RELATIVE TO DIFFERENT PARTS OF GUNNERY. 1G9 



six ounces and throe quarters, the ball being in contact with the cartridge. It will be 

 perceived, by this experiment, that the gun had, previous to bursting, withstood the force 

 of two discharges of the same quantity of powder, with the bull at a distance from the 

 cartridge. 



4. In the next gun, the ball each time was placed at the distance of two inches from 

 the end of the cartridge; the charge was regularly increased from six and a quarter 

 ounces, and the bursting took place at the seventh discharge, with eight ounces of 

 powder. 



5. In the next experiment the ball was constantly placed at the distance of six inches 

 from the end of the cartridge, and the charge regularly increased until the bursting was 

 produced, with nine ounces and three quarters of powder. 



f>. The ball, in the next experiment, was placed alternately at the distance of twelve 

 and four inches from the cartridge. The firing commenced with six ounces of powder, 

 and was regularly increased until the gun burst. The last charge was seven ounces and 

 three quarters, and the ball at the distance of four inches from the cartridge. 



7. In the next experiment, the gun was loaded with two bulls, placed at the distance of 

 twelve, and four inches from the cartridge, and also in contact with the same. The balls 

 were fired in succession, with the same charge, from each position, and when the process 

 was repeated with an increased charge, the bursting took place at the sixth discharge, 

 with four and a half ounces of powder, and the balls in contact with the cartridge. In 

 this case also the gun burst, after having withstood previously two discharges of the 

 same quantity of powder, and a space between the balls and the cartridge. 



Another set of guns had previously been cast of the same weight and dimensions of 

 those we have described, but of metal of finer texture, and greater tenacity. In reference 

 to the question under consideration, two of these guns were burst in succession; the 

 following are the particulars and results: — 



1. The first was charged in succession with one ball, placed in contact with the powder, 

 the charge being regularly increased from seven ounces. The bursting took place with 

 nine ounces and a quarter. 



2. The other gun was fired in succession with the ball placed at the distance of twenty- 

 one inches and nine inches from the cartridge, and in contact with the same. The 

 experiment began with a charge of seven ounces, and the bursting was produced with 

 eight ounces and three quarters, the ball being in contact with the powder. 



The general results of these experiments arc the same as those with the other set of 

 guns. The bursting took place with the ball in contact with the powder, and in both 

 cases after the gun had withstood two discharges of the same quantity of powder with a 

 space between the cartridge and the bull. 



The following is a recapitulation of the results with the first set offfuns. 



With shot rammed home, from the mean of three experiments, the bursting charge wai 6| oz. 



With space of two inches, bursting charge, . 8 oz. 



With spucc of four inches, 7* oa. 



With space of six inches, p 9* oz. 



