Balta was the northernmost station of the zenith sector.
2.
He worked at Greenwich observatory with Ramsden's zenith sector and in 1837 he was engineer in charge of Woolwich Dockyard.
3.
A classic zenith telescope, also known as a "'zenith sector "'employs a strong altazimuth mount, fitted with levelling screws.
4.
Graham made for Edmond Halley the great mural quadrant at Greenwich Observatory, and also the fine transit instrument and the zenith sector used by James Bradley in his discoveries.
5.
His collimator was meant to replace a level, or plumb-line, in astronomical observations, and to furnish a ready and perfectly exact method of determining the position of the horizontal or zenith point on the limb of a circle or zenith sector.
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