
To:
Robert Hunt
Date:
[15 March 1842]
Source of text:
George Eastman House, 12.17
Summary:

Believes that the operative rays in JH's thermographic process are neither 'calorific' nor 'thermal'.

Contributor:
John Herschel Project

Herschel4713

From:
George Biddell Airy
To:
Sir John Herschel
Date:
[15 March 1842]
Source of text:
RS:HS 1.102 (C: RGO 6.368.648)
Summary:

Regarding his letter writing. Has a promise of a trip on the Dover Railway.

Contributor:
John Herschel Project
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