Search: Herschel, John in correspondent 
No in transcription-available 
Forbes, James David in addressee 
1840-1849::1840 in date 
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Herschel3521

From:
Sir John Herschel
To:
James David Forbes
Date:
[3 March 1840]
Source of text:
St. Andrews 12 (C: RS:HS 25.6.1 & TxU:H/L-0157; Reel 1054)
Summary:

Outlines theory behind and method for preparing thermographic paper, which allows observers to determine 'what share each ray of the spectrum bears in producing the observed total effects.'

Contributor:
John Herschel Project

Herschel3595

From:
Sir John Herschel
To:
James David Forbes
Date:
[13 March 1840]
Source of text:
St. Andrews 13 (C: RS:HS 22.44)
Summary:

On the preparation of paper to exhibit a thermal spectrum.

Contributor:
John Herschel Project

RS-MM-001100

From:
John Frederick William Herschel
To:
James David Forbes
Date:
4 June 1840
Source of text:
MM/16/137, Royal Society
Summary:

No summary available.

Contributor:
Royal Society

Herschel3131

From:
Sir John Herschel
To:
James David Forbes
Date:
[10 June 1840]
Source of text:
St. Andrews 34 (Adraft: TxU:H/L-0158 & -0145.2; Reel 1054 & C: RS:HS 22.44)
Summary:

R.S.L. will deviate from its intellectual purpose whenever it meddles in practical observations. Proper role for R.S.L. is to suggest goals and methods and to reward discoveries. Recommends discontinuing meteorological observations at Somerset House; other stations now provide better data. If R.S.L. insists on establishing a meteorological register, JH suggests one like that of J. F. Daniell.

Contributor:
John Herschel Project

Herschel3313

From:
Sir John Herschel
To:
James David Forbes
Date:
[10 August 1840]
Source of text:
St. Andrews 42 (C: RS:HS 22.62)
Summary:

Explains efforts at using a makeshift apparatus for 'fixing the spectrum.' Discusses current confusion and ultimate hope surrounding JF's meteorological recommendations. In a postscript, notes observations of meteors in Persei.

Contributor:
John Herschel Project
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