Let us imagine two metal rods placed in line and constituting what is called a linear oscillator.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming
We may say that the transmitting aerial, the receiving aerial and the earth form one gigantic Hertz oscillator.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming
The secondary circuit of this last oscillation transformer has two extension wires to it, turned in the same manner, to respond to the primary oscillator; and in the circuit of one of these extension wires is placed a coherer tube, short-circuited by a relay and a local battery.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming