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18th century illustration showing a backstaff or English quadrant. 1776. The backstaff is a navigational...

IMAGE number
UIG5311564
Image title
18th century illustration showing a backstaff or English quadrant. 1776. The backstaff is a navigational instrument that was used to measure the altitude of a celestial body, in particular the sun or moon. When observing the sun, users kept the sun to their back (hence the name) and saw the shadow cast by the upper vane on a horizon vane. It was invented by the English navigator John Davis who described it in his book Seaman's Secrets in 1594
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Medium
drawing
Date
C18th AD
Image description

Date: 1776

Photo credit
Universal History Archive/UIG / Bridgeman Images
Image keywords
France / Europe / book / moon / weather Vane / 18th century / illustration / english / instrument / invention / shadow / navigator / navigation / sun / secrets / Seaman / measure / altitude / observing / 1776 / vane / particular / backstaff / english quadrant / backstaff / celestial body / john davis / 1594

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Largest available format 4488 × 4673 px 3 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 4488 × 4673 px 380 × 396 mm 3.4 MB
Medium 984 × 1024 px 83 × 87 mm 337 KB

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