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Milky Way portion, a serious labour, when
they saw Gill’s Comet photograph and con-
ceived the idea of doing the rest of their
work by photography. Gill had previously
written to Admiral Mouchez, of the Paris
Observatory, and explained to him his project
for charting the heavens photographically,
by combining the work of many observa-
tories. This led Admiral Mouchez to sup-
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