Page 631 - 89 history of astronomy_opt

port the brothers Henry in their scheme.[21]
Gill, having got his own photographic work
underway, suggested an international astro-
graphic chart, the materials for different zones
to be supplied by observatories of all na-
tions, each equipped with similar photographic
telescopes. At a conference in Paris, 1887,
this was decided on, the stars on the charts
going down to the fourteenth magnitude,
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