20 



combination of ZA and Iron, X.\ i. heat 



fir-t. and the molecules have taken up their full complement 

 of heat before the Iron in the earliest portions <>f a short 

 thermo-couple junction ; Heat, the motive power, is then 

 able to do work, and drives them in frictional stress ag. 

 their slower but more enduring neighbours, which is the 

 true explanation we have been looking for. 



Therefore, under>tanding now the action of this combi- 

 nation, we simply have to continue more experiments, and 

 to make more Thermo-couples to conclusively prove our 

 point, for the greater the friction and flow of molecular 

 vibrations we can really get into play, so long as there 

 continuous flow, and no counter E. M. F. or drag, brought 

 about, the greater will be the E. M. F. produced. 



We might almost compare the molecules of the ZA and 

 Iron to two sets of cog wheels, with their cogs interlocking, 

 but only vibrating, not revolving. The ZA cogs, moving 

 the sooner, act upon the series of Iron cogs, and therefore the 

 faster and stronger the ZA cogs run, the greater the friction 

 upon the cogs of the Iron, and the greater the E. M. F. 

 generated. Or we might compare them to two sets of 

 springs interlocking the ZA springs starting first, move in 

 continuous vibration upon the Iron springs. Evidently, then, 

 if any of these Iron cog wheels in any part of the machine 

 (Thermo-couple) have a quicker and more powerful swing 

 than the ZA cogs, a counter force is brought into play, 

 and a smaller molecular or E. M. V. is prod 



So that, if we can by any process, or by any means, get the 

 Iron cogs to vibrate more powerfully than the ZA 

 we shall still have an electric current set up, because the 

 molecule cog wheel, or the molecule spring, is doing work 

 and setting up a flow of molecular vibrations, though in 

 this latter case the Iron molecular cogs arc the motive \ 

 in friction or with vibratory stress against the ZA COgS, and 

 not the ZA in friction or with vibratory stress ag. 

 the Iron. * 



