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DCP-LETT-328

From:
Emma Wedgwood; Emma Darwin
To:
Frances Emma Elizabeth (Fanny) Mackintosh; Frances Emma Elizabeth (Fanny) Wedgwood
Date:
[17 Dec 1836]
Source of text:
V&A / Wedgwood Collection (MS WM 233)
Summary:

The Darwin family are anxious for FEEW’s and Hensleigh’s opinions of CD’s journal. EW is convinced that Henry Holland is wrong if he thinks it not worth publishing.

Contributor:
Darwin Correspondence Project

Herschel11736

From:
Thomas Maclear
To:
Sir John Herschel
Date:
[18 December 1836]
Source of text:
RS:HS 12.98
Summary:

Definition at the Observatory last night was abominable; therefore no comparisons can be made between the stations. Much obliged for the details of the actinometer. Will call on JH later.

Contributor:
John Herschel Project

Herschel2206

From:
Sir Edward Ryan
To:
Sir John Herschel
Date:
[17 December 1836]
Source of text:
RS:HS 14.450
Summary:

Introduces [Charles?] Cameron. Received angry and excited letter from Charles Babbage. Discusses barometers. Heard Herschels may be travelling to Rio de Janeiro.

Contributor:
John Herschel Project

Herschel3937

From:
Sir John Herschel
To:
Thomas Maclear
Date:
[17 December 1836]
Source of text:
unknown
Summary:

Setting a unit of measurement for solar radiation (the 'actine'); proposes to 'take for a unit of solar heat that which if all employed in heating a cubic inch of water exposing a horizontal surface of one square inch, to a vertical Sun during one minute would produce a dilation of one thousandth part of its volume.'

Contributor:
John Herschel Project
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