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

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.
Description:
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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