Amplitrol Electronics Ltd.

Amplitrol Electronics, Ltd. c. 1960-1970's. This timer is probably not a bank alarm timer but is included because it does make use of a time lock movement made originally for Yale & Towne by the Swiss maker Saint Blaise. The wiring diagram shows how this timer worked, but without having the information of the rest of the system connected to the wiring block one cannot say for sure. The timer switch located in the center of the diagram is a hand wound device that has a maximum duration of 20 minutes as represented by the black knob on the upper portion on the device. This would have been set first to give the operator time to leave the premisis. Then the Yale and Town timer would have been set to the number of hours that the overall alarm system was to be armed. Winding this movement causes the limit switch to actuate. Once the twenty minute time ran out the circuit is broken controlled by that timer and the system is armed.