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What Elmer A. Sperry invented?

  • A.Hydroplane
  • B.Hydraulic turbine
  • C.Magnetic compass
  • D.Gyrocompass

Answer: D

Elmer Sperry invented the gyrocompass.

Patented in 1908, it uses a spinning gyroscope to find true north rather than magnetic north, and is unaffected by the iron of a ship's hull. It made accurate navigation in steel warships possible.

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