1060 SEC. 19. EDUCATIONAL APPLIANCES. 



4491. n. Treble-radiating Jet Burner. 



4492. o. Iserlohn Gas-stove Burner, with one emission 

 dug. 



4493. p. Iserlohn Gas-stove Burner, with double emission 



4494. q. Blow-pipe-table Adjustment, according to 

 Magnus. 



4495. r. Blow-pipe-table Adjustment, with two stop- 

 cocks 011 stativ, and porcelain plates, according to Kohrbeck. 



4496. s. Apel's Stove. 



4497. t. Universal Stand, of iron^with Finkner's patent 

 burner, four rings, and three retort-holders. 



4498. u. Iron Filtering Stand, with three rings. 



4499. v. Schellbach's Retort-holder. 



Jr. J- Rohrbeck, J. F. Luhmc fy Co., Berlin (Dr. Herm. 

 HohrbecK). 



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

 Instruments. 



a. Apparatus for ascertaining the volume proportions of hydro- 

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

 cocks, and iron stand. 



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

 volume 01 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 baronieter- 

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

 ratus, boiling and cooling vessel and serpentine-pipe. 



c. 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 0, 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. 



