474 



WRITINGS OF JOSEPH HENRY. 



[1875 



It appears from Table 1 that without a single exception 

 the duration of the sound was greater at the top of the tower 

 than at the bottom, although the difference in favor of the 

 top of the tower in the several experiments is very variable- 

 These results are in accordance with what was anticipated. 



Table 2. — Sound with the wind. 



In the observations recorded in Table 2 the durations of 

 the sound at the bottom and top of the tower are nearly the 

 same, from which we might infer that the elevation of the ob- 

 server has little effect on the hearing of sound moving with 



