623 
THE ELECTRIC POTENTIALS PRODUCED IN THE CONDUCTORS 
OF A SUBMERGED CABLE BY UNDERWATER EXPLOSIONS 
A, H. Bebb and R, V. Bund 
a Re OV Bundy 
October 1945 
ober 1945 
The origin of "cable Signals” has been qualitatively analysed and 
methods of treating the cable are discussed with the object of reducing 
these Signals, One specified treatment has been shown to effect a 
redustion of 500 times, 
INTRODUCTION. 
of polythene, the outside diameter of which is 0.43", hig is further 
covered with a tough rubber Sheath, and the overall diameter of the cable 
The constants of this cable are as follows:- 
a) Inductance: 0.43 uw H per metre; 
b Capacity: 59 up F per metre; 
Surge impedance: 85 ohms; 
The variation of capacity with frequenay up to 
1 megacycle/second is negligible. 
A reduotion of Some 500 times has been achieved by coating the inner 
telcothene core of the above cable with graphite or aquaedag: this, of 
course, is the surface which is in intimate contact with the outer conductor 
of tinned copper braid. 
Road @ecce 
