Which type type of liquid used/ added in magnetic compass?

Two types of liquid used in magnetic compass:
  1. Mixture of distilled water and ethyl alcohol , Two part of distilled water and one parts of ethyl alcohol providing a fluid with low viscosity and small coefficient of expansion.
    • Distilled water will reduce evaporation in worm tropical climate.
    • Alcohol will reduce frizzing point of mixture in cold weather.
  2. Oily liquid
    • Provided additional flotation for card.
    • Lubricate the pivot.
    • Reduce motion on the card.
AMIT KUMAR
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