MAINTENANCE 



143 



By opening switch A, Fig. 92, the telephone is connected to one side of the line 

 only. By closing switch A and opening switch B the telephone is connected to the 

 other end of the line. By closing both switches A and B the line is in normal con- 

 dition. Care should be taken after making tests' that both of the switches are left 

 closed, otherwise no calls can be sent through. 



If desired, provision can be made at any point on the line for testing it in either 

 direction with a portable telephone. In snch cases the line wire should be cut and 

 dead-ended from both directions on the same pole with a two-piece transposition 

 insulator, or two brackets. 



s. 



1! 



00 



s/- 



Fig. 92 Method of installing test-station indoors 



The ends should be left long enough after dead-ending to be joined together with 

 a test-connector, so as to complete the circuit, or a pair of switches may be installed 

 as shown in Fig. 93 and joined to the line with insulated wire. Such stations, how- 

 ever, should not be placed where they are likely to be tampered with. In most cases 

 it would be preferable to house the switches in a suitable box kept locked with a 

 Forestry Branch standard padlock. 



The voltmeter test-stations might be us'ed at logical switching centres. The dis- 

 trict inspector should be consulted, however, before equipment of this kind is pur- 

 chased. 



3 DISCONNECTING BRANCH LINES IN WINTER 



Since any trouble occurring on branch lines to a lookout point or ranger station 

 may injure the entire telephone system, such lines should be disconnected from the 

 main line whenever they will be out of use for a considerable period, especially during 

 the winter. 



The disconnection from the main line may be m>ade by a suitable p>le-switch, 

 properly mounted, as shown in Fig. 40. A Fahnestock test-clamp may also be used 

 for this purpose as in Fig. 38. 



4 STUB KEIXFORCEMENT FOR POLES 



Poles that have become seriously weakened? by butt-rot near the ground-line 

 should be replaced, excopt where condilions are such as to warrant reinforcing them 



