I. SOUND
§ 1. Oscillatory Motion. General ............... 3
§ 2. Transformation of Energy during Oscillatory Motion. Damping of Oscillations................... 5
§ 3. Oscillations of Sounding Bodies.............. 7
§ 4. Sound Pitch....................... 8
§ 5. Loudness of Sound.................... 11
§ 6. Propagation of Sound................... —
§ 7. Sound Waves. The Velocity of Sound ........... 13
§ 8. Reflection of Sound. Echo................. 16
§ 9. Sound Resonance..................... 17
§ 10. Sound Recording and Reproduction............. 19
II. LIGHT
§ 11. Light Sources...................... 21
§ 12. Rectilinear Propagation of Light.............. 22
§ 13. Eclipses of the Sun and the Moon............. 25
§ 14. The Velocity of Light.................. 26
§ 15. Light Ray. Light Beams................. 29
§ 16. Light Reflection. Laws of Reflection............ 31
§ 17. Mirrored and Diffused Reflection.............. 33
§ 18. The Plane Mirror and Its Applications........... 34
§ 19. Laboratory Work No. 1. Studying Light Reflection from a
Plane Mirror...................... 37
§ 20. The Concave Spherical Mirror .............. 39
§ 21. Images of Objects in Concave Mirrors........... 41
§ 22. Application of Concave Mirrors.............. 43
§ 23. Light Refraction..................... 45
§ 24. Refraction through Slabs with Parallel Faces and- through a
Prism ......................... 47
§ 25. Laboratory Work No. 2. Observing Refraction through a Slab
with Parallel Faces and through a Prism ......... 49
§ 26. Lenses......................... —
§ 27. Object Images in Lenses................. 52
§ 28. Laboratory;Work No. 3. Obtaining Images with the Help of .
Lenses......................... 55
§ 29. The Photographic Camera ................ 56
§ 30. Projector........................ 57
§ 31. The Eye and Vision................... 58
§ 32. Defects of Eye-Sight and Its Hygiene ........... 60
f.
•
§ 34. Spectra and Colour................... —a
§ 35. Colour of Bodies..................... 65 i?
III. ELECTRICAL PHENOMENA |
Chapter One — Electricity. General Jj
§ 36. Electricity in Everyday Life ............... 67
§ 37. Electrification of Bodies by Friction............ 68 i
§ 38. Interaction of Charged Bodies..............: 69 ."'•
§ 39. Transfer of a Charge upon Contact ............ 71
§ 40. The Electroscope .................... 72 ;
§ 41. An Electric Field .................... 74
§ 42. Conductors and Insulators of Electricity.......... 75 •
§ 43. Earthing ........................ 77
§ 44. Protons and Electrons.................. 78
§ 45. The Role of Electrons in ths Electrification of Bodies .... 79
§ 46. Electrification of Bodies by Induction ........... 80 •
§ 47. The Electric Current................... 83
§ 48. Cells.......................... 84
. § 49. The Storage Batteries .................. 87
§ 50. Currents and Their Effects................ 88
§ 51. The Unit of Current................... 91-
§ 52. Electrical Phenomena in Atmosphere............ 93
§ 53. Lightning Protection................... 94
Chapter Two. Electric Current, Resistance and Potential
§ 54. Electric Circuit and Its Components............ 96
§ 55. The Direction of Current................. 99^
§ 56. The Magnitude of Current................ '—Ч
§ 57. The Unit ot Current................... 100
§ 58. The Ammeter...................... 101
§ 59. Assembling an Electric Circuit and Measuring the Current :,
in Its Various Parts................... 103.
§ 60. Resistance of Conductors................. 104«;
§ 61. The Unit of Resistivity. Calculating Resistivity of Conductors 105
§ 62. Rheostats........................ 108
§ 63. Potential........................ HO
§ 64. The Unit of Potential .................. Ill
§ 65. The Voltmeter ..................... 112
§ 66. Laboratory Work No. 5. Measuring Voltage across Various
Parts of the Circuit................... 1И
§ 67. The Relation between Current, Voltage and Resistance.
