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 "captions": [
  {
   "at": 0.0,
   "text": "Identical rods stand in a column, held by spring catches. The next one waits under it, on two cams."
  },
  {
   "at": 0.4,
   "text": "On cue, the cams turn once and push the waiting rod up into the column, lifting every rod above it."
  },
  {
   "at": 0.63,
   "text": "The top rod rises past the front lip and rolls off down a short ramp."
  },
  {
   "at": 1.02,
   "text": "It falls freely, 40 cm in 0.29 s, the same every time."
  },
  {
   "at": 1.26,
   "text": "It lands on the lever's long arm, and the short arm throws the mallet up into the drum."
  },
  {
   "at": 1.39,
   "text": "The tipped arm rolls the rod onto the intake rails, and a spring sets the lever back."
  },
  {
   "at": 1.46,
   "text": "The rod rolls back under the column and waits on the cams, the next to be pushed in."
  }
 ]
}