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1860-1869::1864 in date 
Penrose, Francis Cranmer in author 
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From:
Francis Cranmer Penrose
To:
Sir John Herschel
Date:
1864-7
Source of text:
RS:HS 13.334
Summary:

Is sending JH a paper on standardization of measurement, using decimalization but not the meter.

Contributor:
John Herschel Project