PERIODS (\F ELECTRICAL VIBRATIONS. 209 
nea 
a a 
S Ps 
Zk “A 
- : ee 
N 
= 
Length of straight wire\in cms 
/ {__ 180 200 3000 We 
Big, 1. 
Table I1L—OPEN CIRCLES. 
Length of circular arc. 
Perimeter of rectangle in | Perimeter of rectangle. 
Final Earlier tune with circular are. Length of circular are. 
‘method. methods. 
320 760 2°38 
380 886 2°33 
450 1030 2°30 
460 1050 2°28 
The relation connecting these values is shewn graphically 
in Fig. 2. 
