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Herschel10649

From:
Frederick Howlett
To:
Sir John Herschel
Date:
[28 April 1870]
Source of text:
RS:HS 10.23
Summary:

Has no idea whether the sunspots appeared suddenly or gradually. The Kew people may be able to help in this matter. Comments on some more sunspots.

Contributor:
John Herschel Project

Herschel9350

From:
Georg Adolph Erman
To:
Sir John Herschel
Date:
[28 April 1870]
Source of text:
RS:HS 7.104
Summary:

Sends two of his publications, one on terrestrial magnetism at Berlin. Comments on the results, and wonders if JH would enlist the help of the B.A.A.S. to finance further studies by H. J. R. Petersen.

Contributor:
John Herschel Project

Herschel1607

From:
Sir John Herschel
To:
Edward Sabine
Date:
[28 April 1870]
Source of text:
Cambridge University Library 7656/H727 (C: RS:HS 24.307)
Summary:

Comments on the effect of great temperature variations on the speculum of a telescope.

Contributor:
John Herschel Project

Herschel3448

From:
Sir John Herschel
To:
Edward Sabine
Date:
[28 April 1870]
Source of text:
RS MC.9.63 (C: RS:HS 24.308)
Summary:

ES has been forwarded letter explaining why 'great telescope' at Melbourne will not work and suggesting construction corrections, on which JH, who believes such 'a priori condemnation' unjustified, comments herein.

Contributor:
John Herschel Project
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