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Theory of the astronomical transit instrument applied to the portable transit instrument Wuerdemann no.26: a compilation from various authorities, with original observations by Harry Edward Burton, 1903

Theory of the astronomical transit instrument applied to the portable transit instrument Wuerdemann no. 26: a compilation from various authorities, with original observations by Harry Edward Burton, 1903, Page 11

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greater accuracy by taking their mean instead of depending upon a single observation. The two horizontal wires are for marking the center of the field. The telescope should be set so that the star's image will pace across the field midway between them. In the figure, S is in star entering the field from the right between the horizontal wires. A, B, C, D3, E3, F, andG are seven vertical wires symmetrically placed and the time at which s, the star's images is directed by each may be moted. The mean of the times is probably more nearly the correct time of transit over the middle wire than the time obtained from the transit across the middle wire alone, would be.
 
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