SWEDEN. 



ISl 



on wliich is displayed a target representing a balloon 7 meters 

 in diameter with its gondola and lines. If no such elevation 

 is available, a balloon is made of paper and inflated with hot 

 air. To maintain the heat a sponge saturated with alcohol 



Fig. 38. 



is held under the hole in the bottom of the balloon by cross 

 wires. The alcohol is ignited when the balloon is to ascend. 



±.]t 



S0£ _ 



Fig. 39. 



Fig. 40. 



It is controlled by a marline cord which leads to a place of 

 shelter from which the balloon can be raised and lowered. 



