381 
Description of a Camp Telegraph 
The skeleton of the ball being thus prepared, )& is to 
be covered with glazed linen, half black and ha^f white, 
divided vertically . Letter G is a drawing of tlie skele- 
ton of the ball, but only showing two whalebones instead 
of twelve. When the balls are not in use, they will be 
unsprung, and covered with strong cloth cases. 
Signals by Night . 
To make these, it will require two lamps, about nine 
inches square and 12 inches high, to be elevated, one 
above the other, at the distance of three or four feet, for 
the centre-point : and one lamp for each signal-man, to 
be. fixed on the top of the ball-staff. 
Each lamp must have two hollow lenses, about four 
inches diameter, filled with different- coloured transparent 
fluids— (say pale green and pale red),— which will dis- 
tinguish them from common lights. They must be sus- 
pended upon a pin, put through a strong iron frame, re- 
sembling the frame of a sign which is fixed upon an up- 
right sign-post, so that when the staff is raised they will 
swing perpendicularly ; and when they are carried at the 
trail, they will still be in a perpendicular position. 
The reservoir for the oil must be made like those for 
the agitable lamps ; the wicks must be fiat, and about 
one inch broad. 
E. is a front view of the lamp for night signals. 
F. is a side view of the same. 
A code of numerical signals, and a numerical vocabu 
lary applicable to the land service, arranged upon the 
plan of Sir Home Popham ? s for the naval service, will 
be necessary. 
When a tent or any other object is fixed upon as a 
centre-point, it is then generally unnecessary to use the 
double ball. 
When stations are taken below the horizon , the white 
