DIY History | Transcribe | Scholarship at Iowa | 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 34

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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 34

seconds of time we must divide by 15, giving 1/120 (ΣW - ΣE) 6[superscript]s[/superscript].07, or 0[superscript]s[/superscript].0506 (ΣW - ΣE). The number 0[superscript]s[/superscript].0506 (=µ) is called the level constant factor and is computed once for all. We shall take µ=0[superscript]s[/superscript].05. Then in the case of the foregoing eight level readings we shall have as the inclination of the axis expressed in seconds of time, -5x0[superscript]s[/superscript].05, or -0[superscript]s[/superscript].25. The east end of the axis being too high, the transit of a star across the meridian is observed too late. So when the difference in the readings is in favor of the left-hand column it is negative, and when in favor of the right-hand it is positive, where the east end readings are in the left-hand column and the west end readings are in the right-hand. In reading the level and recording the readings as in the foregoing manner, it will be convenient to read the east end first. The number -0[superscript]s[/superscript].25 is denoted by b[superscript]s[/superscript]; i.e. b[superscript]s[/superscript]=µ (ΣW - ΣE) = 0[superscript]s[/superscript].05 (ΣW - ΣE).

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seconds of time we must divide by 15, giving 1/120 (ΣW - ΣE) 6[superscript]s[/superscript].07, or 0[superscript]s[/superscript].0506 (ΣW - ΣE). The number 0[superscript]s[/superscript].0506 (=µ) is called the level constant factor and is computed once for all. We shall take µ=0[superscript]s[/superscript].05. Then in the case of the foregoing eight level readings we shall have as the inclination of the axis expressed in seconds of time, -5x0[superscript]s[/superscript].05, or -0[superscript]s[/superscript].25. The east end of the axis being too high, the transit of a star across the meridian is observed too late. So when the difference in the readings is in favor of the left-hand column it is negative, and when in favor of the right-hand it is positive, where the east end readings are in the left-hand column and the west end readings are in the right-hand. In reading the level and recording the readings as in the foregoing manner, it will be convenient to read the east end first. The number -0[superscript]s[/superscript].25 is denoted by b[superscript]s[/superscript]; i.e. b[superscript]s[/superscript]=µ (ΣW - ΣE) = 0[superscript]s[/superscript].05 (ΣW - ΣE).