Theodolite - Ertel, 7 Inch, 1850s

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Summary:: Theodolite, 7 inch circle, made by Ertel & Sohn, Munich, 1850s. Used at Melbourne Observatory.

A theodolite is used in surveying to measure the angle between distant objects as seen from a given location.
Acquisition Information:: Transfer from Melbourne Observatory, 1945

Discipline:	Technology
Dimensions:	360 mm (Height), 270 mm (Width), 225 mm (Length)

Tagged with:	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:	Horizontal circle marked 'Ertel & Sohn in re Munchen'.
Maker:	Ertel & Sohn, Munich, Bavaria, Germany, 1850s
User:	Melbourne Observatory, South Yarra, Victoria, Australia