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1860-1869::1860::06 in date 
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Herschel721

From:
Sir John Herschel
To:
Alexander Stewart Herschel
Date:
6 [June] 1860
Source of text:
JHS 1.114
Summary:

Mostly taken up with JH advising AH about changing his course of studies at Cambridge, together with some family news from home.

Contributor:
John Herschel Project

Herschel8675

From:
Sir John Herschel
To:
Thomas Stevenson
Date:
[15 June 1860]
Source of text:
NatLibScot MS.785, f.23
Summary:

Thanks TS for TS's publication on lighthouse illumination; adds some of JH's own ideas on the subject.

Contributor:
John Herschel Project

Herschel942

From:
Sir John Herschel
To:
Unidentified
Date:
[1860-6-25 or later]
Source of text:
JHS 6.64
Summary:

Comments on the behavior of Sirius with its companion, and on the likelihood of the existence of the inter-Mercurial planet.

Contributor:
John Herschel Project

Herschel8931

From:
Sir John Herschel
To:
Photographic News
Date:
[30 June 1860]
Source of text:
Photographic News, 4 (1860), 118
Summary:

[Writing under the pseudonym 'Redde Suum Cuique'], JH notes that a recently published process for recovering silver from old plate was in fact anticipated by James Keir in a 1790 R.S.P.T. paper. Attacks a recent misuse of the word 'actinometer.'

Contributor:
John Herschel Project
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