644 Prof. Pollock: Comparison of Periods of 
The relation connecting these values is shown graphically 
in fig. 2. 
Fig. 2.—Open Circles. 
bop CS 
7 ; 
/ 
“a 
/ 
7 
| 
Pevmeler of reclongle micms 


anes 
a ih || : 
| 
| 
y, englh of circular arec\ncms. | 
/ 100 200 300 400 500 
Closed Circuits—In the case of other than circular cireuits 
no attempt was made to make the shape truly elliptical, 
and they must be considered merely as ovals approximating 
1o the elliptical form. The perimeter and the ratio of the 
major and minor axes, given in the table, sufficiently in- 
dicate their shape. The ratio given is the length of the 
axis parallel to the direction of propagation of the waves 
along the circuit to the length of the axis perpendicular to 

.this direction. 
The relation connecting the values obtained for closed 
circles is shown graphically in fig. 3. 
