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A new and correct sea chart of the whole world showing the variations of the...

A new and correct sea chart of the whole world showing the variations of the compass as they were found in the
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Largest available format 4800 × 3999 px 4 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 4800 × 3999 px 406 × 339 mm 4.3 MB
Medium 1024 × 853 px 87 × 72 mm 1.3 MB

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IMAGE number
MMM7340787
Image title
A new and correct sea chart of the whole world showing the variations of the compass as they were found in the year 1700, 1702 (engraving)
Auto-translated text View Original Source
Artist
British School, (18th Century) / British
Location
National Maritime Museum, London, UK
Medium
engraving
Date
1702 AD (C18th AD)
Dimensions
57x69 cms
Image description

Creator: Mount & Page; Halley, Edmond 1 chart on 2 sheets. Hand coloured engraving, on modern backing sheets. This chart shows the results of the first British state-sponsored expedition with a purely scientific purpose. Because the earth's magnetic field is not uniform and, as a result, the mariner's compass points either side of north to a variable degree depending on the ship's position. To make navigation safer, Halley made an extensive series of comparisons between compass readings and determinations of north by astronomical observation. He plotted isogonic lines, joining points of equal magnetic variation.

Photo credit
© National Maritime Museum, Greenwich, London / Bridgeman Images
Image keywords
18th century / Africa / Asia / compass / tool / cartography / Europe / engraving / India / magnetism / world map / sea / ocean / Oceania / map / mzengraving / Indian Ocean

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