By the inductive arrangement it is possible to create in an aerial electromotive forces which are equivalent to a spark of a foot in length, and when the length of the aerial is also properly proportioned the potential along it will increase all the way up, until at the top or insulated end of the aerial it may reach an amount capable of giving sparks several feet in length.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming
The speed of the motor can be regulated by a small resistance, and can be adapted to the electromotive force used in the primary circuit.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming
It has already been explained that, in order to charge a condenser of a given capacity at a constant voltage, the electromotive force must be applied for a certain minimum time, which is determined by the value of the capacity and the resistance of the secondary circuit of the induction coil.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming