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 13

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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 13

II. Focus the objective by directing the telescope to some distant well defined terrestrial object (not less than a mile away) and placing the [wires?] in the principal focus of the objective by sliding the [tick?] carrying the [wires?] and eye piece, in the main tube until an image of the object seen on one of the [wires?] will remain on the [wire?] when the position of the eye is changed . The object of the adjustment viz, to bring the image formed by the objective into coincidence with the [wires?], is then accomplished. If the eye piece has been properly focused, this position of the objective will also be the position of most distinct [vision?] for both the [wires?] and image 
The adjustments I and II are to be made by daylight, but at night the focus of the objective will need to be corrected [?] a star as the object (Unless the focus is made [nearly?] night by daylight none but the brightest star will be seen at all at night.

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II. Focus the objective by directing the telescope to some distant well defined terrestrial object (not less than a mile away) and placing the [wires?] in the principal focus of the objective by sliding the [tick?] carrying the [wires?] and eye piece, in the main tube until an image of the object seen on one of the [wires?] will remain on the [wire?] when the position of the eye is changed . The object of the adjustment viz, to bring the image formed by the objective into coincidence with the [wires?], is then accomplished. If the eye piece has been properly focused, this position of the objective will also be the position of most distinct [vision?] for both the [wires?] and image The adjustments I and II are to be made by daylight, but at night the focus of the objective will need to be corrected [?] a star as the object (Unless the focus is made [nearly?] night by daylight none but the brightest star will be seen at all at night.