8 4 



THE NEW WORLD OF SCIENCE 



ACCURACY OF LOCATIONS 



After the capture of the St. Mihiel salient and again after the 

 armistice, surveys were made by the army topographers of the 

 gun positions which had been located by sound-ranging and 

 the data from these surveys were used by the officers in charge 

 of the sound-ranging sections to determine what errors had 



MAP SQUARE 28 



A.I. ,3. 

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Individual &#:& 



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P4759 



Figure 6 



been made in their locations. This study brought a number 

 of interesting results to light, some of which are of theoretical 

 interest to physicists and meteorologists and some of which 

 are of practical importance in pointing the way to improvements 

 in any future sound-ranging service in the army. The chief 

 result of practical importance was that the average value of a 

 small number of locations obtained under different weather 



