138 Mr. C. A. Chant on the Variation of Potential along 
Miter A 
Wire. 9 
A. 300 2x 100=200 cms. 
400 2x 120 =240 
360—120=240_,, 
500 2x106=212 ,, 
280 —106=174 
455—280=175_,, 
600 2 100-200 me 
290—100=190 _,, 
700 2x110=990° | 
300--110=190 
800 2x100=200 ,, 
900 2x 20180 
310— 90=220 , 
495 310135) 2 
Bb. 700 2x 100 ==200 
300 —100=200 
500—300=200_,, 
C. 400 2x 105=210 
Mean. ./ 202 
The curves in B and C (figs. 11, 12), are very similar, 
from which it is to be concluded that the simple earth- 
connexion is equivalent to a wire similar to the antenna, or, 
as already indicated in previous experiments, the earth acts 
as a mirror. ; | 
The curves in D (fig. 14) are not so regular in their form 
as those in Band C. There is a gradual fall of potential, 
but the fundamental is not so intense as in the others, and 
there is a superposition of other oscillations. This agrees 
with the statement of de Forest * that with this arrangement 
there is liability to overtones. It is to be observed, too, that 
here again the disturbance is produced at some distance from 
the earth end. 
It is to be noted that none of the curves in A is similar to 
any in C. From this it follows that though as far as the 
Frequency of the oscillations in an open circuit is concerned, 
a capacity may replace an inductance, still the form of the 
oscillations is quite different in the two cases. 
Thus the direct method is, generally speaking, similar to 
the simple system, but it is more regular and more powerful. 
According to Wien f the radiation is thirteen times as intense 
as that of the simple radiator. 
* L. de Forest, N.Y. Electrical World and Engineer, May 17, 1902. 
+ M. Wien, Ann. der Physik, viii. p. 686 (1902). 

