Photographing Fish 211 



go and stay where we wish him. This can be 

 accomplished by means of a glass partition which 

 can be slipped into grooves on the side boards. 

 There should be several pairs of these grooves at 

 different distances from the front glass, so that we 

 can make the compartment in which we wish to 

 confine our subject of any size that we please. 



The plate-glass in the front should be fastened 

 by means of hardwood battens at the sides and 

 bottom, between which and the glass there should 

 also be inserted the strips of rubber so that, when 

 they are screwed down tight, there will be no 

 leakage. 



This tank can be placed on any support and 

 the ordinary tripod used with the camera, but it 

 is convenient to have a support that will hold 

 both tank and camera, which has the advantage 

 of keeping them both upon the same plane. 

 This may be simply a pair of wooden horses 

 with a wide board laid across. This, of course, 

 must be long enough to allow a sufficient dis- 

 tance between the lens and the tank, and will 

 admit of varying the distance between the two 

 easily and at will. If it is found necessary to 

 raise the camera any, this can be done by means 

 of an extra piece of board or two placed under- 

 neath it ; and any simple device for clamping the 

 camera to the board will answer to hold it steady, 

 though, if care is used, this is not necessary. 



