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Herschel, John in correspondent 
Dallmeyer, John Henry in correspondent 
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Herschel6690

From:
John Henry Dallmeyer
To:
Sir John Herschel
Date:
[23 December 1870]
Source of text:
RS:HS 6.8
Summary:

Has made a trial of JH's lens but it was too large to be satisfactory. Regarding the 'graphoscope,' a new toy. Has been concerned with the manufacture of an improved form of opera glass. Present forms have many imperfections. Gives details of his own theories and sends one for JH's notice.

Contributor:
John Herschel Project

Herschel6691

From:
Sir John Herschel
To:
John Henry Dallmeyer
Date:
[25 December 1870]
Source of text:
RS:HS 24.340
Summary:

Thanks and a detailed description of the functioning of a pair of binoculars sent by JD to JH.

Contributor:
John Herschel Project

Herschel6692

From:
John Henry Dallmeyer
To:
Sir John Herschel
Date:
[27 December 1870]
Source of text:
RS:HS 6.9
Summary:

Thanks for his letter. Is glad the binoculars give a satisfactory performance, but regrets the width between the tubes does not suit JH's eyes. Will alter this and send a new pair later.

Contributor:
John Herschel Project
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