It is a compass, intended to note the daily variations of declination, hence its name "compass of variations in declination". It is also called single-line magnetometer or Mascart declinometer
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Details
Title: Magnetic observatory
Creator: Jules Carpentier
Date Created: 1900
Physical Dimensions: H. 38 x L. 18 cm
Accessoires L. 18x l. 12,5 cm