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Warner, Thomas in correspondent 
Herschel, John in author 
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From:
Sir John Herschel
To:
Thomas Warner
Date:
[7 July 1869]
Source of text:
'Preface to Improved Edition' of Thomas Warner, How To Keep the Clock Right (187
Summary:

Received TW's book and approves simplicity and economy of its method of keeping time by using small fixed telescope to reduce star observations. Disapproves of using 'Dominical Letters.' Suggests using Julian dates.

Contributor:
John Herschel Project
Document type
Transcription available