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Backstaff from 'Seaman's Secrets', London, 1607

IMAGE number
UIS5095323
Image title
Backstaff from 'Seaman's Secrets', London, 1607
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Location
Science Museum, London, UK
Medium
engraving
Image description

Backstaff from 'Seaman's Secrets', London, 1607. Print of a diagram showing the way a backstaff or Davis quadrant, a navigational instrument, is used to measure the elevation of the Sun. Measured at Noon each day, this would allow a mariner to find their latitude at sea when out of sight of land. It is taken from 'Seaman's Secrets', published 1607 and reprinted in the Hakluyt Society's volume series (Vol 69, p 332). This work deals with various aspects of good seamanship as well as the methods available for nautical navigation. ©SSPL/Science Museum

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SSPL/UIG / Bridgeman Images
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Largest available format 2884 × 3508 px 1 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 2884 × 3508 px 244 × 297 mm 1.0 MB
Medium 842 × 1024 px 71 × 87 mm 811 KB

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