Search: Herschel, John in correspondent 
Jopling, Joseph in correspondent 
1860-1869::1861 in date 
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Herschel11089

From:
Joseph Jopling
To:
Sir John Herschel
Date:
[24 January 1861]
Source of text:
RS:HS 10.425
Summary:

Encloses another design for permanent lines on the faces of a pyramid to observe and record astronomical facts; comments on his methods.

Contributor:
John Herschel Project

Herschel11090

From:
Joseph Jopling
To:
Sir John Herschel
Date:
[13 February 1861]
Source of text:
RS:HS 10.426
Summary:

Is obliged for his note and statement on the necessity of pegs at the ends of the lines of the Great Pyramid; comments on this. Has seen Augustus De Morgan and explained his theories. Urges the need for a permanent practical geometrical gallery.

Contributor:
John Herschel Project
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