Telescope, Horizontal

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Telescope, Horizontal

 

a telescope whose optical axis is stationary and fixed on the plane of the horizon (usually in a north-south direction).

The horizontal telescope is used primarily for observing the sun and moon and, less often, the planets and stars. In a horizontal telescope a system of plane mirrors, including a mobile mirror moved by a clockwork mechanism (usually electric) reflects the light of a moving heavenly body constantly along the optical axis of the stationary telescope. The objective of a horizontal telescope, which can be a mirror (concave parabolic and, with a small aperture ratio, spherical) as well as a lens, projects the image of a heavenly body on a photoreceptive instrument, such as a spectrograph, a spec-trohelioscope, a spectroheliograph, or a magnetograph.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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