A New Dome for Equatorials

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

WITH reference to the note in NATURE of January 12 (p. 257), on ``A New Dome for Equatorials,'' allow me to point out that a rotary dome without a shutter was, as far as I know, first constructed for the observatory in Strassburg. The late Prof. Winnecke, at the meeting of astronomers in Berlin on September 5, 1879, referred to it as follows (Vierteljahrsschrift der Astronomischen Gesellschaft, 14 Jahrgang, p. 334): ``In consequence of the construction of the altazimuth, in which the telescope was placed at the end of the axis, the dome of the north tower had to have an unusually large aperture. This was easily accomplished by employing two separate halves of a hemisphere, which could be rolled back on wheels situated above the circular rail, by which means a complete aperture of 2½ metres could be obtained. The mechanism for the movable parts works easily and surely.''

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