HYDROGRAPHIC INVESTIGATIONS 



61 



extended, observations arc made as far as possible simul- 

 tancouslv elsewhere in all Northern Kurnpean waters.* 



In the Irish Sea area semi-diurnal records are made of the 

 surface temperature at the various light vessels, hourly records 

 are made on the Lancashire Fishery Committee's investigation 



Surface chart, August 1896 



Atlantic water [>- -~j| Arctic water 



FIG. 9. 



Coastal and bank water 



steamer James Fletcher, and in addition periodic hydrographic 

 cruises are made by the same vessel, these cruises synchronis- 

 ing with those of other fishery research vessels i.e., those of 

 Ireland and Scotland. The hydrographic cruises are usually 



* Further details are given for various localities in the chapter on Ocean 

 Currents. 



