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.— Cables on which cable tests were 

 made. 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. 



