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Keywords: Life in Motion Fig 30.png en Fig 30 ”Diagram showing the break in the railway myograph Current enters at d passes along arm of brass a having a bit of platinum at b thence through point of screw c to e and back to battery by g When the plate of the railway runs across it knocks a aside and opens current at b Life in Motion or Muscle and Nervehttps //archive org/details/b21929786 John Gray McKendrick 1892 1926 Life in Motion book |