Search: Herschel, John in author 
Herschel, John in correspondent 
1840-1849::1842 in date 
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Showing 61–80 of 136 items

Herschel3243

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

Herschel3264

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

Herschel3282

From:
Sir John Herschel
To:
Roderick Impey Murchison
Date:
[13 February 1842]
Source of text:
EUL:Gen523/4/28
Summary:

On RM's stepping down as president of Geological Society. Where exactly abroad will RM pursue enquiries?

Contributor:
John Herschel Project

Herschel3316

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

Herschel3392

From:
Sir John Herschel
To:
Edward Sabine
Date:
[27 January 1842]
Source of text:
RS MC.3.204
Summary:

Clarifies role and methods of R.S.L. Council and scientific committees, suggesting that members of Physical Committee need to be better informed about its activities.

Contributor:
John Herschel Project

Herschel3490

From:
Sir John Herschel
To:
R.S.L. Physical Committee
Date:
[17 February 1842]
Source of text:
RS MM 11.171 & 173
Summary:

Discusses how exceptional observations of meteorological and magnetical phenomena should be recorded and what significance should be attached to them. Cannot attend next meeting of committee.

Contributor:
John Herschel Project

Herschel3522

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

Herschel3603

From:
Sir John Herschel
To:
[R.S.L. Council?]
Date:
[1 June 1842]
Source of text:
RS MC.3.218
Summary:

Discusses JH's spectrometer and possibility of using surplus from R.S.L. Donation Fund for its construction and enquiry with it into nature of light and heat.

Contributor:
John Herschel Project

Herschel3770

From:
Sir John Herschel
To:
Caroline Lucretia Herschel
Date:
[10 February 1842]
Source of text:
TxU:H/L-0587.2.b; Reel 1058
Summary:

Is confident that by summer his sweeps will all be reduced and arranged in three catalogs for JH's Cape Results.

Contributor:
John Herschel Project

Herschel3771

From:
Sir John Herschel
To:
Caroline Lucretia Herschel
Date:
[11 July 1842]
Source of text:
TxU:H/L-0587.10; Reel 1058
Summary:

Met Friedrich Bessel at the Manchester B.A.A.S. meeting; invited him to Collingwood, where he expects Bessel in a few days. Enclosed with the letter a specimen of a new photographic process called 'Chrysotype.' Marvels at traveling from Hawkhurst to Manchester round trip (420 miles) in under 23 hours!

Contributor:
John Herschel Project

Herschel3772

From:
Sir John Herschel
To:
Caroline Lucretia Herschel
Date:
[4 September] 1842
Source of text:
TxU:H/L-0587.13; Reel 1058
Summary:

Reports the erection of an obelisk at Feldhausen to commemorate the site of JH's 20-ft. reflector. Back at Cape Town, Thomas Maclear is measuring N. L. Lacaille's Arc of the Meridian. JH received the Prussian Order of Merit.

Contributor:
John Herschel Project

Herschel3773

From:
Sir John Herschel
To:
Caroline Lucretia Herschel
Date:
[12 October 1842]
Source of text:
TxU:H/L-0587.15.a; Reel 1058
Summary:

JH finished his catalog of stars for his Cape Results; hopes to be finished with his nebulae and double star catalogs soon.

Contributor:
John Herschel Project

Herschel3806

From:
Sir John Herschel
To:
Robert Hunt
Date:
1842-9
Source of text:
George Eastman House, 8.17 (C: RS:HS 22.133)
Summary:

Thanks for RH's paper on mineralogy. JH has explored use of mercury together with iron in photography.

Contributor:
John Herschel Project

Herschel3808

From:
Sir John Herschel
To:
Robert Hunt
Date:
1842-5
Source of text:
George Eastman House, 10.17 (C: RS:HS 22.117)
Summary:

Some information about Charles Piazzi Smyth. JH needs information about some of RH's photographic paper, which JH has tried but without success.

Contributor:
John Herschel Project

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

Herschel383

From:
Sir John Herschel
To:
George Biddell Airy
Date:
[10 April 1842]
Source of text:
RGO 6.463.300
Summary:

Sends GA a spectrum photograph, and explains how JH obtained it.

Contributor:
John Herschel Project

Herschel384

From:
Sir John Herschel
To:
George Biddell Airy
Date:
[24 April 1842]
Source of text:
RGO 6.463.303
Summary:

Sends GA two more spectrum photographs [see JH's 1842-4-10], and believes that these may lead the way to color photography.

Contributor:
John Herschel Project

Herschel3848

From:
Sir John Herschel
To:
Caroline Lucretia Herschel
Date:
[8 December 1842]
Source of text:
unknown
Summary:

Finished the reductions of all of the nebulae and double stars recorded at Cape Town; JH soon hopes to prepare for the publication of his Cape Results.

Contributor:
John Herschel Project

Herschel3948

From:
Sir John Herschel
To:
Robert Hunt
Date:
[2 December 1842]
Source of text:
George Eastman House, 11.17 (C: RS:HS 22.143)
Summary:

Sends RH a packet of photographs with a description of each type.

Contributor:
John Herschel Project

Herschel3994

From:
Sir John Herschel
To:
Caroline Lucretia Herschel
Date:
9] March [1842
Source of text:
TxU:H/L-0587.4; Reel 1058
Summary:

Remarks that he is 50 years old, and that he and CH have 'seen something of that odd and most changeable compound called Human Nature.'

Contributor:
John Herschel Project
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