Clockmaker's notebook · p. 31

The drive wheel turns once every six hours. The minute hand must turn once every hour: you need to multiply the speed by six.

Center distances (in teeth)
I–II 64 · II–III 70 · III–IV 60 · IV–V 48
Two wheels mesh if the sum of their teeth equals the center distance.

Wheels II and III are doubled: the small one receives and the large one delivers, and they turn together. The wheel on shaft IV is an idler: it transmits, but doesn't change the speed.

Workshop wheels

Meshes

Fit all five wheels and pull the lever.
Town hall · clock tower · machine room
THE GEAR TRAIN
00:000 of 5 wheels fitted

Council record — the clock has stood still since the flood

CLOCK TOWER

The water carried off the middle wheels and the clockmaker died in March. What remains is his notebook, five empty shafts, and a drawer of loose wheels. Two wheels mesh if the sum of their teeth matches the distance between their shafts: that decides which ones fit. What decides whether the clock keeps correct time is something else.

The clock strikes again

SIX TO ONE

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