Search: Airy, George Biddell in correspondent 
Herschel, John in correspondent 
1840-1849::1845::04::04 in date 
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From:
George Biddell Airy
To:
Sir John Herschel
Date:
[4 April 1845]
Source of text:
RGO 6.675.391
Summary:

Last letter to JH was private [see GA's 1845-4-1].

Contributor:
John Herschel Project
From:
George Biddell Airy
To:
Sir John Herschel
Date:
[4 April 1845]
Source of text:
RS:HS 1.147 (C: RGO 6.463.324)
Summary:

Wants information on dispersion/separation of light in plate or crown glass.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
George Biddell Airy
Date:
1845-4-4 or later
Source of text:
RGO 6.463.325
Summary:

Provides the best values available for dispersion and separation, which will allow GA to calculate what he needs [see GA's 1845-4-4].

Contributor:
John Herschel Project