The transition of the factory from wood to metal parts brought a new kind of noise to the riverbank—a heavy, localized shriek that sounded like an iron gate being dragged across limestone flagstones. The timber sills of the Great Hall of Wheels, though cut from green oak logs twelve inches square, groaned under the weight of the new manganese axle. The wood bled sap under the pressure, the pale, sweet fluid mixing with the dark linseed oil and the black graphite grease Wat's apprentices smeared onto the housing every twenty minutes to keep the timber from catching fire.
Thomas stood on the lower inspection platform beneath the main gear train. The air inside the pit was freezing, thick with the spray of the tail-race and the wet, earthy smell of the river-silt that accumulated in the corners of the wheel-well. He held a tallow candle in his right hand, its greasy yellow flame guttering in the draft created by the spinning paddles outside.
He pulled the glass slab from his tunic, his left hand shielding the screen from the damp mist that drifted off the flume. His battery was steady at ninety-six percent, and the text relay showed the usual twenty-four-hour latency.
He opened the raw binary dump and scrolled through the unindexed columns of alphanumeric characters until he found the specific mechanical ledger he had marked during his night vigil regarding lead-alloy sleeve bearing tolerances. The data indicated that for a high-torque load, the composition required eighty percent lead, fifteen percent antimony, and five percent tin, with a pour temperature of three hundred and fifty degrees Celsius. It specified that if antimony was lacking, he must use pure lead extension slabs cast to four times the bearing surface, allowing for corrugated spiral oil channels an eighth of an inch deep.
Thomas looked up from the screen at the massive iron axle turning six inches above his head. The steel spindle was perfectly true, its surface slate grey and unmarked by the friction, but the lead sleeves Wat had cast from the western carters' pigs were already showing signs of extrusion. The soft, heavy metal was flaring outward at the edges like warm candle wax, pushed by the relentless torque of the thirty-foot water wheel outside.
"The metal is creeping, Thomas," Wat said, his voice muffled by the low clearance of the timber joists. He crawled through the opening from the forge lane, his leather kirtle soaked through with muddy river water, his single good eye glittering in the candlelight. He held a short, flat iron scraper in his right hand. "The lead is too soft on its own. It holds the steel smooth enough, and she doesn't screech like the bare oak did, but the weight is widening the seat. By the time the moon turns, the main gear will be sitting two inches low, and the teeth will start biting each other oblique."
"The lead lacks antimony to harden the crystal structure, Wat," Thomas said, locking the screen and tucking the device back against his wet ribs. "We don't have the southern ore yet to mix with it. We have to compensate with surface area. We need to pull the sleeves tomorrow and cast them double the length, using the three-inch iron dies we made for the water valves. If we spread the weight across twelve inches of lead instead of six, the soft metal will hold its shape long enough for the text to clear."
"That means stopping the looms for a full day, Thomas," Victoria said, her voice carrying down from the hatchway above. She was leaning through the opening, her hair wrapped in a clean linen square to keep it from the grease-drippings of the overhead pulleys. She held a long roll of parchment—the daily shipping log for the Oakhaven market. "The carters from the northern gate are already waiting with four teams. They have three loads of limestone blocks for Hamo's wall and two wagons of charcoal from the upper groves. If the wheels don't turn today, we can't pay them their scrip before the sun hits the ridge."
"The carters will wait because the grain is still in our granary, Victoria," Thomas said, climbing up the slippery ladder out of the pit. He stood on the dry floorboards of the main hall, where sixty mechanical shuttles were flying back and forth across the warp frames with a synchronized, deafening thump-clack that shook the dust from the window sills. "We don't run the system until it breaks; we run it to the limit of the tolerances. If that axle drops an inch while the drive belt is at full tension, it won't just split the oak frame—it'll tear the main iron gear off the shaft and kill every boy sitting within ten paces of the spindle."
He walked toward the counting room, his boots leaving dark, greasy tracks on the clean pine floor. The weavers didn't look up as he passed; they were completely absorbed by the speed of the frames, their hands moving with a practiced, automatic rhythm that had been learned on the factory floor over the last month. They were no longer the hesitant, fearful peasants who had stood in the mud of the southern pass with green ash poles; they were operators of an engine, their livelihood locked into the speed of the iron teeth.
He sat at the oak desk and pulled out the phone, checking the messaging interface against the dim light coming through the small window pane. A new text had completed its journey through the drift, the characters crisp and green against the black glass.
His mother wrote that the weather had turned cold again, the kind of damp chill that stays in the brickwork until the furnace is turned up. She had gone out to the garden that morning to pull the last of the dead tomato vines out of the boxes before the first frost hit. She found his old brass plumb-bob that he used for his summer project in the garage—the one with the green silk string he had knotted three times at the end. She mentioned leaving it on the kitchen windowsill next to the geraniums, noting how quiet the street was and that it felt like everyone was staying inside where it was warm. She closed by asking him to write when he could.
Thomas rested the side of his face against the cool wood of the desk, his mind dwelling on how effortlessly comfort was achieved in her world. In Denver, his mother could turn a plastic dial on the wall and an invisible stream of natural gas would keep the brickwork dry until spring. Here, the heat was a precious, calculated resource—something earned with a shovel and the sweat of six miners in the dark of the third pit. He was managing the warmth of an entire valley using nothing but the slag from the crucible furnaces and the waste-water from the water wheel, yet his mother was still checking the windows for a draft.
"Thomas," Elias said, entering from the courtyard with his ink-horn dangling from his lapel. His fingers were stained an intense indigo from the dye-vats, his leather kirtle spattered with grey lime-dust from the river-gate wall. "The scouts have returned from the southern landmarks. They say the Baron's riders have left the timber gate entirely. They've moved their horses back to the keep at Born, but they left three men behind at the crossroads with a long ash pole across the track. They aren't stopping the wool-wains, but they are writing the name of every carter who carries our paper scrip into their book."
"They're gathering data for the sheriff," Thomas said, his thumb scrolling past the letters on the display until the screen faded back to dark. "The Baron wants to know exactly how many horses are coming into this valley before he goes to the King for the levy. He thinks he can tax the scrip at the city gates."
"And can he?" Victoria asked, stepping up to the desk with her ledger wide.
"He can tax the silver if he can find it," Thomas said, standing up from his chair, his cloak sweeping the edge of Elias's map. "But he can't tax a line of code. Tell Hamo to double the size of the lead molds for tomorrow's pour. We're going to cast the sleeves twelve inches long, Elias. If the Baron wants to count our wagons at the crossroads, we'll give him something else to look at—we'll show him what the river looks like when it runs through a lead valve."