APPARATUS FOR TEACHING CHEM1 STIIV. 865 



4103. Diagram, showing elevation, section, and plan of a 

 working-bench in the Laboratory of the Strasburg University. 



Chemical Institution of Strasburg University. 



4104. Photographs of a portion of the principal room of the 

 Laboratory belonging to the Berggewerkschaft Association of 

 Miners at Bochum. 



Berggewerkschaftskasse, Bochum, Rhenish Prussia. 



4105. Hofmann's Apparatus for showing the simultaneous 



Decomposition of hydrochloric acid, of water, and of ammonia. 



Julius Schober, Berlin. 



4106. Hofmann's Apparatus for showing the Constancy of 



the Proportions in the combination of hydrochloric acid gas 

 with water. Julius Schober, Berlin. 



4107. Hofmann's Apparatus for showing the Synthesis of 



Water. Julius Schober, Berlin. 



4108. Hofmann's Lecture Boom Eudiometer. 



Julius Schober, Berlin. 



4109. Hofmann's Apparatus for demonstrating that the 

 volumes of oxygen which enter into the composition of carbon and 

 sulphur dioxide are equal to the respective gas volumes of these 

 compound gases. Julius Schober, Berlin. 



40 1O. Hofmann's Apparatus for illustrating the Phenomena 

 of Combustion. Julius Schober, Berlin. 



4111. Models from Mitscherlich's Chemico-technical 

 Collection, representing 



(1.) A puddling furnace. 



(2.) A coke oven. 



(3.) The lower part of a blast furnace. 



Professor A. Mitscherlich, Munden. 



4112. Hofmann's Apparatus (No. 1-16). 



Messrs. Warmbrunn, Quilitz, 8? Co., Berlin. 



(1.) Apparatus for the electrolysis of hydrochloric acid, of water, 

 and ammonia. 



(2.) Apparatus for illustrating the synthesis of hydrochloric 

 acid. 



(3.) Apparatus for showing that hydrogen and chlorine when 

 united suffer no contraction of volume. 



(4.) Apparatus for showing that two volumes of water-gas 

 (steam) are formed when two volumes of hydrogen unite with one 

 volume of oxygen. 



(5.) Apparatus for showing that ammonia consists of three 

 volumes of hydrogen and one volume of nitrogen. 



.39508. 3 I 



