Search: Herschel, John in correspondent 
Forbes, James David in correspondent 
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John Herschel Project in contributor 
1840-1849 in date 
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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
From:
James David Forbes
To:
Sir John Herschel
Date:
[9 March 1840]
Source of text:
St. Andrews LB III 71, 72 (C: RS:HS 7.295)
Summary:

Would like to know the degree of sensibility to heat of JH's paper. The paper of W. H. F. Talbot is useless for his purpose as only violet heat affects it. Did JH use a flint glass prism for his spectrum experiments? Has he ever used photography to show the impression of polarization and diffraction?

Contributor:
John Herschel Project
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
From:
James David Forbes
To:
Sir John Herschel
Date:
[4 June 1840]
Source of text:
RS MM.16.137
Summary:

Explains results obtained by R.S.L. subcommittee considering state of meteorological journal published in R.S.P.T. Wonders about feasibility of establishing 'simple but accurate meteorological register' under public authority.

Contributor:
John Herschel Project
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
From:
James David Forbes
To:
Sir John Herschel
Date:
[11 June 1840]
Source of text:
RS MM.16.138 (C inc: TxU:H/M-0145.3; Reel 1087)
Summary:

Describes difficulties in attempting to produce good meteorological register and establish national meteorological observatory.

Contributor:
John Herschel Project
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
From:
James David Forbes
To:
Sir John Herschel
Date:
[17 August 1840]
Source of text:
St. Andrews LB III, 120-2 (C: RS:HS 7.296)
Summary:

Thanks for JH's letters and the paper on photography with special reference to the effects of heat. Was present at the R.S.L. during consideration of a national observatory. Would like JH's opinion. Is working on a supplementary report on meteorology.

Contributor:
John Herschel Project
From:
James David Forbes
To:
Sir John Herschel
Date:
[26 March 1841]
Source of text:
RS:HS 7.297
Summary:

Sending a notice about the polarization of the sky. Also some practical papers he set at Durham. Has the obelisk ready for shipment to the Cape. Has asked Richard Taylor to send him a copy of his report on Meteorology.

Contributor:
John Herschel Project
From:
James David Forbes
To:
Sir John Herschel
Date:
[30 December 1841]
Source of text:
St. Andrews LB III, 292- (C: RS:HS 7.298)
Summary:

About various testimonials, from JH and others, for JF's application for a government pension.

Contributor:
John Herschel Project
From:
James David Forbes
To:
Sir John Herschel
Date:
[12 January 1842]
Source of text:
St. Andrews LB III, 318-19 (C: RS:HS 7.299)
Summary:

Is grateful for JH's letter and commendation regarding application for a government pension; will endeavor to carry out his recommendations.

Contributor:
John Herschel Project
From:
James David Forbes
To:
Sir John Herschel
Date:
[6 April 1842]
Source of text:
RS:HS 7.301
Summary:

Would like to know the composition of the fluid in JH's actinometers.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
James David Forbes
Date:
1842-4-9[?]
Source of text:
St. Andrews 21? (C: RS:HS 22.115)
Summary:

Instructions for preparing liquid for the actinometer. Describes 'very strange' experiments on the spectrum as well as an 'unusual' cloud formation.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
James David Forbes
Date:
[1842-5]
Source of text:
St. Andrews 43?
Summary:

Proposes meeting times in town. Suggests that JF observe the upcoming total eclipse astronomically. Agrees with JF's seemingly 'cold &c' circular on scientific partnerships, while regretting that it needed to be written.

Contributor:
John Herschel Project
From:
James David Forbes
To:
Sir John Herschel
Date:
[12 May 1842]
Source of text:
RS:HS 7.302
Summary:

Would like to see him for a few minutes to discuss a paper he is preparing for the R.S.L. on actinometer observations.

Contributor:
John Herschel Project
From:
James David Forbes
To:
Sir John Herschel
Date:
[14 May 1842]
Source of text:
RS:HS 7.303
Summary:

No meeting of the R.S.L. on the 19th but could arrange to see him before dinner. Hopes to spend the summer amongst the glaciers.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
James David Forbes
Date:
16?] May [1842
Source of text:
St. Andrews 49
Summary:

Sets up approximate meeting time, depending on his family's timely departure to Antwerp, with JF at the R.S.L. apartments.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
James David Forbes
Date:
[2 June 1842]
Source of text:
St. Andrews 55 (C: RS:HS 22.122)
Summary:

Compares actinometric measurements of radiation. Explains interest in total eclipse relative to actinometry. Discusses the possibility of making actinometric measurements by photographic means.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
James David Forbes
Date:
[15 November 1842]
Source of text:
RS:HS 25.6.15 (C: TxU:H/L-0159; Reel 1054)
Summary:

Received JF's paper on 'thermographic process.' Believes that thermic rays were responsible for experimental results of JF, J. W. Draper, and Ludwig Moser. JH's theory of and experiments with thermic rays, which are different from 'calorific' and visible rays, in solar spectrum.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
James David Forbes
Date:
[19 January 1843]
Source of text:
RS:HS 7.304 & 22.146
Summary:

Protesting about the refusal of the Royal Society of Edinburgh to publish Thomas Brisbane's magnetic observations; hopes it will be reconsidered. Thinks JF's theory on glaciers has good points, but comments on some of its shortcomings.

Contributor:
John Herschel Project