98 



METHO'D OF COMMUNICATION FOR FOREST PROTECTION 



To line 

 Howler 



Condenser^ 



To be atfoched to wo /I 



pieces of leather and screws 



Lightning 

 Protector 



Ground 



Fig. 50 Method of connecting howler and condenser 



Section 77 Coils 

 1 LAVITE COILS 



These coils are used to remove static electricity from the line. Each coil should 

 have a resistance of 48,000 ohms, and be inclosed in a small weather-proof box. (See 

 Section 93, Static Electricity) . It will generally be necessary to install these coils 

 outdoors on poles along the line. The method of installation is illustrated by Fig. 51. 



2 KEPEATING COILS 



The standard 47-A repeating coil is generally placed indoors as part of one of 

 the special installations described in Sectjon 78. In such cases no special precautions 

 with regard to the placing or wiring of the coil are required, except to see that it 

 is guarded by the protective devices in the same manner as the other apparatus and 

 that the eight connections are properly soldered. 



In some cases the necessity arises for placing one of these coils outdoors. When 

 this is required the coil should be placed near the top of a pole and the latter may 

 be provided with pole-steps if desired. Coils should not be installed on trees. Two 

 protectors will usually have to be placed between the coils and the lines, and the, 

 whole inclosed in a waterproof box. The method of making such installations is 

 fully illustrated in Fig. 52. 



