59 



Iodide of potassium, like the above, and free from iodic acid, 

 therefore entirely unchangeable. 

 Salicylate of sodium, easily soluble in water and alcohol. 



1876. Prepared by E. Schermy, Berlin. 



190. Model of Netherfield Chemical Works, Duke 

 Street, Glasgow. 



1888. Exhibited bij R. and J. Garroway. 



191. Models of stoneware distilling apparatus as used 

 by manufacturing chemists and others, and comprising 

 still, still head, false arm, dip arm, condensing worm, 

 three receivers with connecting pipes and taps, mixing 

 pan, and stone jar. Made of improved vitrified stone- 

 ware, and warranted to resist the action of the strongest 

 acids. (Two sets.) 



1876. Exhibited by James Stiff If Sons .'.London. 



192. Diagrams of a blast furnace, gasworks, and glass- 

 house. 



1857. Exhibited by J. J. Griffin $ Sons. 



193. Models of furnaces (2) for a brewing copper and 

 a brewing pan. 



E. 125 and 126. -1868. Made byj. Schroder, Darmstadt. 



194. Model of Hofmann's circular kiln. 



1876. Lent by Hermann Wedekind. 



This kiln is used for calcining lime, drying bricks, and similar 

 processes. It is circular in form with a chimney in the centre, 

 and is capable of being divided by iron doors sliding in vertical 

 grooves ; in practice, however, only one door is used. Each 

 compartment is provided with an external door for charging in 

 material, and a flue leading from the lower right-hand corner 

 into the central chimney. 



The iron door is placed on the right-hand side of the chamber 

 which has been last charged, the chamber on the other side of 

 the door being empty, or being charged, while the one next to 

 that contains material which has been in the kiln longest. The 

 external doors of these last two chambers are the only ones 

 which are open, and all the flues are shut except the one belong- 

 ing to the chamber last charged, that is, the one on the left side 

 of the iron partition. Thus, the air entering the external doors 

 passes from left to right, going first through the material which 

 hafl been in the kiln longest, gathering heat from this, and 



