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68. Telegraph sounder 92 69. A telegraph circuit 94 70. Induction coil and circuit 99 71. Illustrating elasticity 100 72. Condenser 101 73. High-tension circuit 102 74. Current interrupter 103 75. Wireless-telegraphy coherer 105 76. Wireless sending-apparatus 107 77. Wireless receiving-apparatus 108 78. Acoustic telephone 111 79. Illustrating vibrations 111 80. The magnetic field 112 81. Section of telephone receiver 114 82. The magnet and receiver head 115 83. Simple telephone connection 116 84. Telephone stations in circuit 117 85. Illustrating light contact points 118 86. The microphone 119 87. The transmitter 119 88. Complete telephone circuit 121 89. Device for making hydrogen and oxygen 124 90. Electric-water purifier 127 91. Portable electric purifier 129p. x 92. Section of positive plate 130 93. Section of negative plate 130 94. Positive and negative in position 130 95. Form of the insulator 130 96. Simple electric heater 137 97. Side view of resistance device 139 98. Top view of resistance device 139 99.