CONTENTS vii 



CHAPTER XII INSTALLATION OF FIXED EQUIPMENT 

 Sec. Page 



69 Wall Sets : 85 



70 Condensers 85 



71 Dry Batteries 85 



72 Protectors 88 



73 " Grounds " 90 



74 Wiring 92 



75 Lookout Station Telephone Sets . . . 94 



76 Howler and Condenser for Vibratory Signalling 96 



77 Coils .. .. 98 



78 Special Installations 99 



CHAPTER XIII INSTALLATION OF TEMPORARY EQUIPMENT 



79 Types of Portable 'Sets 107 



80 Forestry Branch Portable Telephone 108 



81 Adams Hand Set 110 



82 Emergency Communication Kits 114 



83 Temporary Connection to Permanent Lines 115 



CHAPTER XIV MAGNETO TELEPHONE 



84 Introduction 117 



85 Definition of Electrical Terms 118 



86 Parts of the Magneto Telephone 121 



87 Methods of Connecting Telephones to Line 137 



CHAPTER XV OPERATION 



88 Operating Rules 140 



89 Code Signalling 140 



CHAPTER XVI MAINTENANCE 



90 General Principles 142 



91 Line 142 



92 Apparatus 145 



93 " Trouble " 152 



CHAPTER XVII TELEPHONE " DON'TS " 



94 Construction 157 



95 Installation 158 



96 Operation 158 



97 Maintenance. . . 159 



Part III Forest Protection Heliographs and other Signalling Apparatus 



CHAPTER XVIII HELIOGRAPH 



98 The Instrument 160 



99 Use in Forest Protection 160 



ICO Range and Speed 161 



101 Types of Heliographs 162 



102 Heliographs at Lookout Stations 165 



103 Heliographs on Patrol Routes 109 



