110 



METHODS OF COMMUNICATION FOR FOREST PROTECTION 



case by screws. A wooden block on top bears the two binding-post connections and' a 

 spring clip in which the detachable generator erank is carried. Inside the lid of the 

 leather case is a diagram of the connection (Fig. 63). The hand set is carried i 



small compartment alongside the rest of the essential apparatus and is connected per- 

 manently to the set by a stout receiver cord. A small, black button at the receiver 

 end must be pressed while using the set for talking or listening. This takes the place 



Fig. 63 Wiring diagram of Forestry Branch portable telephone 



of the switch-hook in the ordinary telephone. The 'battery employed is a three-cell, 

 Hat, flash-light type, such as the 703 Ever Ready. This battery is inserted by remov- 

 ing the two top screws on the side bearing the generator crank and .shoving the bat- 

 tery in with the contact plates foremost. When it is desirable to use the ordinary 

 type of dry cell with the set, one or two may be connected by insulated wires attached 

 under the heads of the screws that fasten the battery contact springs located in the 

 back of the battery, chamber. As the button on the hand set closes the battery circuit 

 it is particularly necessary to be sure that it is not depressed by the receiver cord 

 or case when the set is packed, as otherwise the battery will rapidly exhaust itself. 

 The hand set is of very light aluminium and must be carefully protected against 

 injury. Dents near the switch may make contacts that reduce or destroy the efficiency 

 of the instrument. 



Section 81 Adams Hand Set 



1 USE IN FOREST PROTECTION 



The necessities of the more highly specialized forest protection forces demand a 

 type of instrument that may be available to every member of the field staff, regardless 

 of the transport facilities employed. Experience has demonstrated that oiily an instru- 

 ment that may reasonably be described as a pocket type will meet these requirements. 

 When it is remembered that some of the more perfectly organized forces require hourly 



