182 HENRY DEACON 



The necessary amount of air or oxygen 

 may be introduced at intervals, and need not 

 be more than an equivalent, but I prefer that 

 before the sulphurous acid is first specially 

 treated for the production of sulphuric acid 

 therefrom, it should be mixed with the full 

 equivalent quantity or number of equivalents 

 of air or oxygen, but preferably with a 

 quantity in excess of an equivalent quantity 

 or number of equivalents, but it is not usually 

 convenient to add the whole of this air or 

 oxygen to the burning pyrites or sulphur, and 

 so I arrange the apparatus and materials that 

 the heated gases are brought in contact with 

 heated common salt and over or through 

 heated sulphate of copper (or other similar 

 substances), to form anhydrous sulphuric acid 

 from heated sulphurous acid and oxygen, 

 these substances to be kept separate from the 

 alkaline chloride. 



The claim put forward in this patent is : 

 The manufacture of the sulphates of the 

 alkalies and of chlorine, and of bleaching 

 powder, by causing heated anhydrous sul- 

 phuric acid, mixed with air or oxygen, to 

 come in contact with the chlorides of the 

 alkalies at an elevated temperature, such 

 mixture with air or oxygen being effected 



