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R.S.L. Physical Committee, Secretary of in correspondent 
1840-1849::1842::01::01 in date 
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From:
Sir John Herschel
To:
Secretary of R.S.L. Physical Committee
Date:
[1842 or later]
Source of text:
TxU:H/L-0722; Reel 1089
Summary:

Offers to provide committee with plans for and to supervise construction of new instrument, devised by JH, for study of solar spectrum.

Contributor:
John Herschel Project