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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 36

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Collimation The time of collimation in the straight line joining the optical center of the object-glass with the point of the middle vertical wire mid way between the two horizontal ones. The error of collimation is the angle between the line of collimation and the line thru the optical center of the object glass at sight angle to the rotation axis. Adjustments of the Transit Instrument. The foregoing description of the transit instrument shows that to be in perfect adjustment it must satisfy the following conditions: 1st. The rotation axis must be exactly horizontal. 2d. The line of collimation must be perpendicular to the rotation axis. 3d. The rotation axis must point accurately east and west. By satisfying the first condition the
 
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