Plate IV 



Experiments. 



jce Bay , □ Black & Red 

 k. 

 f Red 

 J Black. 



erpool Bar Lighl- Ship, Black . 

 )recambe Bay Light Ship, Red 

 ti Liverpool Bar Light- Ship, 



on of Zti& stations 



tiaZelz/ Ihe positions w7her& tfie fis7i 7iave 



