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Double A-frame sextant of 12 inch radius, 1788-1803

IMAGE number
UIS5060549
Image title
Double A-frame sextant of 12 inch radius, 1788-1803
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Location
Science Museum, London, UK
Medium
object
Image description

Double A-frame sextant of 12 inch radius, 1788-1803. This brass sextant was made by the London instrument makers John and Edward Troughton. With its tripod stand and telescopic sights, it was designed for use in navigation, surveying and hydrography. A separate tube can be used for plain sight. Sextants could be used to find the correct latitude by measuring the height of the midday Sun or a suitable star at night. Longitude could also be found by determining local noon from the maximum height of the Sun and comparing this time with a chronometer set to a fixed meridian. Alternatively, the angle between the fixed stars and the Moon could be measured to find longitude, but only after lengthy calculations using tables in the Nautical Almanac. ©SSPL/Science Museum

Photo credit
SSPL/UIG / Bridgeman Images
Image keywords
18th century / 19th century / astronomy / thing / tool / Weights And Measures / measure / navigator / sextant / astronomy / Science

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Largest available format 2487 × 3504 px 1 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 2487 × 3504 px 211 × 297 mm 809 KB
Medium 727 × 1024 px 62 × 87 mm 784 KB

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