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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

Herschel8127

From:
Charles H. Weston
To:
Sir John Herschel
Date:
[26 December 1870]
Source of text:
RS:HS 18.393
Summary:

Moon not uniformly dark during last eclipse of sun. In 1858, Mr. Stuart saw same phenomenon, but JH, W. R. Dawes, and [James] Breen reported no such partial illumination. Suggests that this observation was due to refrangibility in medium, not to actual illumination of moon.

Contributor:
John Herschel Project

Herschel9354

From:
Georg Adolph Erman
To:
Sir John Herschel
Date:
[20 December 1870]
Source of text:
RS:HS 7.106
Summary:

Sends an article from the Astronomische Nachrichten acknowledging the assistance of the B.A.A.S. to two Prussian scientists.

Contributor:
John Herschel Project

JHC1538

From:
Sir Joseph Dalton Hooker
To:
Henry Bolus
Date:
7 December 1870
Source of text:
JDH/2/3/3 f.16, The Royal Botanic Gardens, Kew
Summary:

No summary available.

Contributor:
Hooker Project
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