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The Standard Electric Time Company was an early entry into the business of providing master clock systems for schools, factories, governmental office buildings and other businesses requiring strict adherence to schedules. Master clocks are generally designed to be very accurate timepieces. Many have temperature controlled pendulums which provided the required timekeeping accuracy despite the absence of a controlled environment which was unheard of in most buildings until quite recently. The Standard electric master clocks are recognized by the presence of the paper loops used for event programming to control bells, whistles and other annunciators used to signal the beginning and ending of classroom, work or other timed sessions. Control of multiple remote slave or secondary dials within a building or campus was achieved using low voltage wiring for each dial. These and other maker's master clocks, although wound once each minute, will generally run about an hour during electrical power outages. However, the remote or slave dials will fail without power, hence most master clock systems had some provision for a battery back-up power source. The small "pilot dials" seen in this example are each connected with a dedicated slave clock network reflective the status of the remote slave clocks. |
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