Compass Card. The rose is of the same type as a NG-MC-877-B, but the cap is provided with a gem, presumably agate with hole for the pen at the bottom: turning the rose was improved by the materials used, while fluctuating through the Propagation of the friction surface of the gem was reduced. The rose can be rotated within an outer edge, on which a scale is arranged in degrees by quadrant; This was to compensate the magnetic variation (the angle between the actual north and the magnetic north).

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Size: 2500px × 2306px
Photo credit: © BTEU/RKMLGE / Alamy / Afripics
License: Licensed
Model Released: No

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