FOREIGN LINES AND CONNECTIONS 



83 



tinned, elamp half -tinned, and un tinned. The first type should be used for connecting 

 two iron wires, the second for connecting a copper and an iron wire, and the third for 

 connecting two copper wires. 



When the main line is of hard-drawn copper wire, it should be cut in two and 

 dead-ended on the same insulator from both directions, splicing in additional wire if 

 necessary. The ends after dead-ending should bereft long enough to be spliced 

 together in a copper sleeve, so as to complete the circuit again. The branch line 

 should then be dead-ended on a separate bracket and insulator, and, the connection 

 made as in Fig. 39. 



r/o/f /engfh s/ccve 



Afer/n //ne 



Afa/r? //ne 



r/ard drawn copper w/' re 



Afa/n //ne cuf and dead ended 

 *v/fh haff /engfh s/eev&s -from 

 hofhd/ reef ions on/nsu/afor/7 

 <7S shown f^nds /eff/ong enoug* 

 offer dead end/ ng fo besp//ce 

 together as shown 



r/ard drawn copper w/re 

 Soffcoppcr w/re same size asorancfi //ne 

 ~i rubber covered 6ro/dedand 

 weafherproofcd copper M /re) 7 wraps 

 a f each end as shown 

 So/dc/ 



Shown ~for one w/re //nc Carounded 

 c/rcu/f) ~fo//ow same mefhod for 

 mcfa///c c/rcu/f 



Fig. 39 



Method of connecting branch line to main line when both are hard-drawn 

 copper wire 



Whenever any wire is connected to a hard-drawn copper line, the latter must 

 always be dead-ended for that purpose, so that the wire may be soldered to a point on 

 the dead-end loop between the sleeve and the insulator. When soldering is not 

 feasible, the wire should be cleaned bright, and the wire to be connected should be 

 closely wrapped around the line wire not less than seven times. A Fahnestock clamp 

 may be used here also. 



When connecting a branch line to a tree line the branch should be dead-ended on 

 a tree by the method prescribed in Section 60 and shown in Fig. 33. The main line 

 should be held by a crosstie and the connection between the branch and the main line 

 made with a piece of No. 14 insulated copper wire attached as shown in Fig. 40. In 

 order to facilitate separation of the branch from the main line, a method of installing a 

 switch when making such a connection is illustrated in this figure. 



2 TYPES OF INSTRUMENTS 



Where a Forestry Branch line is to connect with another line, either directly or 

 by switches,. the resistance in ohms of the ringer coils in the instruments (and exten- 

 sion bells, if used) should be the same as the resistance of those on the connecting line. 

 The standard resistance of all ringer coils on exclusive Forestry Branch lines will be 

 2500 ohms. However, in connecting with lines that use other resistance ringer coils, it 

 will be necessary to use the same resistance coil in instruments on the Forestry Branch 

 line. Where telephones of other resistance than that specified are needed for use, the 

 district inspector should be consulted as to the proper set to purchase. 



79211 6^ 



