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.

Magnet lines, 22, 23.

Magnet, permanent, 25, 38, 46, 50, 172.

Magnet, reversed, 20.

Magnet, steel, 53.

Magnet, swinging, 53.

Magnetic, 7, 19, 20, 21, 22, 25, 113, 178.

Magnetic construction, 39.

Magnetic exterior, 27.

Magnetic field, 22, 24, 27, 38, 50, 112, 146, 148, 155.

Magnetic interior, 23.

Magnetic pull, 59.

Magnetic radiator, 37.

Magnetism, 19, 54, 104, 110, 159, 171.

Magnetized, 18, 25, 27, 50.

Magnetized wire, 146.

Magnets, 13, 14, 18, 19, 20, 21, 22, 23, 24,