From:
William Whewell
To:
Sir John Herschel
Date:
[27 May 1858]
Source of text:
TxU:H/M-5075
Summary:
Believes that it is not worth the cost to sustain many permanent magnetic observatories, but a few for a limited time would make sense. Unclear which observatories these should be.
Contributor:
John Herschel Project