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Introduction to the Study of Science 



represented as located at certain points, as at their respective centers 

 (page 256). 



Diagram III shows the center of weight located to the right of that 

 of buoyancy, and both near the edge of the boat. How will the boat 

 behave? Will it tend to right itself or to tip farther? 



Compare diagrams IV and V with I and II. In which type of 

 hull, the flat-bottomed or the round, does the center of buoyancy shift 

 more rapidly when the boat is slightly tipped ? 



What will happen with the forces located as in diagram VI ? Why ? 

 Comparing diagrams VII and VIII with I and II and IV and V, which 



VII 



\ / 



-\ f""7" 



FIG. 118. Centers of weight and buoyancy. Arrow pointing downward 

 represents center of weight ; arrow pointing upward, center of buoyancy. 



type of hull would give the greatest stability? Give reasons for your 

 answer. Suppose you have a hull with a small keel, as in diagram 

 IX (a), how would its stability compare with that of the shapes already 

 considered ? What will be the effect on stability of a long, deep keel, 

 as in diagram IX (6) ? 



153. Means to secure stability. Builders aim to secure 

 stability of boats by design and construction, but they often 

 make use of ballast and other devices to make boats more stable. 

 Many inventors have devised boats and rafts that have stability 



