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The Glass Meridian Circle

Published online by Cambridge University Press:  04 August 2017

E. Høg
E. Høg*
Affiliation:
Copenhagen University Observatory

Abstract

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Some aspects of the design for a Glass Meridian Circle with 24 cm aperture are presented and discussed. Tangential ventilation will be used to minimize tube refraction. The air for the ventilation will be filtered and it will provide a clean atmosphere around all optical and critical mechanical components, thus improving reliability. The base frame and piers are particularly stable thanks to a sharp separation between parts with short and long thermal time constants. The instrument is compact and portable and it requires only a small dome.

Type
VI. Transit Circles and Astrolabes
Information
Symposium - International Astronomical Union , Volume 109: Astrometric Techniques , 1986 , pp. 413 - 419
Copyright
Copyright © Reidel 1986 

References

Gumerov, R.I., Pinigin, G.I.: 1986, This volume Google Scholar
Høg, E.: 1986, Internal Refraction in MCs, This volume Google Scholar
Høg, E.: 1971, Mitt. der Astron. Ges. Nr. 30, pp. 148 Google Scholar
Høg, E.: 1974, IAU Symp. No. 61, pp. 243 Google Scholar
Høg, E.: 1978, IAU Colloquium No. 48, pp. 259 CrossRefGoogle Scholar