49 



160. Drawings of Hargreaves and Robinson's appa- 

 ratus for the patent salt cake process. In three frames. 



1876. Exhibited by the Widnes Metal Company, 



161. Borax crystals in the form of a column. 



1888. Exhibited by G. Pursell $ Go. 



162. Products obtained from kelp and seaweed, and 

 other chemicals manufactured at the Whitecrook 

 Chemical Works. 



Exhibited by the North British Chemical Company. 

 1889. 



Sulphur. 

 Caustic soda. 



Sulphate of soda (salt cake). 

 Carbonate of potash. 

 Chlorate of potash. 

 Sulphate of potash. 

 Muriate of potash. 

 Bleaching powder. 

 Common salt. 



Kelp. 



Kelp salt. 



Tangle. 



Tangle charcoal. 



Tangle charcoal (lixiviated). 



Iodine (commercial). 



Iodine, pure (re-sublimed). 



Iodide of potassium. 



Bromide of potassium. 



163. Iodine (re-sublimed). Specimen under glass 

 shade. 



Exhibited by the North British Chemical Company. 



1888. 



164. Illustrations of the manufacture of the algin 

 compounds. 



1889. Exhibited by the Algin Company. 



Kelp substitute (water extract carbonised). 



Cellulose (from seaweed). 



Cellulose (for turning). 



Sodium alginate (soluble soda algin) (2). 



Iron algiuate (with ammonia). 



Iron alginate. 



Barium alginate (insoluble). 



Copper alginate (with ammonia). 



Ammonium alginate (combined with shellac). 



Ammonium alginate (soluble ammonia algin). 



Aluminium alginate. 



Aluminium alginate (with soda, soluble). 



Alginic acid (insoluble algin) (2). 



165. Specimens of native rock salt from Afghanistan ; 

 Wiclicska, in Poland ; and Erfurt, in Prussia. 



1876. Lent by George Gore, F.E.S. 



