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