Time clock systems

For distribution of time throughout the entire country there is a system of master clocks in the important centres to which the correct time is transmitted over telegraph circuits from a supreme master clock, which is checked daily by astronomical observations. From these master clocks the time is sent out once a day to railways, factories, and such organizations where a system consisting of clocks operated from one master clock is used. The master clock is a high-grade self-winding clock, having a number of contacts closing at intervals for operating the secondary clocks. Where a large number of secondary clocks are to be worked from one master, local master clocks are installed. Synchronising contacts on the master clock closing once every hour bring all the local master clocks into synchronism. A further set of contacts on the master or local master clocks close once every half-minute and operate the electromagnetic secondary clocks. Contacts closing ten times a minute operate switchboard clocks reading to one-tenth of a minute, and contacts closing once a minute operate the time stamps. A 24-volt, 60-ampere battery will operate for two days a system consisting of two master clocks, 24 secondary clocks, 24 switchboard clocks, and 50 time stamps.