The twelve-pound six-sided lead sinker did not fall in silence.
It dropped through forty feet of empty air. Then, the six fluted facets of the heavy weight caught the draft from the southern air-flow chimney pipes, producing a low, rhythmic whirr like the wing-beat of a diving cormorant. The sound was subtle, almost musical, cutting through the heavy clockwork din of the coal-fired donkey-engine below.
The star-thread cord trailed behind it—a glinting, silver filament that unspooled from Qiao Ming’s calloused left hand with easy fluidity. The land-mapper did not merely drop the plumb. He cast it with the subtle, spinning flick of the wrist that deep-sea sounders use to pitch a lead into the teeth of an oncoming breaker. His bare feet gripped the damp pale limestone doorstep of the viewing gallery, his shoulders acting as a living gimbal that compensated for the weight’s swinging weight swing.
The lead weight struck the main guy-wire of the timber gallows-frame with pinpoint, razor-sharp care.
It wasn’t the mass of the plumb alone that did the work. It was the speed, combined with the extreme knife-edge hardness of the star-thread cord wrapped around the lead’s six-sided shoulder. At the instant of impact, Qiao Ming jerked the standing part of the star-thread with the full weight of his shoulder, drawing the razor-thin wire across the hempen fibers under eight thousand pounds of tension.
