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plied for bringing the micrometer wire ac-
tually in line with a division on the circle–a
plan which is still always adopted.
Pond succeeded Maskelyne in 1811, and
was the first to use this instrument. From
now onwards the places of stars were re-
ferred to the pole, not to the zenith; the
zero being obtained from measures on cir-
cumpolar stars. Standard stars were used
369
