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Philosophical Magazine in correspondent 
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letter in document-type 
1840-1849 in date 
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From:
Sir John Herschel
To:
Philosophical Magazine
Date:
[15 February 1840]
Source of text:
P.M., 3rd. ser., 16 (1840), 194-5
Summary:

Reports on a simple mode of obtaining from a common Argand oil lamp a greatly increased quantity of light.

Contributor:
John Herschel Project