“Why call it a test needle?” Seyun asked, stepping back to the worktable and looking down at the narrowed six-inch spike Osen had shaded at the heart of the third sketch. “A control valve or a balance pin would describe what it does to the pressure. ‘Test’ is trial language.”
Osen Tal tapped the base of the spike with the side of his charcoal stick. There, a small external brass latch protruded slightly into the service recess at the foot of the pillar stone base.
“Because the Court artificers borrowed the design from the grand check furnaces in the capital,” Osen explained. His voice dropped into a dry recitation of institutional history. “When six test judges test a tester’s breath or temper a spirit vessel together, their separate inputs pass through a test needle. The needle only allows a channel to open or close when the combined pressure matches the preset standard of the head bench. If one judge’s hand wavers—or if the vessel inside tries to surge on its own—the needle refuses the variance and locks the flow to the common average.”
Seyun stood very still beside the table. The memory of Ash Reed’s winter check hall rose in his chest. The smell of wet snow on outer students’ boots, Elder Hesh’s trembling fingers hiding behind his sleeves, and Joren sitting on the raised platform. Meanwhile, a borrowed Aperture Court fire spirit forced a false Bronze sheen through his spirit veins. Even there, at the lowest rung of the…
