Bui. 1107, U. S. Dept. of Agriculture. 



Plate X. 



Fig. 1.— The upper cage incloses section of 

 regular commercial cable and two suspen- 

 sion rings. The lower cage incloses section 

 of dead cable used as a check. Insert, view 

 showing repair of telephone cable made 

 necessary by an attack of the lead-cable 

 borer. Photograph by H. E. Burke and 

 insert by R. D. Hartman. 



Fig. 2. — Test cables inside of cage, suspended 

 by various types of rings. Some have direct 

 current of electricity and some are without 

 current; some were treated with various 

 repellents and some were normal. Photo- 

 graph by H. E. Burke. 



Fig. 3.- 

 made. 



-Cables on which cable tests were 

 Photograph by H. E. Burke. 



Fig. 4.— Section of cable and small cages built 

 around it. These inclosed a section of the 

 messenger strand, several suspension rings, 

 and a section of the cable. Beetles were 

 introduced into the cages to see if they would 

 enter the cable. Photograph by H. E. 

 Burke. 



THE LEAD-CABLE BORER. 



