Accession No
0817
Brief Description
sextant, pocket marine surveying-type, by C. E. Kraft, Austrian, 1830 (c)
Origin
Austria; Vienna
Maker
Kraft, C. E.
Class
surveying
Earliest Date
1800
Latest Date
1850
Inscription Date
Material
metal (brass, silver, steel); glass; wood (boxwood); cloth (velvet); hide (morocco leather)
Dimensions
box length 170mm; breadth 188mm; height 52mm (breadth 150mm; 28-1-2000)
Special Collection
Robert Whipple collection
Provenance
Purchased by Robert Stewart Whipple from Charles Benton, London, England, on 20/08/1936.
Inscription
‘C.E. Kraft, in Wien’
Description Notes
Sextant, pocket marine surveying-type, by C. E. Kraft, Austrian, 1830 (c).
Small brass sextant (surveying). Adjustable index mirror. Adjustable horizon glass (by knurled brass knob). Screw-in brass telescopic sights. Brass index arm, with silvered vernier and brass clamp. Scale divided [-10] - 130 numbered by 10, divided to 1˚. Steel point fixed to zero end of scale forms pair of dividers with similar point on extension to index arm. Blued steel screws. Boxwood and brass screw-in handle. Green velvet lined fitted red morocco case (with brass (?) decoration around inside edge; 28-1-2000).
Condition: good; complete.
References
Joshua Nall; ‘Pundits and The Great Game’; Explore Whipple Collections online article; Whipple Museum of the History of Science; University of Cambridge; 2020: https://www.whipplemuseum.cam.ac.uk/explore-whipple-collections/astronomy-and-empire/local-knowledge/pundits-and-great-game
Events
Description
The term “sextant” refers to an arc of 60°. The sextant is a portable instrument that measures angles between distant objects. It is an instrument that has been used in the fields of astronomy, surveying and navigation.
This particular instrument was designed for surveying. The sextant is adjusted to bring into coincidence two points (hills or church steeples for example), one seen directly through the telescope, the other by reflection from the mirror. The angle measured is the same as between the divider points, and can be directly put down on paper.
04/08/2008
Created by: Dr Anita McConnell on 04/08/2008
FM:42765
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