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Theodolite - Ertel, 13-inch x 9-inch, Ertel & Sohn, Munich, Germany, 1850s Object Reg. No: ST 022212

Summary:
Theodolite, 13 inch horizontal circle and 9 inch vertical circle, by Ertel & Sohn, Munich. Horizontal circle is graduated to 5 minutes and vertical circle to 15 minutes.

It is likely that this is the 'Universal Instrument' by Ertel listed by George Neumayer as part of the instrumentation at Flagstaff Observatory, Melbourne in 1858. The instrument was used to determine the astronomical meridian, to be used as part of Neumayer's measurement of changes in the Earth's magnetic elements.
Description:
2 boxes: 1. stand and horizontal circle; 2. telescope and vertical circle.
Acquisition Information:
Transfer from Melbourne Observatory, 1945
Discipline: Technology
Dimensions: 63 cm (Height), 63 cm (Width), 63 cm (Length)
Dimension Comment: Dimensions will vary slightly depending how the theodlite is displayed relatiev to the wooden base.

More information

Tagged with: surveying apparatus instruments, theodolites, von guerard
Themes this item is part of: Flagstaff Observatory, 1858-1863, Georg Balthazar Neumayer, Scientist (1826-1909), 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, Melbourne Observatory, 1863-1944, Geodetic Survey of Victoria, 1858-1872, Magnetic Observations at Flagstaff & Melbourne Observatories
Primary Classification: SURVEYING & NAVIGATION
Secondary Classification: Optical - Surveying
Tertiary Classification: angular measurement
Inscriptions: Telescope lens marked: 'Merz, Ulzschneider and Fraunhofer in Munchen'.
Maker: Ertel & Sohn, Munich, Bavaria, Germany, 1850s
User: Melbourne Observatory, South Yarra, Victoria, Australia, post 1863
User (Probable): Flagstaff Observatory, Melbourne, Victoria, Australia, 1858-1863
User (Probable): Georg Neumayer - Flagstaff Observatory, Melbourne, Victoria, Australia, 1858-1863
References: George Neumayer, 'Description and System of Working of the Flagstaff Observatory,' Transactions Philosophical Institute of Victoria, v. 3, 1858.

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