Start with clock calibration cards and service boards that use the signal. It is the source used to decide how a service announces its time while the public clock is being calibrated; it is not the decision itself. The rule only works if the source describes conditions at the civic clock at South Arch.
Known: the current file counts 41 service boards with a matching calibration date, compared with 41 in the prior window. Asite visit checks the service during the hours residents use it. The entries have dates and a named clerk.
Disputed: The clock keeper trusts the calibration card. Residents rely on the displayed signal at the route entrance. One side emphasizes the posted total; the other points to the clock is adjusted while transit notices remain posted.
Why it matters: the decision determines which residents can rely on the service and which staff must carry out the change. The file does not settle that by itself.
Next: The Year second, early thaw window 1 file remains open for its scheduled decision. The clock office will post the calibration window on every connected service board.
