Prime-vertical transit instrument


  • Webster's Revised Unabridged Dictionary
    • Prime-vertical transit instrument a transit instrument the telescope of which revolves in the plane of the prime vertical, -- used for observing the transit of stars over this circle.
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In literature:

The transit instrument is also used in the prime vertical for the determination of latitudes.
"Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6" by Various