vi METHODS OF COMMUNICATION FOR FOREST PROTECTION 



CHAPTER V SELECTING THE TYPE OF CONSTRUCTION 

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32 Pole-line 'Construction 27 



33 Tree-line Construction 27 



34 Construction Methods Contrasted 28 



35 Relative Cost of Different Types 28 



36 Sketch of the Development oi Tree-line Methods 29 



37 Influence of Timber Conditions on Choice -of Construction Type 30 



38 Grounded Versus Metallic Circuits 32 



CHAPTER VI TELEPHONE CONSTRUCTION POLICY IN DOMINION FOREST EESERVES 



39 Construction by the Forestry Branch 33 



40 Co-operative and Private Lines 33 



41 Use of Forestry Branch Lines 34 



42 Telephone Improvement Plans 35 



43 Standard Methods 35 



44 Standard Materials 36 



CHAPTER VII OPERATIONS PRELIMINARY TO CONSTRUCTION 



45 Factors Influencing Location 42 



46 Survey of Route 42 



47 Securing Right of Way 42 



48 Clearing Right of Way 41 



49 Transportation and Distribution of Materials 45 



50 Organization and Equipment otf Construction Crews. 46 



CHAPTER VIII POLE-LINE CONSTRUCTION 



51 Selection of Poles 47 



52 Skidding and Seasoning. . 47 



53 Preservative Treatment 47 



54 Length of Poles 49 



55 Erection of Poles 49 



56 Bracing and Guying . .. 54 



57 Line Construction 59 



CHAPTER IX TREE-LINE CONSTRUCTION 



58 General Principles 68 



59 Selecting Trees .and Route t 68 



60 Line Construction 69 



CHAPTER X EMERGENCY LINES, CONSTRUCTION AND USE 



61 Use in Forest Protection 74 



62 Line Construction 74 



63 .Maintenance. 76 



14 Taking up Wire 76 



CHAPTER XI FOREIGN LINES, CROSSINGS, AND CONNECTIONS 



65 Location on Poles of Foreign Lines 78 



66 Crossings .. 78 



67 Connecting Forestry Branch Lines with Private Lines or Exchanges. ... 82 



68 Branch Lines.. 8 



