88 



CHAHfiES OF GREATEST EFFICACY FOR ARTILLERY AT SEA. 



Nature ot 

 ordtiaiicc. 



Thickness of ti.e side of t 



he ves-el. 



4 ft. 9 in. 



4.t. 7... 



4 ^>. 8 in. 



Pounder. 

 12 



6-596500 



lbs. 

 6-716436 



lbs. 

 6-83b372 



18 



8-8600 l^ 



9*02 1332 



91 820-^6 



24 



10 70;,651 



io-90-:37i 



1 1 •(.199093 



32 



1 ^-973003 



13*^.i08876 



13-44^74;:) 



36 



1 14-032476 



14-287612 



14-542748 



42 



1 15-55207 



15-834840 



1 16117605 





4 ft, loin. 



4 ft. 11 in. 



5 ft. in. 



12 



lbs. 

 6-956308 



7-076244 



; 9503474 



Ib^. 

 7-I96I8O 

 9-6641 88 



18 



f 9*342760 



24 



1 11 •293-! 14 



1 n-4S85'35 



11-083256 



3 2 



1 IO(;806-22 



13-910.05 



1 14155;3b8 



36 



1 14-^y7884 



1 15-U53<"J0 



1 15308156 



42 



j 16-40U370 



1 16 683135 



1 16965900 



ixplanatior^ 

 of the Cable. 



In this table the first column contains the nature of the 

 ordnance, and the numbers in the other coiuuins are their 

 respective charges of gunpowder in pounds, when the thi,tk>? 

 ness of the object to be destroyed is as specified at the top 

 of the columns. If the thickness be given in iiiches and 

 parts of inches take such parts of the ditference between 

 the charge for the given number of inches and the next 

 greater, and add them to the charge first found for the given 

 number of inches for the charge required. 



The value of the decimal pact of each will be had by 

 multiplying it by 16, the number of ounces in a pound, 

 and pointing oft' in the product trojn the right hand towards 

 the left as many places for decimals as ar,e contained in 

 the given decimal, and retaining the ^)umber on thp left of 

 the point for the ounces, iucieasing it by ^, |, |-, or 1, when 

 the first figure of the decimal is 2, 5, 7, or 8, respectively. 

 This hint is merely given for those practitioners into whose 

 bands this table may fall, who are not very conversant in 

 decimal arithnietic. 



ScHOLlUIkic 



