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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