18- 



PEESH-WATEE AQUARIA. 



front must be framed as well as the top. A useftil size for an 

 aquarium of this description will be 24in. long, 20in. wide, and 

 lOin. deep. If the tank is to be made of slate and plate-glass 

 only, the directions given for making an aquarium like Fig. 8 



will be enough, except 



that in the place of a 



t I glass side there will be 



I a slate one, and for this 



' the grooves, instead of 



being ^in. deep and fin. 

 broad, ought to be ^in. 

 deep and l^in. broad. 

 This is a most useful 

 and durable aquarium. 

 Fig. 26 represents a 

 very easily and cheaply made aquarium. It is a small tank. 



I 



^/ 



Via. 26. Portable Aquarium. 



chiefly useful for observing the habits of insects and the like. 

 Being of little weight, it can conveniently be moved about 

 when full of water. It is deeper and narrower in proportion 

 than a aquarium in which fish are kept ought to be. The 

 foundation is made of lin. 

 well-seasoned wood (maho- 

 gany answers the purpose 

 excellently). Cut a piece 

 14in. long by llin. broad. 

 At lin. from the edge, all 

 round, make a groove Jin. 

 wide, and the same deep ; 

 bend four pieces of zinc 

 motilding according to the 

 instructions already given, 

 lOin. long. Bore a hole ^in. 

 in diameter at each comer 

 of the grooving in such a 

 way that the square part of the moulding when sunk in the wood 

 wiU come flush with the outside of the groove ; and when this 

 has been done make a cutting with a keyhole- saw to receive the 

 flat portion of the zinc upright (Fig. 27). Drive gently with a 



Fig. 27. Bottom of Portable Aquarium, 

 showing Grooving for Glass and Zinc 

 Moulding. 



