Search: Herschel, John in correspondent 
De Morgan, Augustus in correspondent 
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1840-1849::1840::06 in date 
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Herschel6881

From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[5 June 1840]
Source of text:
RS:HS 6.184
Summary:

Possible to purchase 12 postage covers for 11d in the Strand. Points out an apparent error in one of JH's books on sound. How does an open pipe vibrate? Regarding the private character of J. L. Lagrange.

Contributor:
John Herschel Project

Herschel6882

From:
Sir John Herschel
To:
Augustus De Morgan
Date:
[26 June 1840]
Source of text:
RS:HS 22.55
Summary:

Thanks AD for a correction in one of JH's writings; tries to explain the partial echo that occurs when blowing across the end of an open pipe.

Contributor:
John Herschel Project
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