zenith telescope

British

noun

an instrument used to determine the latitude of stars, similar to the meridian circle but fitted with an extremely sensitive level and a declination micrometer

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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zenith telescope

Now the zenith telescope does away with the divided circle, and substitutes the measurement micrometrically of the quantity Z′ − Z. In fig.

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" by Various

The zenith telescope is made in various sizes from 30 to 54 in. in focal length; a 30-in. telescope is sufficient for the highest purposes and is very portable.

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" by Various

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