28 



ON RIFLED GUNS. 



Pressures and ranges; 100-pound gun. 

 [No. 7 i* the powder used in rihvy heavy guns; No. 5 in army 8 and 10-inch columbiads. No. 5 is slower than No. 7.] 



No. 



Elevation. 



Charge. 



Projectile. 



Pressure — lbs. 



Range — yds. 



1 



2 



3 



4 



5 



C 



7 



8 



9 

 10 

 11 

 12 

 13 

 14 

 15 

 16 

 IT 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 2G 



27 



28 



29 



30 



31 



5 degrees -- 



...do 



...do 



...do 



...do 



...do 



• 



1 degrees . 



...do 



...do 



...do 



15 degrees . 



....do 



....do 



....do 



....do 



....do 



....do 



....do 



....do 



....do 



....do 



....do 



20 degrees . 



....do 



....do 



....do 



....do 



....do 



....do 



....do 



....do 



10 lbs. Dupont 7 



... do do 



10 lbs. Hazard 7 



.. .do do 



10 lbs. Perm 5 



10 lbs. Doremus comp. 



10 lbs. Dupont 7 



do -do 



10 lbs. Hazard 7 



...do do 



10 lbs. Dupont7 



...do do 



...do do 



10 lbs. Hazard 7 



do do 



do do 



10 lbs. PennS 



do do 



do do 



10 lbs. Dupont 7 



10 lbs. Hazard 7 



10 lbs. Denn 5 



10 lbs. Dupont 7 



do do 



do do 



10 lbs. Hazard 7 



do do 



do do 



10 lbs. Penn 5 



do do 



do do 



Shot, 99^ lbs 



do 



do 



do 



do.. 



do 



Shell, 101 lbs 



do 



do 



......do 



Shell, 101 lbs 



Shot, 99J lbs ■ 



Shot, 82 lbs 



Shell, 101 lbs 



Shot, 994 lbs 



Shot, 82 lbs 



Shell, 101 lbs 



Shot, 99|lbs 



Shot, 82 lbs 



Round shot, 32 lbs. 



do do . ... 



do do. ... 



Shell, 101 lbs 



Shot, 991 lbs 



Shot, 82 lbs 



Shell, 101 lbs 



Shot, 994 lbs 



Shot, 82 lbs 



Shell, 101 lbs 



Shot, 994 lbs 



Shot, 82 lbs 



38, 000 

 45, 300 

 80, 000 

 86, 000 

 27,500 

 114,000 

 66, 400 

 69, 300 

 70,200 

 87, 000 

 60, 350 

 64,000 

 66, 000 

 99, 020 

 102,980 

 89, 000 

 61,750 

 40,200 

 41,600 

 27, 250 

 39, 300 

 20, 000 

 65,800 

 48, 650 

 81,000 

 102,900 

 102,000 

 98,000 

 50, 000 

 91,500 

 39, 300 



2,078 

 2,180 

 2, 251 

 2,308 

 2,221 

 2,370 



Not taken. 



4,796 

 5,030 

 5,190 

 4,735 

 5,iil5 

 5,254 

 4,808 

 4,70<; 

 5, 038 

 *3,701 

 *3, 352 

 *3, 195 

 5,853 

 6,125 

 6,338 

 5,762 

 5,972 

 6,273 

 5, 698 

 6,2-111 

 5,991 



* Wild in direction. 



It is sufficient simply to run the eye over the last two columns and note the almost entire 

 absence of correspondence between the plug indications and the ranges, to be satisfied of the 

 little reliance to be placed upon the former. 



(26 — It is of importance to gun practice that the pressures of gases arising from the 

 burning of different kinds of powder be accurately ascertained, and a series of experiments, 

 free from all objections, and having for its object to supply this information, is desirable. 



(27) — To find the greatest gas pressure to which a gun of given dimensions should be 



subjected without impairing its quality of endurance, substitute in Eq. (10) for M - the 



(340) 



P 



