66 



METHODS OF COMMUNICATION FOR FOREST PROTECTION 



sleeve for hard-drawn copper wire (Fig. 29) ; galvanized-iron sleeves should not be 

 used. Copper sleeves should not be used for splicing galvanized-iron wire, because 

 the resulting corrosion of the latter results ultimately in a high-resistance joint which 

 may become the equivalent, from an electrical standpoint, of several miles of extra 

 line. 



Soft' copper t/e 

 as 



A/of /ess Than 5 fusris 



.v _ 



Fig-. 26 Method of making- regular tie for hard-drawn copper wire 



When copper sleeves are used for joining hard^drawn copper wire, they should be 

 twisted not less than three nor more than four turns with a pair of reversible con- 

 nectors of the No. 309 type. The ends of the wire" should project approximately 1 in. 

 from the end of the sleeve before twisting. After the sleeve is twisted the protruding 

 ends of the wire should be cut off not closer than \ in. and bent back slightly on the 

 sleeve. 



In ordering sleeves it is necessary to specify the size of the wire for which the 

 sleeve is required. In making joints every precaution should be taken not to nick the 

 wire, whether galvanized iron or copper. 



