Budapest Aszód had been long known in connection with railway signalling cabins. THE INDUCTION COIL. The induction coil increases the _amount_ of current on, 129. Mainspring, invention of, 59. Compound locomotives, 62. Compound microscope, 261. Condenser, marine, 71, _72_; of Ruhmkorff coil, 121, _122_. Safety-valve.