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Altitude & Azimuth Instrument - Troughton & Simms, 12 Inch Reg. No: ST 029083
- Altitude and azimuth instrument, 12 inch circle, made by Troughton & Simms, London.
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.
- Circles graduated on silver & read by verniers.
In two wooden boxes: 1. stand and horizontal circle; 2. telescope and vertical circle.
- Acquisition Information:
- Transfer from Melbourne Observatory, 1945
|Dimensions:||70 cm (Height), 38 cm (Width), 38 cm (Length)|
|Tagged with:||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. 103". [ie Surveyor General's Office]
Labels inside boxes: "R. SKILTON, INSTRUMENT MAKER".
|Maker:||Troughton & Simms, London, Middlesex, England, Great Britain|
|User:||Victoria: Geodetic Survey of Victoria, Victoria, Australia, 1858-1871|
|User:||Melbourne Observatory, South Yarra, Victoria, Australia|
This item is part of the following themes:
- 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