delder wrote:
When we had a lot of schools with Electromechanical Master Clocks,
We would send 2 techs around an hour apart for Fall Back.
The first tech turned OFF the Clock and the Second tech would turn it on an hour later.
This also corrected the secondary clocks.
Sorry, a long way from photography!
Back in the days of analog electric clocks my dad would flip the main breaker to the house for exactly one hour. Voila! They were all moved back an hour. This didn't work in the spring, of course.