Experiences with the U.S. Naval Observatory glass circles

Details Experiences with the U.S. Naval Observatory glass circles Experiences with the U.S. Naval Observatory glass circles

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...114...95r&link_type=abstract

Astronomy and Astrophysics, vol. 114, no. 1, Oct. 1982, p. 95-101.

Astronomy and Astrophysics

Astrophysics

3

Astrometry, Astronomical Observatories, Optical Measuring Instruments, Glass, Production Engineering

Scientific paper

It has been found in the course of U.S. Naval Observatory experience with the circles used to determine the declination position angle of a meridian circle that the quality of glass circle division lines is superior to those of conventional metal circles. Such quality is important when photoelectric scanning devices are used to read the circle. Analyses of the diameter corrections obtained with a number of the glass circles are given, and a method is introduced which allows the monitoring of circle stability without taking an entire set of diameter corrections.

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