EXTENSION OF THE TELEPHONE SYSTEM TO SHIPS 147 



New Jersey, for the permanent transmitting station. This station 

 as it now appears is shown in Fig. 1. The permanent building was 

 preceded by a temporary structure to house an experimental trans- 

 mitting station which could be used as a model for the design of the 

 four final sets to be located in the permanent building. 



Preliminary studies were also made to determine the proper form 

 to give to antennas suitable for three channel operation without 

 excessive cross-talk, and this study indicated that by the use of 

 series inductance and capacity the antennas could be stiffened enough 

 to prevent excessive coupling effects and still pass the required fre- 

 quency band. 



While this work was going on, a two-way telephone set for use 

 aboard ships was developed, and in the spring of 1920 one of these 



Fig. 1 



sets was installed aboard the steamship Ontario of the Merchants 

 and Miners Transportation Company. Experimental communica- 

 tion with this ship, by means of the model transmitters at both Deal 

 Beach and Green Harbor stations, showed that commercial opera- 

 tion, at least for one channel, could be maintained. 



By the fall of 1920, the construction work on the four transmitting 

 and receiving channels was completed and early in December a 



