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1840-1849::1840::06::19 in date 
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Herschel2472

From:
Edward Sabine
To:
Sir John Herschel
Date:
19 June [1840]
Source of text:
RS:HS 15.326
Summary:

[Charles] Riddell's observations suggest Europe and North America experience magnetic disturbances at similar times, but in opposite directions. Suggests course of action for [Charles] Riddell and Lieutenant Younghusband in North America.

Contributor:
John Herschel Project

Herschel8829

From:
Sir John Herschel
To:
William Henry Fox Talbot
Date:
[19 June 1840]
Source of text:
Science Museum Talbt 1/26
Summary:

Praises various photographs by WT and notes changes in some. Recounts optical experiments, recent and planned, by JH on rock-salt.

Contributor:
John Herschel Project
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