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Electricity for Boys

Chapter 39: P

By James Slough Zerbe

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About This Book

A practical manual aimed at young readers that explains electrical principles and hands-on construction of apparatus. It opens with a brief historical overview, then recommends workshop layout, tools, and safety precautions before guiding readers through building magnets, coils, armatures, batteries, and simple dynamos. It presents methods for detecting and measuring current, explains units such as volts, amperes, ohms, and watts, and describes common experiments and construction techniques with many illustrations. Emphasis is on progressive, step-by-step instruction to develop practical understanding, while warning that some demonstrations can be hazardous.

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.