Iven filled the vessel with cold water.
Mara watched the measure disappear through the guarded opening.
“You’ve forgotten the useful part.”
“No.”
He closed the rated vessel, checked the coupling and set it in the test stand beside the service plate. The plate was hot from the training room’s ordinary boiler. The vessel was not.
Between them lay enough space for his left hand and a clear view of both gauges.
Plate, clamp, heat exchanger and pressure jet occupied his four active channels. He had changed the set before the lesson began, leaving the familiar movement and striking patterns in the library where they would remain until another job wanted them.
This job wanted heat.
