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Watch Math Quiz
  WATCH MATH QUIZ ANSWERS - 1.  25.4mm = one inch.  2.  .0888 inch = 1 ligne.  3.  18,000 vibratiopns per hour / 60 = 300 vibrations per minute.  300 vibrations per minute / 30 (number of vibrations to turn a 15 tooth escape wheel) = 10 (number of times escape wheel turns in a minute).  4.  Gear ration of center wheel to fourth wheel in a watch with second hand on fourth wheel.  5.  Circumference of a circle.  6.  Gear ratio between cannon pinion and hour wheel.  7.  Approximate ratio of length of balance pivot to its diameter.   
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