Chernikeff Log is a type of Speed Log which is used to measure the speed of a ship.
Features of Impeller Log:
- Impeller (a small propeller) fitted in a tube.
- Tube retracted into the hull when not required
- Impeller rotates when ship moves through water.
- Rotation of the impeller is converted into electric pulses.
- Higher the speed, faster the rotation of the impeller, more the number of pulses.
- The electric pulses are processed and show speed on an indicator on the bridge.