Ohm's Law....................... —*
§ 68. Laboratory Work No. 6. Finding the Resistance of a Wire
with the Help of an Ammeter and Volmeter........ 117
§ 69. Conductors in Series................... 118
§ 70. Laboratory Work No. 7. Studying the Connection of Condu- '
ctors in Series ..................... 120'
§ 71. Parallel Connection of Conductors............. 121;
§ 72. Resistances in Parallel.................. 122|
§ 73. Laboratory Work No 8. Studying Parallel Connection of .y
Conductors....................... 1Щ
-:(И
' § 74. Work Done by Electric Current............. 126
§ 75. Power of Electric Current................ 127
§ 76. Another Way of Calculating the Work of a Current .... 128
§ 77. Electric Meter..................... 129
§ 78. Laboratory Work No. 9. Finding Power of the Current
Consumed by an Electric Lamp ............. 131
§ 79. Heating of Conductors by Electric Current ........ —
§ 80. Joule's and Lenz's Law................. 132
§ 81. Electrical Heating Appliances .............. 134
§ 82. Laboratory Work No. 10. Determining the Joule (Calory
Ratio)......................... 137
§ 83. The Incandescent Lamp................. 138
§ 84. Laboratory Work No. 11. Finding Thermal Efficiency of an
Electric Heater..................... 141
§ 85. Electric Fuses ..................... —
Chapter Three. Electromagnetic Phenomena
§ 86. Magnetic Phenomena. Magnetising by Currents....... 145
§ 87. Magnets........................ 147
§ 88. Magnetic Needle. Interaction of Magnets ......... 148
§ 89. The Magnetic Field................... 149
§ 90. Magnetising by Induction ................ 150
§ 91. Lines of Force of the Magnetic Field........... 151
§ 92. The Compass. The Magnetic Field of the Earth...... 153
§ 93. Laboratory Work No. 12. Studying the Properties of a Magnet and Obtaining Magnetic Spectra........... 155
§ 94. The Action of Current on a Magnetised Needle...... 156
* 95. The Magnetic Field of a Solenoid............. 157
§ 96. The Electromagnet.........•......... 158
§ 97. Laboratory Work No. 13. Assembling and Testing an Electromagnet ....................... 161
§ 98. The Electric Door-bell ................. —
§ 99. The Electric Telegraph................. 163
§ 100. The Electromagnetic Relay ............... 165
§ 101. Remote Control .................... 167
§ 102. The Telephone..................... 168
§ 103. Telephone Exchange Stations............... 170
§ 104. Laboratory Work No. 14. Assembling and Testing an Electromagnetic Relay ................... 171
§ Ю5. A Current-bearing Conductor in the Magnetic Field .... 172
§ 106. D. C. Electric Motor.................. 173
§ 107. Laboratory Work No. 15. Assembling and Testing a D. C.
Electric Motor..................... 177
§ 108. Electric Motors and Their Use.............. —
§ 109. Induced Current.................... 179
§ 110. A. C. Generators . .................... 182
§ 111. Reversibility of D. C. Machines............. 185
§ 112. Properties of Alternating Current and Its Application .... 186
§ 113. The Transformer. Variation of A. C. Voltage....... 187
§ 114. Change of Current during Transformation......... 191
227
§ 115. Transformers Used in Long-distance Power Transmission . . 192
§ 116. Path of Current from Power-station to Consumers..... 195
§ 117. Electrification Progress in the U. S. S. R.......... —
IV. RADIO RECEPTION. GENERAL
§ 118. What is Radio?..................... 199
§ 119. From the History of Radio Invention........... —
§ 120. High-frequency Current................. 200
§ 121. The Capacitor ..................... 201
§ 122. The Oscillatory Circuit................. 203
§ 123. Radio Transmission. General............... 205
§ 124. Crystal Radio Set.................... 206
§ 125. Laboratory Work No. 16. Assembling a Crystal Set arid
Obtaining Reception................... 209
§ 126. Progress in Radio Engineering.............. 210
V. ATOMIC STRUCTURE
§ 127. General........................ 213
§ 128. Natural Radioactivity................ ... 214
§ 129. Nuclear Structure ...................217
§ 130. Nuclear Energy..................... 219
§ 131. Nuclear Energy for Peace................221
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