coil (koyl)

A winding or spiral structure; anything wound (e. g., wire), a loop. cold water c. A device by means of which cold may be applied to a part continuously by a coil of tubing (of rubber or flexible metal) laid on it, through which a stream of cold water is kept running. hot water c. The same mechanism as the cold water c, the water being used hot instead of cold, ice c, ice water c, JJeiter's c. See cold water c. induction c. Properly, the secondary c. of an apparatus for the development of induced currents of electricity; as commonly used, the whole apparatus. See induced electricity, primary c. The inner c. of an induction apparatus, through which the battery current pa es, resistance c. A c. or series of c's of doubled wire of known resistance; interposed in a galvanic circuit to diminish the strength of the current or to test the resistance offered by an object by comparison. Ruhmkorff's c. See under Ruhmkorff. [Old Eng., coile, coyle.l