[ToC]

 

H. M. Dowsett, Wireless Telephony and Broadcasting, Gresham Pub. Co., 1924

FIVE SPACE WAVES LEAVING AN EARTHED VERTICAL AERIAL OF APPRECIABLE CAPACITY, SHOWING THE WAVE INTENSITY AT EARTH LEVEL, AND ALONG A RAY INCLINED AT AN ANGLE TO THE EARTH

Fig 6 shows this wave-front expanded to a distance of five space waves from the aerial. It will be seen that the wave-loops do not meet at the zenith, the expansion of the various curvatures, including that of the wave-back, lopping off the top part of the wave. An endeavour has also been made in this diagram to indicate the intensities of the space waves at earth level and along a ray projected at an angle into the upper atmosphere.