Battery charging, 82. Bearings, 45, 46. Bells, 65, 73, 76, 122. Bells, electric, 70. Bench, 13, 15, 17. Binding post, 52, 70, 71, 72, 103, 107, 108, 121. Binding screw, 65, 66. Bismuth, 18, 143. Bit, 13. Blue vitriol, 57. Brass plate, 77, 78. Brazing, 17, 65. Bridge, 52. Brush holder, 46. Brushes, 48, 150, 151, 153, 167. Burglar, 11. Burglar alarm, 76, 80. Buttons, contact, 80. Buttons, push, 65, 68, 69, 70, 76, 79. C Calorimeter, 56. Cancerous, 187. Candle power, 89, 139. Cap, removable, 73. Cap screws, 42. Carbon, 35, 119, 121, 162, 163, 169. Carbon block, 120. Carbon pencil, 119. Cathode, 35, 36, 133, 134. Cell, 29, 33. Cell, accumulator, 87. Cell, charging, 87. Channel, 43. Channel, concave, 40. Charged, 120. Charged battery, 82. Charging circuit, 82, 89. Charging source, 83. Charged wire, 147. Chemical, 57. Chisels, 13. Chloride of lime, 84. Choked, 157. Choking coils, 145, 146, 156, 158. Circuit, 33, 69, 73, 76, 78, 80, 81, 90, 92, 93, 109, 113, 116, 121, 122, 131, 134, 143, 156. Circuit, primary, 99. Circuit, secondary, 99. Circuiting, 81, 155. Circuiting system, 79. Clapper arm, 70. Closed rings, 26. Coherer, 105, 108, 109. Cohering, 106. Coils, 18, 26, 52, 55, 74, 160. Coils, choking, 145, 146, 156, 158. Coils, induction, 99, 102. Coils, primary, 109. Coils, secondary, 102, 109. Coincide, 42. Cold, 14. Collecting surfaces, 30. Collector, 31. Column, 61. Combustion, 169. Commutator, 44, 46, 151, 152. Commutator brushes, 46. Commutator plates, 45. Compass, 22, 24, 172. Composition, 83, 124. Compound wound, 47. Concave channel, 40. Condenser, 98, 100, 101, 102, 108. Conduct, 6, 108. Conduction, 135, 136, 138, 166, 170. Conduction current, 27. Conductor, 21, 31, 33, 63, 98, 116, 161, 162. Conduit, 72. Conically formed, 126. Conjunction, 143. Connecting wire, 58. Connection, 72, 76. Construction, magnet, 39. Consumption, 180. Contact, 122, 123, 152, 162. Contact finger, 150. Contact plate, 67, 68, 79. Contact screws, 93. Contact surface, 66. Continuous, 145. Converter, 176. Converting, 142, 145, 146. Copper, 18, 34, 36, 65, 66, 132, 133, 134, 135, 136, 137, 142, 143. Copper cyanide, 133. Copper plate, 33, 35, 58, 67. Copper sulphate, 57. Copper voltameter, 55, 57. Core, 27, 28, 36, 39, 40, 115. Core, magnet, 75, 93. Counter, clock-wise, 51. Coupled, 36. Crank, 30. Crookes' tube, 184. Cross bar, 52, 66. Crown of cups, 32. Crystal, 85. Current, 6, 7, 13, 18, 26, 27, 28, 35, 36, 37, 38, 47, 50, 51, 52, 55, 56, 57, 58, 59, 62, 63, 70, 72, 73, 90, 95, 98, 105, 108, 116, 133, 134, 135, 136, 138, 139, 140, 141, 142, 143, 147, 148, 149, 150, 152, 153, 157, 160, 161, 163, 165, 166, 170. Current, alternating, 150. Current changing, 82. Current conduction, 27. Current, continuous, 164. Current, direct, 145, 150. Current direction, 50. Current, exterior, 50, 150. Current, reversing, 148. Current strength, 7, 57.