Ships and Shipping. 167 



Or specific gravity or weight per cubic foot. 

 2716 ozs. 

 62^ lbs. per cubic foot 



5.432 

 16,296 



168,392 

 1,358 



169,750 



96 contents 



1,018,500 



1.527,750 

 — — tons cwts. qrs. 



2240) 16,296,000 (752 

 15,680 



112) 616 

 560 



28) 56 



As we have stated, goods are usually freighted by 

 weight, and at different weights, and light goods are 

 shipped at times, exceeding 40 cubic feet to the ton ; 

 they are also shipped by quantity and number, but in 

 almost every case the term "ton" is used. The number 

 of tons weight that form the cargo of a ship will there- 

 fore vary according to the kind of goods loaded. The ton 

 of commerce is thus an arbitray quantity, but a ship can- 



