174 HENRY DEACON 



of soda which is to be decomposed ; the 

 object being by aid of the fuel gases, to form 

 marketable compounds of soda in the 

 presence of or by the reaction of ammoniacal 

 compounds. An atmosphere of the fuel gases 

 may also be used during the completion of 

 such process or manufacture. Previous to 

 the final escape of the uncombined or un- 

 absorbed fuel gases, they are passed through 

 or in contact with a solution capable of 

 retaining any ammonia contained in the 

 gases. It is preferred to form these com- 

 pounds with the fuel gases under pressure ; 

 coke or anthracite coal is preferred as fuel, 

 the combustion being effected with a strong 

 draught, whilst smoke is to be avoided as 

 much as possible. The heat arising from the 

 combustion of such fuel may be economically 

 employed in heating water, burning limestone, 

 or for any other purpose requiring but a 

 moderate heat, and wherein the fuel gases 

 are not deteriorated or injuriously contami- 

 nated. 



No. 2971. Nov. 30, 1857. A peculiar 

 construction of apparatus for boiling caustic 

 soda or soap liquors so as to prevent any 

 waste by boiling over, or in effervescence. 



No. 1404. June 21, 1858. The puri- 



