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 Right ascension. The exact perpendicularity of these threads to the declination threads, as well as the mutual parallelism of these latter threads themselves, has been carefully verified. The micrometer is furnished with four eyepieces having powers ranging from 90 to 325 diameters. The illuminating lamp is suspended in a crutch affixed to the Side of the telescope tube, and is provided with the proper arrangement for insuring its ...

History and Description of Mr. Tebbutt's Observatory: Windsor, New South Wales (Classic Reprint) 2018, Forgotten Books

ISBN-13: 9781334031885

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