379 
Description of a Camp Telegraph . 
tion ; and when the director of the station making the 
communication, observes this is done, he gives the word 
“ Down and his signal-men must then retire in dou- 
ble-quick time to the rear of the centre-point, carrying 
their balls at the trail. The word 66 Down ” must like- 
wise be given by the director of the station receiving a 
communication , the instant he observes the signal-men 
at the corresponding station begin to retire. 
A. (Plate 11.) Is the signal of communication , and is 
made by placing one of the signal-men at 20 paces to the 
right, and the other at 20 paces to the left, of the centre- 
point. 
B. Is the signal of a point or period , and is to be 
made at the close of a number, as 275, by placing one 
signal-man three paces to the right, and the other three 
paces to the left, of the centre-point. 
C. Is the signal of error , and is to be made when your 
correspondent has mistaken your last signal Suppose 
you had made the signal No. 2, which is 20 paces to the 
right, and your correspondent answers with 20 paces to 
the left, which is the signal No. 7- Then make the sig- 
nal of error, by placing one signal-man three paces to 
the left, and the other 10 paces to the right of the cen- 
tre-point; and when your correspondent has repeated 
this signal, thereby convincing you he is sensible of his 
error, repeat the signal that had been mistaken , and, if 
rightly answered, proceed as before. 
D. Is the repeating signal, and is to be made if the 
last communication is not understood. It is made by 
placing one signal-man three paces, and the other 20 
paces, to the left. 
JV* amerals . 
No. 1. Is made by placing one signal-man three paces to 
the right of the centre-points 
