l6o TiMEHRl. 



and i.oio, and divide by 25, the difference between 

 1.025 and 1. 000. 

 Thus 3 inches x 15 = i.to inches. 



25 

 or H of ^ = H or 1.8 inches. 



If the tons per inch of the sinkage of a ship at various 

 draughts are known, the weight of the cargo and stores 

 may be checked. 



We will suppose that a ship has a sinkage of 20 tons 

 per inch in salt water, and it is required to take in 150 

 tons, the increase in her mean draught would be as 

 follows : — 



20)150 Tons(=7| inches. 

 At the load draught a weight of 20 tons is ascertained 

 to sink a ship one inch, the load water area would be 

 20 X 35 = 8,400 feet. 



_i_ 



1 2 



A steamer has a load water line area of 15,000 square 

 feet, her increased draught on taking in 150 tons would 

 be 



150 X 35 = '35 feet or 4^ inches. 

 15,000 

 A steamer's mean draught is 21 ".5, after coaling the 

 mean draught is 22". 5' and the load water area is 7,500 

 square feet, the quantity shipped is as follows : — 

 22' .5' 



Sinkage i. o ^T'.o' 

 Then 7,500 x i =214.? tons. 



35 



