Current testing, 143. Cut-out, 120. Cutter, 14. Cutting, lines of force, 38. Cylinder, 44. Cylindrical, 43. D Dash, 95, 97. Decoherer, 106, 108. Decomposed, 57, 128. Decomposes, 55. Decomposing, 123. Decomposition, 12, 35, 82. Deflected, 54. Degree, 135, 162. Demagnetized, 24, 72. Deposited, 58, 133. Depression, 15, 140. Detecting current, 49. Detector, 49, 52, 54, 105. Devices, measuring, 27. Diagrams, 46, 48, 79, 89. Diagrammatically, 81. Diamagnetic, 19. Diametrically, 114. Diaphragm, 112, 113, 116, 120, 122. Diamonds, 186. Diluted, 86. Direct current, 38, 140. Direction of current, 50. Direction of flow, 98. Discharge, 172. Disintegrate, 132. Disk, 43. Dissimilar, 37. Disturbance, 176. Dividers, 14. Divisibility, 168. Dot, 96, 97. Dot and dash, 96. Double click, 95. Double line, 65. Double-pole switch, 65. Double-throw switch, 117. Drawing, 20. Drill, ratchet, 13. Drops, 81. Ductile, 186. Duplex wire, 115. Dynamo, 7, 27, 38, 42, 46, 48, 62, 82, 83, 87, 89, 132, 141, 142, 145, 150, 155, 161, 165, 167, 175, 176, 180, 187. Dynamo fields, 40, 41. E Earth, 22. Elasticity, 100, 142. Electric, 6, 31, 49, 50, 76, 78, 81, 131, 142, 158, 162, 173, 176. Electric arc, 63, 163. Electric bell, 19, 69, 70, 71, 72, 106, 117. Electric bulbs, 167. Electric circuit, 118. Electric fan, 55. Electric field, 76. Electric hand purifier, 129. Electric heating, 135, 137, 161. Electric iron, 130, 141. Electric lamp socket, 139. Electric light, 56, 66. Electric lighting, 161. Electric power, 113. Electric welding, 183. Electrical, 8, 11, 65, 96, 98, 104, 141, 159, 180, 184, 187. Electrical impulses, 105, 147, 148. Electrical manifestations, 175. Electrically, 32, 70. Electricity, 5, 6, 7, 8, 9, 12, 13, 18, 21, 26, 27, 28, 29, 38, 49, 54, 60, 61, 62, 82, 97, 98, 100, 104, 110, 112, 116, 123, 124, 133, 134, 136, 138, 145, 146, 147, 154, 156, 160, 166, 170, 171, 172, 175, 182, 187. Electricity measuring, 49. Electricity, thermo-, 142. Electrified, 37, 186. Electro-chemical, 55. Electrode, 35, 124, 127, 128, 161, 162, 163, 164, 165, 184. Electrolysis, 7, 123, 126, 132. Electrolyte, 33, 35, 36, 57, 86, 88, 123, 132, 142. Electrolytic, 55, 123, 125. Electro-magnet, 59, 78. Electro-magnetic, 7, 24, 25, 29, 37, 55, 92, 93, 94. Electro-magnetic force, 7. Electro-magnetic rotation, 7. Electro-magnetic switch, 116. Electro-meter, 7. Electro-motive force, 37, 63, 99. Electroplate, 12, 38, 48, 123, 132, 134. Electro-positive-negative, 142, 143. Elements, 36, 83. Engine energy, 170, 180. Equidistant, 127. Ether, 104. Example, 61. Excited, 47. Extension plate, 103. Exterior, 3. Exterior magnetic, 27. External, 37. External circuit, 153. External current, 50. External resistance, 37. F Factor, 61. Ferrous oxide, 125. Field, 46, 47. Field, dynamo, 40, 41. Field magnet cores, 155. Field, magnetic, 38. Field of force, 33. Field wire, 48.