Under these conditions, the cell produces a rattling noise and a luminous glow appears round the tip of the platinum wire.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming
In the first stage bubbles of oxygen rise steadily from the platinum wire, and in the interrupted stage they rise at longer intervals, but regularly.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming
Any variation of resistance of the little platinum loops due to the heat produced by the oscillations, by suddenly altering the current flowing through the telephone, will cause a sound to be heard in it.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming