Search: Herschel, John in correspondent 
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letter in document-type 
Airy, George Biddell in addressee 
1840-1849::1849::03 in date 
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Herschel12

From:
Sir John Herschel
To:
George Biddell Airy
Date:
[8 March 1849]
Source of text:
RGO 6.160.78
Summary:

Tells GA about the internal counterpoise system in use in some German telescope mountings, and includes a diagram; JH knows nothing about chilling speculum metal [see GA's 1849-3-7].

Contributor:
John Herschel Project

Herschel138

From:
Sir John Herschel
To:
George Biddell Airy
Date:
[29 March 1849]
Source of text:
RGO 6.694.250
Summary:

Some concerns about GA's intent of attaching magnetic and meteorological observations to the R.A.S.'s Astronomical Observations [see GA's 1849-3-28].

Contributor:
John Herschel Project

Herschel335

From:
Sir John Herschel
To:
George Biddell Airy
Date:
[29 March 1849]
Source of text:
RGO 6.465.26
Summary:

Asks GA if he knows of any rules or pitfalls in calculating time from earlier times [even B.C.] to the present.

Contributor:
John Herschel Project
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