178 



METHODS OF COMMUNICATION FOR FOREST PROTECTION 



CONVENTIONAL SIGNALS 



End of word. .3. 

 End of a sentence. .33. 

 End of a message. .333. 

 Acknowledgment, 



or I understand. .22 22 3. 



Eepeat last word. . 121 121 33. 

 Repeat last message. .121 121 121 

 Wait a moment. .1111 3. 

 Signal faster. .2212 3. 

 Cease signalling. .22 22 22 333. 



4 ALPHABETICAL SQUARE CODE 



This code is constructed according to a very simple rule which may be easily 

 remembered, so that it is possible to improvise the entire code at any time. Aside 

 from this it would not appear to "have any marked advantage over other codes. The 

 code is made by arranging the letters of the alphabet in five vertical columns of five 

 letters each, K being omitted and C substituted for K wherever it occurs. Each letter 

 is then represented by a number of two places, the first figure being the number of 

 the column in which the letter occurs, counting from the left toward the right, and 

 the second its place in this column counting from the top downward. This arrange- 

 ment is as follows : 



The alphabet follows: 



a=l-l f=2-l 



! g=2-2 



l-5 



i=2-4 

 j=2-5 



1=3-1 



n=3-3 

 o=3-4 

 p=3-5 



q 4-1 

 r=4-2 

 s=4-3 



w 5-2' 

 x=5-3 



u=4-5 



z=5-5 



Each letter is made by sending short flashes only, to the number of each cf the 

 two elements of the letter, with a short pause amounting to one beat of time between 

 these elements. A pause of two "beats of time is allowed between the letters, and 

 between words there is either a pause of three beats or the long flash may be used, as 

 with the 'Myer code. The latter is to be preferred with poorly trained operators. 

 Thus the letter M (3-2) would be represented by three short flashes, a pause of one 

 beat of time, and then two short flashes. Experiment has shown that a message may 



