Keywords: Life in Motion Fig 53.png en Fig 53 ”Diagram showing the arrangement of the apparatus in demonstrating by curare the inherent irritability of muscle b galvanic element; p primary and s secondary coil of induction machine; k key for admitting shocks either to nerves or muscles; k ˛ double key for sending shocks either to the two muscles m and m ˛ or to the two nerves n and n ˛; t t ˛ telegraph signals The arrows show the direction of the currents Life in Motion or Muscle and Nervehttps //archive org/details/b21929786 John Gray McKendrick 1892 1926 Life in Motion book Electrical measurement instruments |