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 3

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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 3

to make them.
The straight line which passes there the centers of the pivots in the rotation axis.
The pivots rest in two fixed forks called the wyes(Y's), and the surface upon which  the pivots rest are slightly convex. The Y bearings are used instead of round bearings in order to keep the pivots from rolling as the instrument is turned.One of the Y's can be moved a little in azimuth to make the axis point east and west. Each Y is united to the top of a fixed cast iron standard and the standards are joined to an iron base-plate. The base-plate rests upon three foot-screws and these in turn rest upon a firm support, such as a pier of brick or stone. The foot-screws are used in putting the instrument into the meridian and leveling it, the final adjustment in azimuth being made by means of fine motion screw which moves one of the Y's. 
Note: The length of the telescope of transit instrument (Wurdemann No. 26 is) about 48 cm the length of the axis about 20 cm and the weight of telescope and axis about 3 kg

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to make them. The straight line which passes there the centers of the pivots in the rotation axis. The pivots rest in two fixed forks called the wyes(Y's), and the surface upon which the pivots rest are slightly convex. The Y bearings are used instead of round bearings in order to keep the pivots from rolling as the instrument is turned.One of the Y's can be moved a little in azimuth to make the axis point east and west. Each Y is united to the top of a fixed cast iron standard and the standards are joined to an iron base-plate. The base-plate rests upon three foot-screws and these in turn rest upon a firm support, such as a pier of brick or stone. The foot-screws are used in putting the instrument into the meridian and leveling it, the final adjustment in azimuth being made by means of fine motion screw which moves one of the Y's. Note: The length of the telescope of transit instrument (Wurdemann No. 26 is) about 48 cm the length of the axis about 20 cm and the weight of telescope and axis about 3 kg