Construction for Steering Course of a Ship. 565 



measuring down, the true path is got by drawing 

 AiCi parallel to SiB l9 

 C^ parallel to S 2 B 2 , and so on. 



The dashed letters in the lower half of diagram give a 

 path where K is negative. It is evident that if the first 

 steering direction is positive, all the steering directions for 

 that path are positive, and if the first is negative all are 

 negative. 



6. Regarding limiting values of K : (1) K positive. If v 

 is negative, construction is always possible since T is always 

 outside the circle. 



But if v is positive, T must lie between V and the circle. 

 Therefore K must not be less than u-\-v. 



Rfir. 8. 



In fig. 8 velocities in belts are 2 and 4, u = 5, limiting 

 value of K is 9. AiCiC^ is the true path for this value. 

 K must be greater than 9 if the path is to cross the second 



