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Dip Circle - Kew Pattern, Henry Barrow & Co, circa 1860 Object Reg. No: ST 022128

Summary:
Dip circle made by Henry Barrow & Co, London. Kew pattern, No. 41, circa 1860. Used at Melbourne Observatory.

This was used to measure the total force as well as the inclination to the horizontal of the earth's magnetic field.
Description:
Contents from List of Parts Field:
Dip circle
Wooden box
Leather strap
Dip needle

Circle divided to 0.5 degrees, and vernier divided from 0 to 30, enabling minutes of arc to be read off.
Acquisition Information:
Transfer from Melbourne Observatory, 1945
Discipline: Technology
Dimensions: 23.00 cm (Height), 24.00 cm (Width), 30.00 cm (Length)
Dimension Comment: Wooden box dimensions.

More information

Tagged with: dip circles, geophysical apparatus instruments, magnetic instruments
Themes this item is part of: Magnetic Observations at Flagstaff & Melbourne Observatories, Melbourne Observatory 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: PHYSICAL SCIENCES
Secondary Classification: Geophysics - Geomagnetism
Tertiary Classification: measuring equipment
Inscriptions: Marked on circle "HENRY BARROW & CO. 26 OXENDON ST. LONDON". "No. 41"
Marked on wooden frame "327"
Maker: Henry Barrow & Co, London, Middlesex, England, Great Britain, circa 1860
User: Melbourne Observatory, South Yarra, Victoria, Australia, circa 1860

Comments

aracelis velazquez Posted on 28 Jun 2010 7:05 AM
We came across a Henry Barrow & Co. London sextent It was well used and it was used at the fermi lab and ended up at the University of Chicago.

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