Common Pilotage. Name formerly given to that branch of navigation that deals with the conducting of a ship by methods that do not involve celestial observations and calculations. Now termed 'Pilotage'.
Common Whipping. Binding on end of rope, made by passing turns of twine from an inch or two from end and towards end. Finished oft' by passing end of twine under last few turns.
Commutator. Drum of insulated copper discs on shaft of dynamo. Used for converting alternating current to direct current. 2. Switch for reversing direction of current.
Companion. Hood, or covering, over a ladder leading from one deck to another.
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