CHEMICAL EFFECTS OF PUDDLING. 



123 



A. A flask containing 

 a mixture of chlorate 

 of potash and oxide of 

 coppcr.whichbw 



/ g:ive off a regu- 

 lar cui rent of ox yg.-u. 



B. A bottle contain- 

 ing a concentrated solu- 



f caustic potash, 

 so as to retain any chlo- 

 rine or any oxygenated 

 compound of this gas, 

 which might be pro- 

 duced. 



C. A tube full of 

 pu milestone moistened 

 with solution of caustio 

 potash, and employed 

 with the same new as 

 the- bat 



D. A U tube filled 

 with pieces of solid 

 melted caustic potash, 

 also used for the same 



E. A bottle contain- 

 'phuric aci 



retaining any moisture 

 which might accom- 

 pany the oxygen gas. 



F. A porcelain tube 

 in which was placed a 

 small porcelain dish 

 containing the pulve- 

 rized cast iron. 



0. A tube filled with 

 small pieces of pumice- 

 stone moistened with 

 sulphuric acid, with the 

 Tiew of retaining any 

 moisture. 



EL ALiebigtabefoll 

 of a concentrated eola- 

 tion of caust ic potash, to 

 determine the amount 

 of carbonic acid pro- 

 duced by the combina- 

 tion of the oxygen with 

 the carbon or the cast 

 iron. 



1. A small tube with 

 fragment* of caustie 

 potash, to retain any 

 trace of carbonic acid 

 which might not he 

 absorbed in the Liebig 

 tube. 



To render the absorption of the carbonic acid complete, 

 necessary to conduct the operation very regularly and 



