Word: gregorian
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Dates: during 1890-1899
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...eight large instruments and several smaller telescopes at the Observatory. The largest telescope is 15 inches in diameter and has a power of magnifying 5000 times. This instrument, the gift of the Hon. David Sears, was the nucleus upon which the Observatory was first started in 1843. The four Gregorian Reflectors of different diameters are used for photographic purposes only. Nearly all the modern instruments and appliances for surveying the heavens are at the Observatory A large part of the time signals of New England is furnished by the time service of the Observatory...