viii METHODS OF COMMUNICATION FOR FOREST PROTECTION 



CHAPTER XIX USE OF THE GODWIN HELIOGRAPH 

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104 Parts of the Instrument 169 



105 Using the Godwin Heliograph ' .. 170 



CHAPTER XX SIGNALLING WITH THE HELIOGRAPH 



100 Selecting a Station 173 



107 Position of Operator 173 



108 Maintenance of Adjustment 174 



109 Opening Communication 174 



110 Working at Short Ranges 175 



111 Working Through Haze and Smoke 175 



112 Heliograph Codes 175 



113 Instructions to Operators 179 



114 Care of Instruments . . 180 



115 Training Operators 180 



116 Heliographing by Moonlight and Artificial Light 181 



CHAPTER XXI NIGHT SIGNALLING 



117 Signalling Lanterns 182 



CHAPTER XXII FLAG 



118 General Remarks 186 



119 Equipment Required 186 



120 Range and Speed 186 



121 Use in Forest Protection 187 



CHAPTER XXIII USING THE FLAG 



122 General Remarks . . 188 



123 Selecting a Station 188 



124 Wigwag Signalling 189 



125 Rules for Operators and Conventional Signals 191 



126 Wigwag Codes 191 



127 Semaphore Signalling 191 



CHAPTER XXIY MESSAGE CODES 



128 Purpose oi Codes 194 



129 Use in Forest Protection \ 194 



130 Combinations Available 194 



CHAPTER XXY DANGER SIGNALS 



131 Risk in Fire-fighting 195 



132 Use of Danger Signals 195 



133 Code of Danger Signals 195 



134 Miscellaneous Uses of Shot and Whistle Signals 196 



