MECHANICAL AND USEFUL ARTS. 



53 



south towards Formby ; and of this distance about 7000 yards bad 

 'been measured, each 100 being marked by a small stake, with other 

 indications of distance as adopted by the Government in their beach 

 trials of long-range guns. The experiments were in progress, more or 

 less continuously, and with different guns, for between six and seven 

 months. 



Mr. Whit worth had five guns at Southport during these trials ; 

 but we have now to dea hvith three only, viz. : — A three- pounder, 

 6 feet 3 inches long, weighing If cwt. ; a twelve-pounder, 7 feet 



9 inches long, weighing 8 cwt. ; and an eighty-pounder, 9 feet 



10 inches long, weighing four tons. The pitch of the rifling varies, 

 there being one turn in 60 inches for the three-pounder, and one 

 in 100 inches for the sixty-eight pounder. Thus Mr. Whitworth 

 adheres to the sharp pitch characteristic of his musket, each gun 

 having rather more than one complete turn in its rifling. 



Mr. Whitworth has issued the following tabular summary of the 

 result of each trial of the 3, 12, and SO-pounders, at different degrees 

 of elevation, which has been carefully prepared : — 



Summaet of Expebime>ts with Mr. Whitworth' s Rifled Cannon, at Southport, 

 showing the Mean Range and Deviation of all the Shots fired at each Experi- 

 ment. 



Column A shows the number of shots fired at each experiment, II shows their 

 average range in yards, C shows their average longitudinal, and 1) their average 

 lateral, deviation from a central poiut, according to the system adopted at 

 Hythe. 



