the Transmitting Antenna in Wireless Telegraphy. 133 
Taste If. 
Inductive Method. 

} 
Distance, in cms., of minima from free end of wire. 
| 







Length of ar So en 
antenna, A. 2) C. iB 
ms, } 
‘ With cylinder With earth With equal With end 
capacity. | connexion. | wire. free. 
eee (ae ate MW RD Ree ects 140 
225 184 190 | (ID) LOO), Wome. 10") 2a... 
250 200 180 (90). None. iene 
300 [238] 187 | [225] | 148 
400 187, (265) 185 185 | 160, (280 ?) 
500 180 180 180 183 
600 186, (375), (520) 200, (520) | 182 | 167, (415) 
700 188, (637) 200 180 | 148, 617 
800 191, (745) 200 | 189 te Abe acide 
900 200, (790) | 200; (380), (790)| 193, (790) tae 
1000 180, (320) 205, (800),(920)) T80) (S60) nak 
Mean ...| 188°4 193 184°1 


Mean of 188°4, 193, 184°1=188°5 cms. 

In A, B, C there is a gradual fall from the free end to the 
other, which gives the fundamental of the wire itself ; but 
superposed on this and more prominent than it is another 
oscillation very definitely formed as far as the first minimum. 
This is unquestionably due to the oscillation of the condenser 
circuit, and the distance from the free end to the minimum 
is a quarter wave-length of it. 
With wires of lengths 225 and 250 ems., in disposition ©, 
there is to be seen only the fundamental of the wire, while 
with length 300 cms., in dispositions A and C, the minimum 
appears abnormally displaced. The curves in these last 
two cases are not so smoothly formed and are not considered 
in the calculation of the means given in Table II. The 
mean of the three means given in the table is 188-5 cms., 
which I take to be the quarter wave-iength of the condenser- 
circuit oscillation. 
The curves obtained with disposition D, shown in fig. 9, 
differ somewhat from the others. Here the variation of 
potential at the end joined to the transformer is almost as 
great as that at the free end. This is due, without doubt, 
to the fact that the antenna and transformer secondary 
together compose a single conductor, and the fundamental 
