144 



METHODS OF OOMMUNIOATION FOR FOREST PROTECTION 



tu 

 stuff enafs ive// sp/iced 



white 



/nsu/crto/ 

 So/derec/ 



Staples 



Ptece of board with ley el -- 

 surface, nai/ed to its support 



To testing instrument" 



S/o. /4 B XS Rubber- covered, 

 braided, Heather-proofec/, 

 ftr//sfed pair, copper tv/re 



Bryant k 

 switch tfitkjf'X* 



blue wood screws. 



A/ofe:~ Test stations shou/d not be 



instated w/?ere they ore not 

 necessary. 



THEE 



Fig. 93 Method of installing test-station on a tree 



*by means of a stub of long-lived or treated timber. A stub should ordinarily be used 

 'where suitable pole timber is not available and to reinforce poles that are sound above 

 the ground, irrespective of their condition at the ground-line. 



The stub or post should be peeled and' shaved and roofed, as shown in Fig. 94. 



The sides of the post and of the pole which come in contact should he faced above 

 ; the ground-line to a width of 2 to 4 in., so as to give a greater bearing surface. 



The diameter of the stub at the ground-line should be at least as great as would 

 'be required for a new pole. The weaker the pole to be reinforced the stouter should 

 'be the stub. 



The stub should ordinarily foe set to a depth of 4 ft. and should extend out of 

 the ground about 5 ft., making the total length from 9 to 10 ft. 



Strain on the weakened pole should cause it to bear against the stub. For this 

 reason stubs in general should be set in line with the line wire. Where there are pre- 



