From:
Sir John Herschel
To:
[Edward Sabine?]
Date:
[1864-6]
Source of text:
TxU:H/M-0579.2; Reel 1093
Summary:
Pendulum experiments are already approved at principal stations in Russian trigonometrical survey. Recent communication from J. H. Pratt to R.S.L. about pendulum observations.
Contributor:
John Herschel Project