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2. Notice of the Catadioptric Altitude and Azimuth Circle

Published online by Cambridge University Press:  16 March 2015

Edward Sang Esq.
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Extract

This little instrument differs from the ordinary theodolite in the means by which the direction of the object under examination is indicated.

The simplest contrivance for marking the direction of a distant object is a straight rod. This, with the very obvious improvement of studs at the ends, was the only instrument available to the ancients for astronomical observations; it is yet employed in gunnery, and even by surveyors in the plain-table and cross-staff.

Type
Proceedings 1860-61
Information
Proceedings of the Royal Society of Edinburgh , Volume 4 , 1862 , pp. 528 - 532
Copyright
Copyright © Royal Society of Edinburgh 1862

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