MISCELLANEOUS. 883 



4500. Professor A. W. Hofmann's Apparatus and 

 Instruments. 



a. Apparatus for ascertaining the volume proportions of hydro- 

 gen and chlorine, consisting of \/-shaped tube, with two glass stop- 

 cocks, and iron stand. 



b. Apparatus for proving, that at the formation of the HC1, one 

 volume Cl and one volume H combine ; consisting of a glass tube, 

 with two stop- cocks, decomposition apparatus, and two pipe sup- 

 porters, calcium chloride cylinder, and a vessel for the electrolytical 

 analysis of hydrochloric acid. 



c. Water-decomposition apparatus for demonstrating that 2 vol. 

 hydrogen and 1 vol. oxygen are the volume proportions of water ; 

 consisting of a triangular tube, with two stop-cocks, and platinum 

 electrode (the tube also graduated) ; iron stand. 



d. Steam-tight apparatus, consisting of one graduated barometer- 

 tube with envelope-pipe, iron stand with holder, measuring appa- 

 ratus, boiling and cooling vessel and serpentine-pipe. 



e. Apparatus for ascertaining the volume proportions of nitro- 

 gen and hydrogen in ammonia ; consisting of tube with stop- 

 cock and stopper, a glass cylinder, movable table, and glass bowl. 



f. Apparatus for ascertaining the volume proportions of the 

 elementary constituents of HC1, H 2 O, and NH 3 , by electrolytical 

 means ; consisting of two glass apparatus with coal-electrodes, a 

 water-decomposition apparatus- with platinum electrodes, and three 

 iron stands. 



f 1 . Apparatus for proving that at the combination of the respec- 

 tive elementary gases HC1, H 2 O, and NH 3 , always two vol. gas 

 are formed; consisting of three y -shaped tubes with platinum 

 electrodes, and three iron stands. 



g. Apparatus for demonstrating that the gases H and Cl com- 

 bine in the constant proportion of 1 : 1 into hydrochloric acid ; con- 

 sisting of a glass tube with stop-cock, and two ground-in stoppers, 

 with stand. 



h. Apparatus for the decomposition of nitric acid ; consisting of 

 a little platinum piston, a stand, a funnel-tube with stop-cock, a 

 pneumatic trough, and a cylinder. 



i. Apparatus for demonstrating the equal volume proportions of 

 simple and compound gases ; consisting of steam apparatus, steam- 

 conducting pipe, glass apparatus with five stop-cocks, and an iron 

 stand. 



k. Apparatus for making experiments with sulphurous acid. 



/. Apparatus for the decomposition of hydrogen phosphide ; 

 consisting of \/-shaped tube with two electrodes, and a stand. 



m. Apparatus for showing the oxidability and capability of 

 reduction of the gas-flame ; consisting of a copper crucible, with 

 tripod and gas-burner. 



3K 2 



