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Watch Math Quiz
  HOW'S YOUR WATCHMAKING MATH? - Each one of the figures and formulas below has some meaning in watchmaking.  Do you know what it is?   1.  25.4mm  2.  .0888  3.  (Teeth of center wheel / third pinion) X (third wheel teeth / fourth pinion) = 60   5.  Diameter X 3.14159  6.  (Cannon pinion leaves / minute wheel teeth) X (minute wheel pinion / hour wheel teeth) = 1/12  7. 2 to 2.5 X diameter  
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