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Unifilar variation compass and magnetometer, c 1840

Unifilar variation compass and magnetometer, c 1840
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Largest available format 3504 × 2339 px 1 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 3504 × 2339 px 297 × 198 mm 868 KB
Medium 1024 × 684 px 87 × 58 mm 801 KB

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IMAGE number
UIS5066225
Image title
Unifilar variation compass and magnetometer, c 1840
Auto-translated text View Original Source
Location
Science Museum, London, UK
Medium
object
Image description

Unifilar variation compass and magnetometer, c 1840. The balance point of a magnetic needle was of crucial importance when measuring the difference between geographic north (around which the earth spins) and magnetic north. This example, made of brass tipped with platinum, comes from a magnetometer made by Henry Barrow of London, in about 1840. The instrument was used by Sir John Richardson and William Pullen on the Arctic Expeditions searching for Sir John Franklin. ©SSPL/Science Museum

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SSPL/UIG / Bridgeman Images
Image keywords
compass

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