MAKING AQTTABIA. 11 



the flat part of the zinc into the narrow groove of the block 

 Pig. 12, the bar not having been withdrawn. 



Take the block Fig. 13, place it over the tubing now formed 

 in the zinc, and by striking it (the block) with a hammer rectify- 

 any inequality which may have appeared in the moulding. 

 Separate the steel bar from the zinc and slide the latter, tubing 

 downwards, into the iron-faced block (Fig. 

 14). Then with a chisel or other like tool 

 open the flat portion of the zinc now facing 

 upwards until it forms as nearly as possible 

 a right angle (Fig. 17). When this has been 

 done, withdi-aw the moulding from the block, 

 and it should now have assumed the shape pm 17 



of Fig. 18. If the edges be found to be not 

 quite straight and tme, they may easily be made so by 

 hammering them on a side of the mitre-block. 



Bend all the other strips in the same way, and then take 



two of them the length of the proposed aquarium and two of 



its breadth, and mitre them together. The mitre cuts can 



readily be made by means of an old tenon-saw and an ordiaai-y 



mitre-block. Having fixed them in position (Fig. 



19), solder the comers neatly and firmly together, 



taking care to have the fiat portions of the 



moulding perfectly square — that is one edge quite 



perpendicular and the other perfectly horizontal 



i ji (Fig. 20). This will be for the bottom of the 



I I W aquarium. 



I I Now take four other pieces of moulding, corre- 



^^ spondiag to the last four, and repeat exactly the 



same operation, and then the top of the tank will 



f 



i 



ShTpe OP l>e formed. Next join the top and bottom together 

 MOULDING ^* *^® corners by means of the remaining foui- 

 pieces of moulding. Fig. 22 wiU show the way in 

 which these joints are to be made. Care, of course, should be 

 taken that everything is square and true. The framework of 

 the aquarium -will now be complete. It will be, if properly 

 done, very strong. 

 For a bottom, cut a piece of zinc or slate (the latter being far 



