Word: geiss
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Dates: during 1902-1902
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...valuable new photographic instrument has lately been purchased by the Observatory. It is known as a Ross-Geiss lens and will be used for photographing and charting the sky. It was constructed especially for this purpose, and will cover a larger field than any other instrument at the Observatory. Owing to its wide range it will now be possible to chart the sky every night, whereas previously this has been possible only three times a month, and consequently many phenomena have been unobserved. The instrument has already been put up and is now ready...