Nikola Tesla - Free-Energy Devices

THKRMO-MA ONETISM AND P7RO-MA QNETISM. 431In tlie steam-exhaust pipe H is a valve v, to which is connectedthe lever i, by the movement of which the valve is openedor closed. In such a case as this the heat of the firemay heutilized for other purposes after as much of it as may be neededhas been applied to heating the core u. There are special advantagesin the employment of a cooling device, in that themetal of the core B is not so quickly oxidized. Moreover, thedifference between the temperature of the appliedheat and ofthe steam, air, or whatever gas or fluid be applied as the coolingmedium, may be increased or decreased at will, whereby therapidity of the magnetic changes or fluctuations may be regulated.