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The Vertical Card Magnetic Compass

 The Vertical Card Magnetic Compass

  • The floating magnet type of compass not only has all the errors just described, but also lends itself to confused reading.
  •  It is easy to begin a turn in the wrong direction because its card appears backward.
  • East is on what the pilot would expect to be the west side.
  • The vertical card magnetic compass eliminates some of the errors and confusion.
  • The dial of this compass is graduated with letters representing the cardinal directions,
  • numbers every 30°, and tick marks every 5°.
  •   The dial is rotated by a set of gears from the shaft-mounted magnet, and the nose of the symbolic aircraft on the instrument glass represents the lubber line for reading the heading of the aircraft from the dial.
  • Eddy currents induced into an aluminum-damping cup damp, or decrease, oscillation of the magnet.

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