electromagnetic watch clock

An apparatus consisting of a magnet, with a recording-dial, clock-works, and a signal-bell; from this run wires., one to each of the banks or other offices under guard where watchmen are employed, whose duty it is to visit each bank at stated times during the night and give signals, which are recorded on the dial of the clock in the fire-alarm office, showing the time that the signal was given from any particular bank or office. If the signal is not given within five minutes after the appointed time, the man on duty at the fire-alarm office communicates with the office of the superintendent of police, and an officer is immediately dispatched to the point from which no signal has been sent.