WEBSTER AND ALLEN— EXTERIOR BALLISTICS. 



385 



away by a bullet. It is possible to measure the velocity of a bullet 

 when the strips of tin foil are an inch apart, but in general a dis- 

 tance of two or three feet is conveniently taken. This may be con- 

 trasted with the distance of one hundred or one hundred and fifty 

 feet generally used in ballistic laboratories of arms companies. 



The table of results is given both for a small saloon rifle and 

 for a 44 calibre gun. It is not claimed that this method would be 

 of great use in the open, but in a laboratory it is certainly a very 

 great convenience. 



PROC. AMER, PHIL. SOC , VOL. LVIII, Y, DEC. 4, I919. 



