476 



Transactions. 



It remains now to cite some actual methods employed, with the results 

 attained. 



Pipe earths, as well as the plate earths before mentioned, were used 

 by the Christchurch Qity Council (diagram No. 6). These were placed in 



Att Copper Cabit bound 

 icjsr/ea/cd /o pipe 



'' M>/arT7c/'er Pipe. 



•^ J^'O: Corfhcnryare /}ip^ 

 pacA ed tvi th coKt. 

 and roc/( oa/K 



excavations 6 ft. to 7 ft. deep. The bottom of the pipe was packed with 

 a mixture of rock salt (refuse salt from tanneries) and coke, while round the 

 top was placed a drainpipe filled with rock salt and coke, and protected by 

 a cover. Water was then poured in 



The lead was ^ S.W.G. braided 



