Search: Herschel, John in author 
Dallmeyer, John Henry in correspondent 
Herschel, John in correspondent 
1860-1869 in date 
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Herschel6684

From:
Sir John Herschel
To:
John Henry Dallmeyer
Date:
[30 September 1866]
Source of text:
RS:HS 24.167
Summary:

Provides a physical explanation for a white patch in the center of JD's photograph.

Contributor:
John Herschel Project

Herschel6686

From:
Sir John Herschel
To:
John Henry Dallmeyer
Date:
[16 February 1867]
Source of text:
RS:HS 6.4 & 24.188
Summary:

Is he acquainted with his ordinary reading glass? Gives details. Always carries a small one around with him for reading small print; thinks there would be a good market for them.

Contributor:
John Herschel Project

Herschel6688

From:
Sir John Herschel
To:
John Henry Dallmeyer
Date:
[19 February 1867]
Source of text:
RS:HS 6.6 & 24.189
Summary:

Outlining suitability of various types of glass for optical work. Gives details of theories of his reading lenses and calls attention to one of his own papers in the R.S.P.T. for 1821.

Contributor:
John Herschel Project
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