38 



REPORT — 1851. 



require to be modified by seamen according to local circumstances. For example 

 tides by creating currents sometimes cause ships to swing against the wind. 



k-^ 



/^ -N 



Fig. 3. 



isr 



\"W- 



Figure 

 for the 

 Southern 

 hemi- 

 -E sphere. 



V.^ 



Ship in 

 right-hand 

 side of gale. 



':,-y- 



Fig. 4. 



Figure 

 for the 

 Southern 

 hemi- 

 sphere. 



Ship in 

 left-hand 

 side of gale. 



