266 



TENTH ANNUAL REPORT OF 



which could he identified_, I have commenced to reckon time from the 

 first instant of audibility of the sound. 



As will he observed, the annexed observations were made, some at 

 Weld, Franklin county, Maine, and the others at Stillwater, Min- 

 nesota Territory, 



A. 



)Veld, Franklin County, Maine. — TJiunder-storm in the afternoon of the 

 lUh of August, 1850. 



Observed the duration of a single peal of thunder, as follows : 



Lightning flashed seconds. 



I'hunder first audible 10 



13 

 15 

 20 

 30 

 40 

 61 

 Entire duration of the sound, or rolling of the thunder. ! 51 



loud 



very loud 



loudest 



very loud 



loud 



becomes inaudible. 



B. 



Stilhvater, Minnesota Territory. — Thunder-storm in the morning of 



June 24, 1851. 



OBSERVATIONS. 



c. 



Stillwater, Minnesota Territory. — Thunder- sto7'm in the afternoon of 



August 11, 1851. 



OBSERVATIONS. 



Older of peals 



Lightning flashed 



Thunder first audible 



loud 



loudest 



loud 



becomes inaudible 

 duration of 



5. 







3 'r3 '^ 



o ^ -s 

 ^^ S 



CO ^ 2 



s. 

 



27 



Uni- 

 form. 



32 

 5 





 14 



30 



35 

 21 





 29 



37 



82 

 85 

 56 





^^ 



6 





