'^06 Canadian Forestry Magazine, August-September, ip20. 



Air Maps For Flying Patrols 



How Aerial Rangers Will Wire- 

 less Injormaiion to 

 Land Stations 



In prefacing- this article, it may be 

 stated tliat the following method of map 

 sqtiarini^ has been adopted by the 

 Forestry Branch, Provincial Government, 

 Quebec, Forest Fire Protection Associa- 

 tions, Quebec, and several large paper 

 and lumber companies who operate aerial 

 surveys and fire patrols of their respect- 

 ive timber limits. 



Maps to be used are standard topo- 

 graphical maps, scale 500.00 or 7.8 miles 

 to 1 inch. These maps can be obtained 

 from the Departmeht of Interior at Ot- 

 tawa, and are published in sheets, which 

 can, of course, be joined up to make one 

 large map of any given territory, and 

 each sheet is given a distinctive refer- 

 ence number. Key to these sheet ntini- 

 bers can also, be obtained at Ottawa. To 

 proceed with the actual squaring of these 

 each sheet is divided into 9 

 squares, every degree of lati- 

 ed into 9 squares, every degree of lati- 



tude and longitude forming a square, 

 and numbered from top left-hand corner 

 1 to 9. Each of these 9 squares is sub- 

 divided into 6 squares, which are lettered 

 "A" to "F"; the sheet is now divide! 

 into a total of 54 squares. 



Proceeding along the same lines, in 

 the process of reduction, each of the 

 squares lettered "A" to "F" is divided 

 into 36 squares, and numbered from top 

 left-hand corner 1 to 36. Again, using 

 the same method of reduction, the last 

 mentioned squares are divided into 4 

 and lettered a. b. c. d. in small letters. 

 The final reduction of squares is arrived 

 at by dividing eacli of the latter squares 

 a. b. c. d. into 10,, ,l)ut as die squares 

 are not very small, graduations of lOths 

 are placed on two sides of the squares, 

 these graduations serving as a scale or 

 protractor applicable to any square. It 

 is just a matter of measuring latitudin- 

 ally and longitudinally to any given 



