Sweden 



349 



Fig. 118 shows the operating connections, with details of the 

 keys. It will be seen that the operator replies to a call by pressing 

 the key and speaking on the right-hand cord, and that the desired 

 subscriber is called by merely pressing the same key lower down 

 while the operator is still speaking to the caller. None of the 

 metallic parts of the keys can be touched. A connection counter, 

 or at least a counter of the number of times the connection key 

 is operated, is included in the arrangements. There are already 

 over 1,000 subscribers working on this board, the ultimate 

 capacity of which is 6 x 18 sets of 100 jacks = 10,800, and the 

 designers are perfectly satisfied with the results obtained. The 

 general outline of the board resembles that shown in fig. 114, 



REPEAT JACKS 



ta 

 ANSWERING JACK 



ACCUMULATORS^ 



SELF RESTORED 

 DROP 



FIG. 117 



without the overhanging projection. The measurements of tables 

 and jacks are the same. 



The Stortorget switch-board, by Ericsson & Co., consists of 

 six tables of 300 lines, and is designed for an ultimate capacity of 

 7,800. It is on the single-cord principle, with jacks measuring 

 ii x 13 mm., the set of 100 occupying 70 x 249 mm. 



The Bell Company's board, also by Ericsson & Co., has 

 only two tables, each for 300 subscribers and three operators. 

 The subscribers' lines are arranged for double-cord switching, but 

 the inward junction lines terminate in separate cords. The jacks 

 are of the same dimensions as those at Brunkeberg, and the board 

 may be expanded to take 3,600 lines ultimately. 



