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Dip needles for the Dollond dip circle, 1820

Dip needles for the Dollond dip circle, 1820
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Not available to clients invoiced in the UK
Largest available format 3504 × 2300 px 1 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 3504 × 2300 px 297 × 195 mm 1.1 MB
Medium 1024 × 672 px 87 × 57 mm 659 KB

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IMAGE number
UIS5066211
Image title
Dip needles for the Dollond dip circle, 1820
Auto-translated text View Original Source
Artist
Unknown
Location
Science Museum, London, UK
Medium
object
Image description

Dip needles for the Dollond dip circle, 1820. Dip circles are used to measure the angle between the direction of the earth's magnetic field and the horizontal at any point on the earth's surface. A freely-suspended magnetic needle lies horizontal only at the magnetic equator, where the attraction to the poles is equally balanced. Elsewhere, the needle dips to an angle depending on the distance from the nearest magnetic pole, and vertically at the poles. Scientists frequently took dip circles on field expeditions from the 18th century onwards. This example was made by Dollond of London. ©SSPL/Science Museum

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SSPL/UIG / Bridgeman Images
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