From:
Sir John Herschel
To:
Henry Kater
Date:
[21 March 1826]
Source of text:
RS:HS 20.231
Summary:
Asks for the use of an invariable pendulum and a clock from the Board of Longitude so that G. B. Airy and William Whewell can carry out experiments to measure the change in gravity and the mean density of the earth, in a Yorkshire coal mine.
Contributor:
John Herschel Project