Search: Herschel, John in correspondent 
Herschel, John in author 
1840-1849::1842::04 in date 
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Herschel11911

From:
Sir John Herschel
To:
Johann Heinrich Mädler
Date:
[1842-4]
Source of text:
RS:HS 12.273 & 22.144
Summary:

Is gratified that JM is taking an interest in double stars. Comments on some of the observations and time of their orbits.

Contributor:
John Herschel Project

Herschel4405

From:
Sir John Herschel
To:
William Henry Smyth
Date:
[3 April 1842]
Source of text:
RS:HS 22.116
Summary:

Plans to calculate Gamma Virginis orbit. Received WS paper on astronomical observations. Suggests WS look for a house in Kent after learning plans to move near London.

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

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

Herschel8146

From:
Sir John Herschel
To:
[F. M. Eardley]-Wilmot
Date:
[19 April 1842]
Source of text:
RS:HS 18.413b
Summary:

[JH's outline of letter] Compares Wilmot's actinometer observations with JH's. Acknowledges receipt of St. Helena specimens.

Contributor:
John Herschel Project

Herschel12806

From:
Sir John Herschel
To:
Joseph Henry Kay
Date:
[19 April 1842]
Source of text:
TxU:H/L-0211; Reel 1054
Summary:

Impressed by accuracy of actinometer measurements made by JK, Joseph Dayman, and P. A. Scott from Feb. to Sept. 1841 at JK's observatory at Rossbank [Tasmania]. Suggests methods to improve readings and simplify reductions.

Contributor:
John Herschel Project

Herschel8837

From:
Sir John Herschel
To:
William Henry Fox Talbot
Date:
[21 April 1842]
Source of text:
Science Museum Talbt 1/34
Summary:

Thanks for calotypes involving persons engaged in actions. Gives encouragement to WT's planned photographic tour in Germany. JH has been experimenting regarding color photography.

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

Herschel2959

From:
Sir John Herschel
To:
Adolphe Quetelet
Date:
[29 April 1842]
Source of text:
Académie belgique: #17
Summary:

Stresses importance of development and phases of periodic phenomena on earth's surface. Magnitudes of stars are the only observations JH is doing. Asks for help in planning trip on continent for three of his daughters and their governess.

Contributor:
John Herschel Project
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