What are the types of Magnetic compass ?

  1. Low freezing point about  -300C
  2. Small coefficient of expansion
  3. Does not discolor the card.
  4. Low relative density about 0.93

By immersing the card in a liquid, oscillations caused by vibration, rolling & pitching are damped, without loss of accuracy. The card therefore has a dead beat movement which is convenient.

INDERJEET SINGH
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