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Altitude & Azimuth Instrument - Troughton & Simms, 12 Inch, circa 1836 Object Reg. No: ST 022215

Altitude & azimuth instrument, 12 inch circle, made by Troughton & Simms, London, circa 1836

This instrument was used for the Geodetic Survey of Victoria, 1858-71, which established the primary surveying points throughout the colony. Also used at Melbourne Observatory.
Altitude circle 11 inches and azimuth circle 12 inches. Circles graduated on silver every 10 minutes & read by verniers.
In two wooden boxes: 1. stand and horizontal circle; 2. telescope and vertical circle.
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: Troughton & Simms, Instrument Makers, Melbourne Observatory Collection, Engineering Collection, Science & Measurement 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 "S.G.O. 100" [ie Surveyor General's Office]
Maker: Troughton & Simms, London, Middlesex, England, Great Britain, circa 1836
User: Victoria: Geodetic Survey of Victoria, Victoria, Australia, 1858-1871
User: Melbourne Observatory, South Yarra, Victoria, Australia, 1863 or later

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