UNDERWATER TELEPHONY CHALLENGES

49Guflehnio Narconi yK C 4N3taowrls eerh l itsý relativel li. I nnt e hiittgi tre iattiivly lit itrfaiy otlse. I Th tel I nn bllie pecally ofrmtlit toiny la about 100 mJiles. In extnt t a mutter of fuat itrdinary able Itphony thas not yet tlaken pla e hetwn England and lhol land although these two countries pave such intiumant commierchial rela atcnS that there can be no question About th demand SThe trouble in underwater cable tepelphany lies in the very pronounced distortion which takes place after the electrical waves which are the equiv elant of the vocal sounds have passed few miles through the cable.

Even aIn the twentyodd miles between Eng pand and France it has been found pecessary to place on the ocean bed ppedal appliances for overcoming this. I distortion These appliances add con. I iderably to the expense and upkeep i of the circuit hlow it is a curious fact that at though an electrical oscillation pro ected through an undersea cable be. I comes rapidly distorted an electrical.

I rave radiated across the ether by a. I modern wireless apparatus retains its original characteristics however great the distance over which it may travel.