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World 3 · Gear Trains: Counting Time · 14 min · PRO

Designing a train

Choosing tooth numbers

PRO · Clockwork & Time

World 3: Gear Trains: Counting Time is part of PRO

The first world of Clockwork & Time is free. PRO opens the other 24 lessons in 6 worlds — simulations, quizzes and all.

  • Ratios from tick to hand
  • Mainspring, barrel and power reserve
  • Winding, setting and the date window
  • Date and day-date
  • Annual and perpetual calendars
PRO includes
  • All 60 labs — every world, every lesson
  • Practice exams and certificates

$8.33/mo, billed yearly ($99.99) · or $39.99 monthly

Unlock Clockwork & TimeTry the free world
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← Ratios from tick to handMainspring, barrel and power reserve →

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