# Interval
The ratchet was slipping.
Maren heard it before she saw it — a faint tick in the wrong place, an extra beat between the pawl’s catches. The clockwork that rotated the lens had kept its rhythm for decades, fourteen seconds per revolution, throwing the beam three times a minute across twenty miles of dark water. Now there was a stutter in the mechanism, a hesitation she could feel through the floorboards of the lamp room.
She climbed the iron stairs in the pre-dawn dark, her hand trailing the cold railing, counting the steps by feel. One hundred seventeen. At the top, the lamp room wrapped her in glass — the Fresnel lens standing taller than she was, its concentric rings of crystal focusing the light into a blade that swept the horizon. During the day, the lens threw rainbows across the walls. At night, it threw warnings.
She stood and timed it. Counted heartbeats — her own clock, the one she’d carried since her father taught her the rhythm standing on this same gallery, her head level with his hip. One-thousand-one. One-thousand-two. She counted to fourteen. The beam had not come around.
One-thousand-fifteen. There.
One second slow. Enough for no ship to notice tonight. But drift compounds. A second becomes two, becomes five, becomes a light that answers to the wrong name. Every lighthouse spoke its own language — three flashes in twelve seconds, or two in fifteen, or one long sweep every twenty. The pattern was the lighthouse. Change the rhythm, change the identity.
She opened the clockwork housing. A weight on a cable, wrapped around a drum, driving a gear train that rotated the lens carriage. As the weight descended, the drum turned, the gears stepped, the lens swept. Every four hours, she cranked the weight back to the top.
The pawl was worn. She could see the rounded edge where decades of metal on metal had smoothed the tooth that should have been sharp. Each time the ratchet wheel advanced, the pawl slipped back a fraction before catching. A fraction multiplied through the gear train, stretched across the revolution.
She could file a new edge in the morning, when she had daylight and steady hands. The light still needed to keep its rhythm.
Maren disconnected the drive train. The clockwork stopped. The lens, massive in its ring of mercury, drifted to a halt.
Darkness. The beam stopped sweeping. Out past the glass, the sea went unspoken to.
She put her hands on the lens carriage — the brass frame that held the crystal assembly — and pushed. On its mercury float, the lens moved like a door on oiled hinges, all that glass and metal turning under her palms. She pushed it through one revolution. The beam swept out, caught the swell, kept going, returned to her.
She counted. Pushed again.
Her father had done this twice in forty years. Both times in storms, when the clockwork flooded. He’d told her it was the worst part of the job — not because the lens was heavy on its float, but because you could not stop. Once you took over, you were the mechanism. Every fourteen seconds, your hands had to deliver the beam. Your body became the interval.
She found her rhythm in the first few minutes and it was not fourteen seconds. It was something close — thirteen and a half, or fourteen and a quarter, she could not tell exactly. She only knew the gap between her pushes had a shape the clockwork’s did not. The mechanism delivered its revolutions identically, each one a copy of the last. Her revolutions breathed. Slightly longer when she inhaled. Slightly shorter when she shifted her weight against the frame.
No sailor on the water would notice. A half-second variation was smaller than the uncertainty of timing a distant flash against a ship’s chronometer. The pattern was still three sweeps per minute, still the same three-flash character that identified this point of rock on every chart from here to Halifax.
But it was not the same.
She pushed the lens for two hours. Her palms grew warm against the brass. She fell into it the way she fell into walking — a rhythm below thought, where the body knows the tempo and the mind goes elsewhere. The beam swept and swept. She watched the dark between sweeps. It had a color she had never noticed from outside: a deep violet, almost warm, the afterimage of the beam lingering in the glass. The dark was not the absence of the light. It was the space the light made by leaving.
The sky grayed. She clamped the carriage and turned off the lamp. In the daylight she filed the pawl, testing the edge with her thumb until the tooth caught clean. She re-cut the engagement angle, reassembled the housing, wound the weight.
At dusk she lit the lamp and released the clockwork.
The mechanism took the lens from her hands. The first revolution was the same as every revolution would be — fourteen seconds, the pawl catching sharp, the gear train stepping without hesitation. The beam swept out across the water. Returned. Swept out.
Maren stood in the gallery and watched it go.
The dark between flashes settled over her like the air between heartbeats — charged with what had just passed and what was about to come. She had spent the night inside that dark, her hands on the frame, her breath in the interval. Now the interval belonged to the clockwork again, and she stood in it as a visitor.
She closed the gallery door and descended the stairs. One hundred seventeen steps. Her hand on the railing, her feet finding each tread without looking. Halfway down, the beam crossed the stairwell window — a blade of light that swung across the stone wall and vanished.
She kept walking. Fourteen seconds later, it came again.