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 14

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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 14

Second. The [wires?] of the reticle must be parallel to a plane perpendicular to the axis of the instrument. Direct the telescope to a small well defined and distant object and bisect it with the middle wire. More the telescope up and down [?thru[ a small angle. If the wire is in a plane perpendicular to the rotation axis it will bisect the object [thruout?] its entire extent. If the wire moves off from the object [?] the reticle must be rotated a little about the axis of figure of the telescope until the wire is in the right position. 
When the [wires?] have been thus adjusted for focus and perpendicularity, the reticle slide should be tightly clamped. The eye piece can be moved in and out at pleasure to secure distinct vision for different eyes, but it is essential that the distance between the object glass and the reticle remains constant.

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Second. The [wires?] of the reticle must be parallel to a plane perpendicular to the axis of the instrument. Direct the telescope to a small well defined and distant object and bisect it with the middle wire. More the telescope up and down [?thru[ a small angle. If the wire is in a plane perpendicular to the rotation axis it will bisect the object [thruout?] its entire extent. If the wire moves off from the object [?] the reticle must be rotated a little about the axis of figure of the telescope until the wire is in the right position. When the [wires?] have been thus adjusted for focus and perpendicularity, the reticle slide should be tightly clamped. The eye piece can be moved in and out at pleasure to secure distinct vision for different eyes, but it is essential that the distance between the object glass and the reticle remains constant.