Piloting Vessels by Electrically Energized Cables

A summary of the historical development of audio frequency induction methods of piloting ships carrying coil receivers along current-carrying cables making the desired course is given. A number of experiments carried out at New London and in New York Harbor are described in detail. The design and mode of use of the cable and the receiving apparatus are fully discussed; and the practical applications of the various systems of audio frequency piloting are given.