Search: John Herschel in collection 
Airy, George Biddell in addressee 
1850-1859::1852::03 in date 
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From:
Sir John Herschel
To:
George Biddell Airy
Date:
[5 March 1852]
Source of text:
RGO 6.341.21
Summary:

Wants to begin using decimal fractional weights of pounds and ounces at the Royal Mint, rather than pennyweights and grains. Would like to extend this method beyond the Mint. Asks for date of heliacal rising of Sirius at Athens in the time of Euripides.

Contributor:
John Herschel Project