176 HENRY DEACON 



improvements specified are: stopping the 

 evaporation at an earlier stage, removing the 

 salts precipitated during evaporation as usual, 

 and continuing the evaporation or con- 

 centration, until the caustic alkaline liquors 

 will deposit crystals of hydrated caustic soda 

 on cooling to the ordinary atmospheric 

 temperature. The mother liquor to be used 

 for subsequent operations or finished alone. 



No. 1,030. loth April, 1862. A process 

 of obtaining crystals of caustic soda contain- 

 ing more than one atom of water by cooling 

 caustic soda liquors, and then removing the 

 last portions of mother liquors from caustic 

 soda crystals by means of an elevated tem- 

 perature below but approaching to the melting 

 point. 



No. 1,455. Hth of May, 1862. It is well 

 understood that certain colours are produced, 

 by the action of an elevated temperature on 

 mixtures of clays, with sulphate or carbonate 

 of soda, or both, of sulphur and of carbon, 

 atmospheric air being excluded during the 

 first heating. The patent specified improve- 

 ments in the vessels or retorts in which these 

 substances are heated, so that the materials 

 during the process might be easily inspected, 

 stirred, &c., during the heating ; and also the 



