• 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, 25, 39, 51, 53, 54, 70, 71, 73, 75, 81, 90, 93, 112, 113, 115, 147, 150, 163, 176, 177, 178.
• Main conductor, 31.
• Mandrel, 15, 16.
• Manganese, 19.
• Manifestations, 19.
• Mariner, 172.
• Material, non-conducting, 90.
• Maximum, 154.
• Measure, 55, 56, 60, 62.
• Measurement, 62.

• Measuring devices, 27.
• Measuring instruments, 8.
• Mechanism, 47, 180.
• Medical batteries, 99.
• Mercury, 63, 169.
• Metal base, 73.
• Mica, 186.
• Microphone, 118, 119, 120.
• Millimeter, 63.
• Minus, 34.
• Minus sign, 21.
• Morse code, 76.
• Motor, 7, 21, 27, 46, 47, 62, 82, 99, 150, 176, 180.
• Mouthpiece, 115.
• Mouthpiece rays, 188.
• Moving field, 117.
• Multiple, 168.
• Musical scale, 111.

N

• Negative, 21, 35, 36, 68, 83, 86, 87, 94, 125, 151, 152, 154, 165, 177, 178, 179.
• Neutral, 125.
• Neutral plate, 84.
• Nickel, 136.
• Nickel plating, 132.
• Nitrate of silver, 62.
• Nitrogen, 126.

• Non-conducting material, 90.
• Non-conductor, 164.
• Non-magnetic, 19.
• North pole, 20, 21, 22, 23, 25, 50, 54, 156.
• Number plate, 75.
• N-ray, 188.

O

• Ohms, 60, 63.
• Ohms, international, 63.
• Ohms law, 7.
• Operator, 95, 118.
• Oscillating, 99, 105.
• Osmium, 169.
• Oxides, 125.
• Oxidizing, 183.
• Oxygen, 35, 123, 125, 126, 128, 129, 169.

P

• Packing ring, 124.
• Paraffine, 56, 100, 101, 102.
• Paraffine wax, 86.
• Parallel, 87, 88, 89.
• Parallel switch bar, 67.
• Parallel wires, 28, 49.
• Partition, 124.
• Peon, 13.

• Percolate, 128.
• Periodicity, 159.
• Periods of alternations, 149.
• Permanent, 18, 19, 50.
• Permanent magnet, 25, 38, 46, 50, 172.
• Phase, 19.
• Phenomenon, 27, 65.
• Photograph, 186.
• Physical, 21.
• Pile, voltaic, 33.
• Pipe, 61.
• Pitchblende, 186.
• Pivot pin, 53.
• Pivotal, 22.
• Plane, 13.
• Plate, 57, 93.
• Plate, contact, 67, 68, 79.
• Plate, copper, 33, 35, 58, 67.
• Plate, negative, 84.
• Plate, number, 75.
• Plate, positive, 84, 88.
• Plate, zinc, 33.
• Platinum, 13, 57, 137.
• Pliers, 14.
• Plus sign, 21, 24.
• Pointer, 53.
• Polarity, 154, 177, 178, 179.
• Polarization, 35.
• Pole, north, 20, 21, 22, 23, 25, 50, 54, 156.

• Pole piece, 40, 42.
• Pole, south, 20, 21, 22, 25, 50, 54, 156.
• Poles, 177, 179.
• Polonium, 186.
• Porcelain, 86.
• Porous, 85.
• Positive, 4, 21, 25, 36, 40, 68, 83, 86, 87, 94, 123, 125, 151, 152, 153, 155, 165.
• Post, binding, 52, 71.
• Potentiality, 105, 109.
• Power, 38, 186.
• Power, candle, 89, 139.
• Precipitate of lead, 83, 85.
• Precision, 7.
• Pressure, 87.
• Primary, 35, 62, 98, 134, 142, 159, 184.
• Primary battery, 7, 99.
• Primary circuit, 99.
• Primary coil, 106, 109.
• Prime conductor, 6.
• Projected, 185.
• Propagated, 105, 185.
• Properties, 55.
• Purification, 123, 128.
• Purifier, 126, 131.
• Push button, 65, 68, 69, 70, 76, 79.

Q

• Quantity, 55, 60, 61, 138.
• Quartz, 186.

R

• Radio-activity, 186.
• Radium, 184, 185, 187, 188.
• Ratchet drill, 13.
• Reaction, 148.
• Receiver, 12, 90, 97, 121, 122.
• Receiving station, 109.
• Rectangular, 69.
• Rectifiers, 146.
• Red lead, 83, 84.
• Reel, 13.
• Reflected, 185.
• Refraction, 185.
• Refractory, 182.
• Register, 57.
• Removable, 54.
• Removable cap, 73.
• Repel, 20.
• Repulsion, 21, 128.
• Reservoir, 61, 62.
• Resiliency, 99.
• Resistance, 7, 36, 37, 60, 63, 99, 135, 136, 137, 138, 140, 141, 156, 157, 163, 166, 168.
• Resistance bridge, 7.
• Resistance, external, 37.
• Resistance, internal, 37.
• Rheostat, 7.
• Reversed, 20, 50, 153.

• Reversible, 163.
• Reversing, 176.
• Reversing switch, 67.
• Revolubly, 46.
• Revolve, 179.
• Revolving, 177.
• Roentgen rays, 184.
• Roentgen tube, 187.
• Rotation, 149.
• Rubber, 40, 46, 77, 115, 126, 130, 138.

S

• Sad-irons, 13.
• Saline, 133.
• Sanitation, 12.
• Saturated, 85.
• Screw, 15.
• Screw, binding, 65, 66.
• Screw-driver, 14.
• Screw, set, 72.
• Sealing wax, 53.
• Secondary, 62, 98, 105, 158, 159, 160.
• Secondary circuit, 99.
• Secondary coil, 107, 108.
• Self-induction, 149, 156.
• Sender, 90, 97.
• Sending apparatus, 106.
• Sending key, 90.
• Separately excited, 46.

• Series-wound, 47.
• Severed magnet, 20.
• Sewage, 12.
• Shaft, 30.
• Shears, 14, 17.
• Shellac, 40.
• Shunt-wound, 47.
• Signal, 118.
• Silver, 19, 63, 125.
• Silver nitrate, 62.
• Socket, 54, 139.
• Soldering, 14.
• Soldering iron, 17.
• Solution, 55, 57, 62, 63, 84, 86, 133, 134, 142.
• Sounder, 90, 92, 95, 96.
• Sounding board, 119.
• Source, charging, 83.
• South pole, 20, 21, 22, 25, 50, 54, 156.
• Spark gap, 102, 106.
• Spark jump, 99.
• Spring finger, 69.
• Square, 14, 17.
• Standard, 62, 63.
• Station, 94, 95, 117, 122.
• Steel, 18, 19.
• Steel magnet, 53.
• Sterilized, 12.
• Stirrup, 75.
• Stock bit, 13.