Nera Brim opens sample jars, culvert flow notes and mill operating cards at the west discharge culvert. Before anyone changes a mark, the crew checks the culvert flow rises after the late furnace rinse. The cinder winter period sets the pace of the work.

The page holds 17 samples with a time, flow and operating condition attached. Nera Brim reads the preceding count, 16, before the next line is entered. A number without a date would not tell the next crew what changed.

The mill tests at the end of a run. Residents ask for a sample during the rinse as well as after it. Here the difference is visible between the posted rule and the route, service or shift just beyond the door.

The office posts the change and records its first operating measure. The responsible office has begun the follow-up set by the board, which retained the existing rule and published the operating record.

The shift closes with the source page attached to the board. The next file uses a new date and scope.