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in 1881. Besides a larger altazimuth that
he erected in 1898, he has widened the field
of operations at Greenwich by the exten-
sive use of photography and the establish-
ment of large equatoreals. From the point
of view of instruments of precision, one of
the most important new features is the as-
trographic equatoreal, set up in 1892 and
used for the Greenwich section of the great
380