World-Wide Clock Synchronization

To satisfy already existing needs for higher precision in various time measurements, a world-wide system of synchronized clocks is required. One possible method for accomplishing such a system, the transportation of operating precision clocks, is discussed. Particular consideration is given to the use of atomic clocks in this connection, and methods of maintenance of synchronization by means of phase tracking of a central master clock via VLF transmissions are reviewed. Project WOSAC, a Signal Corps project of world-wide synchronization of atomic clocks based upon the principles discussed, is outlined and results already achieved are described.