Summary

Artifical horizon used at Melbourne Observatory, and also in Geodetic Survey of Victoria.

The artificial horizon was used, especially in field observations, to establish the elevation of the sun or a star when the horizon was not visible. The vertical angle between the sun or star and its reflection in the mercury was measured; this was halved to establish the angle of elevation above the horizon.

Physical Description

Black glass in rectangular brass stand with 3 levelling screws. With fitted wooden box. Spirit level missing.

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