It will be an advantage to begin by explaining the electrical action of the radiator, and then proceed to discuss the details of the transmitting appliances.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming
It will probably assist the reader to arrive most easily at a general idea of the functions of the various portions of the transmitting arrangements, and in particular of the radiator, if we take as our starting point an analogy which exists between electric wave generation for telegraphic purposes and air wave generation for sound signal purposes.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming
First, the lines of electric strain in the plane of the radiator, and, secondly, the lines of magnetic flux at right angles to these.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming