PHOTOGRAPHING FISH 95 



as by so doing it interferes with the circulation of 

 the water. A small block placed inside the grooves 

 at the lower end will prevent this. 



An extra bottom board covered with white oil- 

 cloth will be found useful when photographing fish 

 that stay on the bottom. This board should have 

 an arrangement by which it can be tilted so that the 

 end farthest from the glass may be elevated. 



Handles at either end of the aquarium are useful, 

 but they should not be used when it is full of water; 

 the strain is too great, and is likely to cause leakage. 

 So much for the aquarium. Now we come to its 

 support, and for this I can recommend nothing more 

 simple or more efficient than a pair of wooden horses, 

 upon which two long thick boards should be placed. 

 The length of these boards must depend on the focal 

 length of the lens that is used. The camera placed on 

 these boards, as 

 shown in the ac- 

 companying dia- 

 gram (Fig. 3), 

 may be moved 

 back and forth at 

 will. It is sel- 

 dom necessary to 



. . Fig- 3- 



raise it more than 



a couple of inches, and this may be done by using 



one or more thicknesses of board beneath the camera. 



