The Canterlot Institute opened the west valve on a heat-draw out of the Ochre Reaches at dusk on Tuesday and filed the run complete at dawn. The Kiln Post weather stone read 94 on the Ash Scale at the opening and read 94 again when Bramble Holt signed off the board. In the same six hours a warm-water coil the marine desk had named Light Errand tightened over the Lantern Bight and came ashore at Port Sallow with a closed center.
Grant card 18-H specified the method in four lines. Three relay towers, Kiln Post, Red Saddle, and Hopper Bend, would carry a condensate sleeve of brine-cooled copper. The sleeve would lift heat out of the ground stones, hold it as a bound charge in the pipe, and vent the charge over open water south of the Bight. The vent was supposed to feed the forming coil until the coil lost its spin and dropped into an ordinary rain band. The card listed the western target as a return to 70, the ordinary hard-noon mark for the Reaches in this month. Hopper Bend was the middle join, where the sleeve narrowed to a brass cradle and a hoof-worked valve.
Director Pellin Harth said the lattice "met the card."
Holt had the Hopper Bend board from the opening hour. The sleeve pulled clean through the first three hours. Brine temperature in the jacket fell, the charge in the pipe rose, and the west stones held their number. At hour four the cradle split on a thumb-width seam. Brine flashed to vapor inside the jacket. Flow in the sleeve reversed at eleven hooves a minute, heat running back toward Kiln Post. Holt shut the west valve with a rag wrapped twice around the hoof and wrote the line in the shift book before calling the upstairs desk.
"The pipe came back hot enough to take the hair off my fetlock," Holt said. "I logged reverse flow, eleven hooves, valve shut. Their dawn sheet uses that same line as a completed export."
The parts log recorded the cradle as warm to the hoof and serviceable. A clerk crossed the seam with bureau twine and hung a paper fan on the knot. The fan's printed face still read KEEP COOL. Holt copied the twine onto the margin of the shift book, under the temperature, because the upstairs copy takes the right-hand column and leaves the margin.
Red Saddle's stone rose two notches during the reverse and stayed there. Iron water troughs on the dry farms west of Kiln Post were too hot for stock at first light. The Institute's dawn map shaded those same districts cleared and printed the shade in the pale blue used for a finished vent.
Light Errand had been carried on the marine sheet as an open moist lane. The lane acquired a center between the second and third hours of the draw, while the sleeve was still running forward. It reached the Port Sallow pier before midnight. Water stood at the third bolt on the gauge. A single gust lifted the salt-shed roof in one sheet and set it down in the customs lane. The Light Errand buoy, green pennant still bent on for routine moisture, was in a melon stall two streets above the high-water mark by first light. Stall keeper Sedge Marr rolled it under the awning after the pennant started marking the fruit.
"On their card, green is a drizzle," Marr said. "I scooped the stall out to the cobbles. The bell on it kept ringing."
Celestia University took card 18-H at midmorning and built the three-loop on a sealed pan in the closed bench, with new brine and a new cradle poured to the card's dimensions. Lumen Carr ran the working once, with the vent angle copied off the Hopper Bend drawing. The pan dropped nine notches. The air above the pan stayed still. The bench cradle finished whole. Carr marked the trial a mismatch to the field report and stopped the bench.
"Same loops, same brine, same angle," Carr said. "The pan went cold. Nothing turned. I sign what I can make happen in a second room."
The repeat remains unscheduled. At noon the Kiln Post stone still read 94. The green pennant was still knotted to the buoy under Marr's awning, and the salt-shed roof was still in the customs lane with the rope on it.
