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Stand & Horizontal Circle - Theodolite, Troughton & Simms, 10 Inch Object Reg. No: ST 022213 1

Stand and horizontal circle of 10 inch theodolite made by Troughton & Simms, London. Used at Melbourne Observatory.
Horizontal circle & vertical arcs are divided on silver to 5 minutes. Two opposing micrometer microscopes rigidly fixed to the outer axis are used for reading the horizontal circle. Illuminated axis, lamp & bracket. Tangent screws with spring. Achromatic telescope. Erect inverting & diagonal eyepiece. Stride level.
Acquisition Information:
Transfer from Melbourne Observatory, 1945
Discipline: Technology

More information

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, Troughton & Simms, Instrument Makers, Geodetic Survey of Victoria, 1858-1872
Primary Classification: SURVEYING & NAVIGATION
Secondary Classification: Optical - Surveying
Tertiary Classification: angular measurement
Inscriptions: Marked 'Troughton & Simms London'.
Maker: Troughton & Simms, London, Middlesex, England, Great Britain
User: Melbourne Observatory, South Yarra, Victoria, Australia

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