ur way to look at the
church, which had alarmed the people by signs of a crack, and arrived
at Camborne on July 8th. On the 14th we set up the pendulums, and at
once commenced observations, our plan being, to have no intermission
in the pendulum observations, so that as soon as the arc became too
small a fresh series was started. On July 29th we raised the
instruments, and Sheepshanks, who managed much of the upper
operations, both astronomical and of pendulums, mounted the pendulums
together in his observatory. We went on with our calculations, and on
August 8th, on returning from a visit to John Williams at Barncoose,
we heard that there was a 'run' in Dolcoath, that is a sinking of the
whole mass of rock where it had been set free by the mine excavations:
probably only a few inches, but enough to break the rock much and to
stop the pumps. On Aug. 10th the calculations of our observations
shewed that there was something wrong, and on the 13th I perceived an
anomaly in the form of the knife edge of one pendulum, and of its
agate planes, and suggested cautions for repeating the observations.
We determined at once to repeat them: and as the water was rising in
the mine there was no time to be lost. We again sent the instruments
down, and made observations on the 16th, 17th and 18th. On the 19th I
sent the instruments up, for the water was near our station, and
Sedgwick, Whewell, and I went on a geological expedition to the
Lizard. On our return we met Sheepshanks and the others, and found the
results of the last observations unsatisfactory. The results of
comparing the pendulums were discordant, and the knife edge of the
faulty pendulum had very sensibly altered. We now gave up
observations, with the feeling that our time had been totally lost,
mainly through the fault of the maker of the pendulum (T. Jones). On
the 28th we made an expedition to Penzance and other places, and
arrived at Cambridge on the 17th of September.

"In the course of the work at Dolcoath we made various expeditions as
opportunity offered. Thus we walked to Carn Brea and witnessed the
wrestling, the common game of the country. On another occasion
Sedgwick, Whewell, and I had a capital geological expedition to
Trewavas Head to examine granite veins. We visited at Pendarves and
Trevince, and made the expedition to the Lizard already referred to,
and saw many of the sights in the neighbourhood. After visiting
Penzance on the conclusion of our work we