Trans., Magnetic Investigations for Lieut. Foster,
Isochronous Oscillations in a resisting medium, Observations on a
strange piece of Iceland Spar. On Mar. 7th forwarded Preface and Title
Page for my Mathematical Tracts.
"Some time in this term I began to think of the possibility of
observing the diminution of gravity in a deep mine, and communicated
with Whewell, who was disposed to join in experiments. My first notion
was simply to try the rate of a clock, and the Ecton mine was first
thought of. I made enquiries about the Ecton mine through Mr Smith (of
Edensor), and visited the mine, but in the meantime Whewell had made
enquiries in London and found (principally from Dr Paris) that the
mine of Dolcoath near Camborne in Cornwall would be a better place for
the experiment. Dr Paris wrote to me repeatedly, and ultimately we
resolved on trying it there. In my papers on Mar. 21st are various
investigations about attractions in both mines. On Apr. 3rd I went to
London, principally to arrange about Dolcoath, and during April and
May I was engaged in correspondence with Sir H. Davy (President of
the Royal Society), Mr Herschel, and Dr Young (Secretary of the Board
of Longitude) about the loan of instruments and pendulums.
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