Time services of the telegraph companies

THREE CLASSES of time service are distributed by the telegraph companies. The first of these, commonly known as “noon beats” comprises the transmission during a three-minute period ending at noon eastern standard time of a series of electrical impulses originating from the naval observatory at Washington, D. C. This service is used very largely for correcting local master clocks throughout the United States once each day. The second time service commonly known as “jewelers´ beats” comprises a similar transmission throughout the day of a series of coded impulses distributed in each locality by a master clock. These beats are used principally by jewelers for regulating timepieces.