THE PHOTOGRAPHY OF FISH. 



69 



END SUPPORT 



Tank with Bicycle Tube. 



of the plate glass, which was purchased. The writer 

 purposely omits measurements, which depend entirely on 

 the length and breadth of the glass sides. An idea, how- 

 ever, of the general proportions can easily be gathered 

 from the figure. A B, C D, the two end supports, 



are each formed of two pieces ol 

 half-inch oak picture-frame mould- 

 ing, so placed that their rebates 

 'are inside facing one another, and 

 joined at top and bottom by 

 sash screws to allow of their 

 separation in a horizontal direc- 

 tion. One half ot each support is fixed by screws 

 to the baseboard E, the other half remaining free to 

 move. The whole system is so arranged that the plate 

 glass sides slide easily up and down between the 

 rebates of the supports, but cannot fall outwards. 

 Between the two glass sides is a portion of an old inner 

 tube of a bicycle tyre, the two 

 ends of which are done up 

 tightly with wire ; the valve F 

 is left intact, and occupies the 

 lowest portion of the tube, as in 

 the figure. The inflation of the 

 tube presses the glass sides 

 against the rebates of the sup- 



- r i Simple Tank with Gas Tubing. 



ports, and makes a fairly water- 

 tight tank, which can be made perfectly water-tight by 

 the addition of two clamps, as at G and H. The width 

 of the tank obtainable is obviously limited by the bursting 



