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1840-1849::1847 in date 
Herschel, John in addressee 
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Richardson, John in correspondent 
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From:
Sir John Richardson
To:
Sir John Herschel
Date:
[28 December 1847]
Source of text:
RS:HS 14.486
Summary:

Asks: for name of instrument maker JH recommends for construction of actinometers; which hydrogrameters should be taken to Mackenzie's River; and whether JH has any experiments he would like done in America.

Contributor:
John Herschel Project