Tresca
requested that, if possible, some of the original thermometers made by
Mr Sheepshanks might be appropriated to the use of the International
Commission. I have therefore transferred to M. Tresca the three
thermometers A.6, S.1, S.2, with the documentary information relating
to them, which was found in Mr Sheepshanks's papers; retaining six
thermometers of the same class in the Royal Observatory.--The Sidereal
Standard Clock continues to give great satisfaction. I am considering
(with the aid of Mr Buckney, of the firm of E. Dent and Co.) an
arrangement for barometric correction, founded on the principle of
action on the pendulum by means of a magnet which can be raised or
lowered by the agency of a large barometer.--The Altazimuth has
received some important alterations. An examination of the results of
observations had made me dissatisfied with the bearings of the
horizontal pivots in their Y's. Mr Simms, at my request, changed the
bearings in Y's for bearing in segments of circles, a construction
which has worked admirably well in the pivots of the Transit Circle."
(And in various other respects the instrument appears to have received
a thorough overhauling. Ed.)--"With the consent of the Royal Society
and of the Kew Committee, the Kew Heliograph has been planted in the
new dome looking over the South Ground.
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