History and Description of Mr. Tebbutt's Observatory: Windsor, New South Wales (Classic Reprint)

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Excerpt from History and Description of Mr. Tebbutt's Observatory: Windsor, New South Wales The reduction for a complete observation of an equatorial star at the upper culmination, clamp east, is therefore 0 070s. The threads are illuminated by a lamp standing on a shelf near one of the pivots. The light falling on a lens in one of the pivots passes down the hollow conical axis of the transit and is brought to a focus on a small re ector in the middle of the central cube, thence it proceeds down the tube to the transit ...

History and Description of Mr. Tebbutt's Observatory: Windsor, New South Wales (Classic Reprint) 2016, Forgotten Books

ISBN-13: 9781334031885

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