324 Description of a Camp Telegraph. 



The flexible ball is constructed in the following man- 

 ner : 



Take an ash or deal stafFof the required length, and the 

 substance of a stout pike. Take twelve whalebones, four 

 feet six inches long, and fix them at nine inches from the 

 top of the staff, in the way the whalebones of umbrellas are 

 fixed : — fix the lower ends of these whalebones to a strong 

 slide (like the slide of an umbrella), the pipe of which must 

 be 18 inches long, and project upwards. To the top of 

 this pipe, stretchers 18 inches long must be affixed, and 

 also to the middle of each whalebone, like the stretchers of 

 an umbrella, to keep the ball stiff when in use. Theie must 

 then be a strong umbrella- spring fixed on the staff, at three 

 feet from the upper fastenings of the whalebones, or top of 

 the ball, so that, when the slide is pushed up, the whale- 

 bones will form a sphere of three feet diameter. 



The skeleton of the ball being thus prepared, it is to be 

 covered with glazed linen, half black and half white, di- 

 vided vertically. Letter G is a drawing of the skeleton of 

 the ball, but only showing two whalebones instead of 

 twelve. When the balls are not in use, they will be un- 

 sprung, 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 cen- 

 tre-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 distinguish them 

 from common lights. % They must be suspended upon a pin, 

 put through a strong iron frame, resembling the frame of a 

 sign which is fixed upon an upright 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 per- 

 pendicular position. 



The reservoir for the oil must be made like those for the 

 agitable lamps; the wicks must be flat, and about one inch 

 broad. 



£. is a front view of the lamp for night signals. 

 r. is a side view of the same. 



A code of numerical signals, and a numerical vocabulary 



applicable 



