• 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.
• Filament, 168, 169, 170.
• Filter, 128.
• Flat iron, 140.
• Flocculent, 128.
• Force, 50.
• Formulated, 19.

• Friction, 32.
• Frictional, 6, 7, 29.
• Fuse, 169.

G

• Galvani, 7.
• Galvanic, 7, 23, 30.
• Galvanometer, 7, 49, 108, 143.
• Galvanoscope, 55, 58, 59.
• Gaseous, 128.
• Gasoline, 99.
• Gas stove, 17.
• Gelatine, 128.
• Generate, 29, 38, 134, 136, 145.
• Generated, 55.
• Generating, 32, 134.
• Generation, 170.
• Generator, 32, 125, 147.
• German silver, 136, 137.
• Germicide, 187.
• Gimlets, 17.
• Glass, 30, 86, 126, 186.
• Gold, 135.
• Grid, 84.
• Ground circuit, 121.
• Gunpowder, 6.

H

• Hack-saw, 14.
• Hammer, 13.

• Heart-shaped switch, 77.
• Heater, 136.
• Heating, 13, 38.
• Hertzian rays, 170.
• Hertzian wave, 184.
• High tension, 38, 102, 184.
• High tension apparatus, 98.
• High tension coils, 103.
• High voltage, 158.
• Horizontal bar, 46.
• Horseshoe magnet, 22, 24, 175.
• Hydrate of aluminum, 129.
• Hydrogen, 35, 123, 125, 128.

I

• Igniting, 99.
• Illumination, 162, 163, 165, 167, 170.
• Immersed, 133.
• Impulses, 60, 62, 96, 104, 109, 152, 179.
• Incandescent, 166, 168.
• Induced, 28.
• Inductance, 149, 150.
• Induction, 27, 37, 98, 147.
• Induction coils, 99, 102, 106.
• Influences, 178.
• Initial charge, 88.

• Insulated, 27, 28, 40, 43, 52, 55, 73, 115, 151, 180.
• Insulating, 66, 69, 120, 140, 164.
• Insulating material, 114.
• Insulation, 40, 116.
• Instruments, 49, 94, 112, 118, 120.
• Instruments, measuring, 8.
• Intensity, 55, 60, 104, 154.
• Interior, magnetic, 23.
• Internal resistance, 37.
• Interruption, 102, 103.
• Installation, 168.
• Ionize, 186.
• Iron, 19, 132, 133, 136, 142, 171.
• Isolated, 186.

J

• Jar, 29, 31, 32.
• Journal, 46.
• Journal block, 16, 146.
• Jump spark, 99.

K

• Key, 90, 91, 95.
• Key, sending, 90.
• Knob, 32.
• Knob, terminal, 31.

L

• Laboratory, 9.
• Lead, 31, 136.
• Lead, precipitated, 83, 85.
• Lead, red, 83, 84.
• Lever switching, 67.
• Light, 104.
• Light method, 56.
• Lighting, 9, 38.
• Lighting circuit, 48.
• Lighting system, 82.
• Lightning, 6, 171, 172, 173.
• Lightning rod, 173.
• Lime, chloride of, 84.
• Line of force, 146.
• Line wire, 122.
• Line, magnetic, 22, 23.
• Liquid, 32.
• Litharge, 83.
• Loadstone, 17.
• Locomotives, 165.
• Low tension, 38, 98, 102, 179.

M

• Magnet bar, 20.
• Magnet core, 16, 75, 93.
• Magnet, electro, 59, 78.
• Magnet, horseshoe, 22, 25, 175.