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True Course Finder', 1876

IMAGE number
UIS5080421
Image title
True Course Finder', 1876
Auto-translated text View Original Source
Location
Science Museum, London, UK
Medium
object
Image description

True Course Finder', 1876. This instrument is a specialised circular slide rule, on which magnetic heading, leeway, deviation, and variation may be entered and from which a true course may be read, without arithmetical calculation. Before the invention of these devices, magnetic compasses could indicate the 'magnetic' north pole but sailors had to use arithmetical formulae to calculate the 'true' north. The 'True Course Finder' performed these calculations automatically and made corrections for any leeway, deviation and variation. It was patented by W H Roberts. ©SSPL/Science Museum

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SSPL/UIG / Bridgeman Images
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Not available to clients invoiced in the UK
Largest available format 3504 × 3431 px 2 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 3504 × 3431 px 297 × 290 mm 1.9 MB
Medium 1024 × 1003 px 87 × 85 mm 1.4 MB

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