654 Capacity at the Ends of Circular Resonator. 
Observations were first taken with a resonator with bare 
ends, the distance between them being varied from 0°05 em. 
to 4:7 ems. Two other resonators were tried, one with 
spheres 1:7 cm. in diameter on its ends, and the other with 
spheres 2°2 cms. in diameter, the length of the wire connect- 
ing the two spheres being 152 ems. long in both cases. The 
following is a table of the results obtained, the distance 
between the knobs being the length of the gap in the 
circuit. 



TaBLE IV. 
| TORE ees Noreen at Distance between | Perimeter of 
Wire-length. | yo epeeres | surfaces of _ rectangle in tune 
| at ends of wire. | 1 ae 
| | spheres. | With resonator. 
| / 
aE a a | Se ae et _—— 
152 ems. 00 0:05 cms. | 404 ems. 
” +) ” 3°05 ” ) 387 28 
| oa 7 470", | Sete 
| 
| 1520, : 1:70 cms. 020.4 | pp eee 
” ” ” 2 | 0-78 9 420 ” 
” ” re) ” 9°10 oe) 396 ” 
RS Bah oe 2:20 ,, 020); | | 
| oy) ed 9 3” 0°78 2) | 423 9 
| 9 9 ” % | 3°95 ” | 404 ” 



The relations between the values given in the above table 
are shown graphically in fig. 7. 
melres 

Wave fenglhs 
a2 FAS. 6 7) Sr 
Distance apart of knobs cms. 
Without Krobs thus: — 22) (ee ee 
With knobs '7inm diam thus —- —-x 
=) (dol 22a. Side == —-—9o 
The curves show the effect of extra capacity at the ends of 
the resonator in increasing the period of the free vibration. 
The effect of bringing the ends of the resonator closer 
together is to increase the end capacity and hence the period. 
In separating the ends practically no change is made in the 
