A similar determination has also been made
in the case of Jupiter, with equally satisfactory results.--An
Electrometer on Sir William Thomson's plan, for continuous
photographic registration of atmospheric electricity has been received
from Mr White of Glasgow. It was mounted in December.--The computation
of the photographic records of the barometer from 1854 to 1873 has so
far advanced that we can assert positively that there is no trace of
lunar tide in the atmosphere; but that there is a strongly marked
semi-diurnal solar tide, accompanied with a smaller diurnal tide. We
are at present engaged in comparing the barometric measures with the
directions of the wind.--Regarding the distribution of the printed
observations: There is no extensive wish for separate magnetic
observations, but general magnetic results are in great demand,
especially for mining operations, and to meet this a map of magnetic
declination is furnished in the newspaper called the 'Colliery
Guardian.'--As regards the operations for the Transit of Venus: The
computing staff has by degrees been reduced to two junior computers
within the Observatory; and one or two computers external to the
Observatory, who are employed on large groups of systematic
calculations.
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