SOAKING MACHINES. 



217 



Scari/ig liitt tf. 



Pig. 7. 

 fourteen miles. No sea to speak of or that might cause large 

 pulsations in the wind. Poles placed close to the water. The 

 waves washed round the two windward pegs. Sand almost level. 

 Rain beating the models down. 



Kite M hung by thirteen feet of cord *15" diameter = 23 sq. ins. 

 of cord for head resistance. 



Kite weighs without ballast 1 lb. 12 oz. 

 Ballast 3 5). 1 oz. 



Total weight 4 lbs. 13 oz. =4-81 H>s. 



Projected area of propeller 2-58 square feet. 

 Load = 1-86 lbs. per square foot. 



When M was loaded with 3 lbs. 1 oz. of lead she hung persis- 

 tently 7° to windward of a plumb line passing through the after 

 end of the tail and the knot that attaches the hanging cord to the 

 horizontal one at the top of the poles. Sometimes she would 

 swing back till the hanging cord was from one to two degrees out 

 of plumb. The plumb line and weight were sheltered as much as 

 possible from the wind by my arm. 



When the kite is drawn about four feet back from the vertical 

 position and released, the hanging cord slacks when the kite has 



