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