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Artificial Horizon - Surveyor-General's Office, Victoria Object Reg. No: ST 022153

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.
Black glass in rectangular brass stand with 3 levelling screws. With fitted wooden box. Spirit level missing.
Acquisition Information:
Transfer from Melbourne Observatory, 1945
Discipline: Technology
Dimensions: 3 cm (Height), 10 cm (Width), 12 cm (Length)

More information

Tagged with: artificial horizons, geodetic surveys, surveying apparatus instruments, williamstown observatory
Themes this item is part of: Melbourne Observatory Collection, Engineering Collection, Science & Measurement Collection, Transport Collection, Positional Astronomy at Melbourne Observatory, Weights & Measures at Melbourne Observatory, Melbourne Observatory & Standard Time in Victoria, Astrographic Catalogue, Transits of Venus, 1874 & 1882, Buildings at Melbourne Observatory, Star Observations & Personal Equation, Meteorology at Melbourne Observatory, 1863-1908, Melbourne Observatory, 1863-1944, Geodetic Survey of Victoria, 1858-1872
Primary Classification: SURVEYING & NAVIGATION
Secondary Classification: Optical
Tertiary Classification: artifical horizons
Inscriptions: Base inscribed 'S.G.O. no 34'. SGO= Surveyor-General's Office, and indicates the instrument was probably used in the Geodetic Survey of Victoria.
User: Melbourne Observatory, South Yarra, Victoria, Australia

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