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| Keywords: Life in Motion Fig 19.png en Fig 19 ”Induction coil of du Bois Reymond a primary coil; b secondary coil; c bunch of wires in centre of primary coil for increasing intensity of induction currents; d binding screw for attachment of wire from galvanic element The current passes up the pillar d along steel spring to e thence to the screw the point of which touches the back of the spring at e; from f through wire of primary coil to i round the two pillars of soft iron i which it renders magnetic and thus draws down the head of the spring k; this interrupts the current at e thus breaking the contact of the spring at the screw point When the current is thus interrupted the spring flies up by its elasticity and again establishes the circuit at e This interruption was originally invented by P Wagner Life in Motion or Muscle and Nervehttps //archive org/details/b21929786 John Gray McKendrick 1892 1926 Life in Motion book Electric switches | ||||
