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Theodolite - Ertel, 10 Inch Object Reg. No: ST 022211

Summary:
Theodolite, 10 inch circle, by Ertel & Sohn, Munich. Horizontal circle graduated to 5 minutes and vertical circle to 10 minutes.

This instrument was used for the Geodetic Survey of Victoria, 1858-71, which established the primary surveying points throughout the colony. Also used by Melbourne Observatory.
Acquisition Information:
Transfer from Melbourne Observatory, 1945
Discipline: Technology

More information

Tagged with: geodetic surveys, surveying apparatus instruments, theodolites
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 - Surveying
Tertiary Classification: angular measurement
Inscriptions: Marked 'Ertel & Sohn in Munchen' and 'S.G.O. 92' [ie Surveyor General's Office]
Maker: Ertel & Sohn, Munich, Bavaria, Germany
User: Melbourne Observatory, South Yarra, Victoria, Australia

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