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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 8

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the two horizontal [wires] by means of the declination tangent screw. When h>90, read the circle around three 90, 80, 70, etc., as the the circle were graduated from 0 to 180 For sub polar transits h=[q-co-p] and the star will enter the field from the east side instead of from the west as in the case of ordinary transits.
 
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