CHAPTER VIII. VELOCITY OF PROPAGATION OP ELECTRIC FIELD. 387 

67. Conditions, under which the velocity of propagation of 

the field is of industrial importance. 387 

68. Equations of decrease of electric field with the dis- 

tance. 388 

69. Effect of return conductor on distance decrement of 

field. 389 

70. Inductance of length I of infinitely long conductor with- 

out return conductor. 390 

71. Equations of magnetic flux, effective resistance of radia- 

tion, inductance and impedance. 391 

72. Evaluation of functions sil al and col al. 394 

73. Self-inductive impedance, and numerical example. 395 

74. Discussion of effective resistance and radiated power, as 

function of frequency. 396 

75. Mutual inductance of two distant conductors of finite 

length. 398 

76. Example. 399 

77. Capacity of a sphere in space. 400 

78. Example. 401 

79. Sphere at a distance from ground. 402