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.