At step five, the opening reached Sable, and the room watched a flat line.
The Sable branch had been at its reduced rate since the trial. A trickle, held there, waiting for Sable’s cold shell to wake. Now the opening order called for its first real pulse: the governor stepped up from the trickle to its working share, and the flow pushed out along the old line, past the valve gallery, past the sealed neighbor, out to the dead station at the edge of the old route.
Eshel moved the eighth lever.
“Branch seven,” he said. “Sable. First pulse. Stepping.”
The governor opened. Its cam slowed it, so the needle on the rack crept rather than swung. The buffer took the flow: the small chamber’s float rising in its window, then the throat, then the large chamber.
And the pulse went out along the line.
On the board, the Sable trace. Eshel had put it on the big slate beside the opening order, so the whole room could see it: the heat arriving at the station’s end of the line, as Ysol read it from the console and sent it through the relay.
The line was flat.
