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 20

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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 20

Comparison of the Alidade Level with the Vertical Circle. 
Loosen the two clamps on the instrument. Take hold of the alidade clamping screw with the right hand and the eye-end of the telescope with the left . Rotate the telescope until the gear of the circle is just opposite the gear of the [?]. Clamp the circle. [look?] thru the reading glass to see if the gears coincide and if they do not bring them into coincidence by means of the alidade tangent screw. Bring the telescope nearly horizontal and [?] a position that the south end of the bubble will be very near the south end of the scale but not off the scale. Clamp the axis so that it can be rotated slightly by means of the declination tangent screw. If the bubble is not yet in the position desired it may be put there by turning the declination tangent screw. Read on the divided scale the position of each end of the bubble and second it. The north end is always to be read first. Let N be

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Comparison of the Alidade Level with the Vertical Circle. Loosen the two clamps on the instrument. Take hold of the alidade clamping screw with the right hand and the eye-end of the telescope with the left . Rotate the telescope until the gear of the circle is just opposite the gear of the [?]. Clamp the circle. [look?] thru the reading glass to see if the gears coincide and if they do not bring them into coincidence by means of the alidade tangent screw. Bring the telescope nearly horizontal and [?] a position that the south end of the bubble will be very near the south end of the scale but not off the scale. Clamp the axis so that it can be rotated slightly by means of the declination tangent screw. If the bubble is not yet in the position desired it may be put there by turning the declination tangent screw. Read on the divided scale the position of each end of the bubble and second it. The north end is always to be read first. Let N be