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Tilt compass. This apparatus includes an azimuth circle (lower centre), a compass needle and magnifying glasses (centre), a screw to adjust the needle (centre right), and a vertical circle (behind needle). This device allows compass readings to be taken in an inclined plane, which can be helpful for some forms of navigation or in locations where the magnetic field itself is tilted. Artwork from the eighth volume (second period of 1891) of the French popular science weekly 'La Science Illustree'.
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