electrical instrument for transmitting time signals
• (n.) An instrument signaling the correct time to distant points by electricity.
Chron'o·pher noun [ Greek ... time + ... to carry.] An instrument signaling the correct time to distant points by electricity. 
chronopher 1. A device that generates standard time signal pulses from a clock or other timing mechanism. 2. An apparatus for the distribution of electric time-signals.
an instrument for transmitting time signals electronically.