1014 SEC. 19. EDUCATIONAL APPLIANCES. 



4198. Model of a Suction Pump. 



* Royal Prussian Chief Mining Department, Breslau. 



4199. Model of a Fire Engine (force pump). 



Royal Prussian Chief Mining Department, Breslau. 



4200. Four Optical Lenses, with stands, and a round 

 Paper-Screen, with stand. 



Royal Prussian Chief Mining Department. Breslau. 



4201. Optical Prism. 



Royal Prussian Chief Mining Department, Breslau. 



4202. Steel Magnet. 



Royal Prussian Chief Mining Department, Breslau. 



4203. Two Magnetic Needles, with stands. 



Royal Prussian Chief Mining Department, Breslau. 



4204. Galvanic Cell, for potassium bichromate. 



Royal Prussian Chief Mining Department, Breslau. 



4205. Electro-Magnet, with anchor and stand. 



Royal Prussian Chief Mining Department, Breslau. 



4206. Electrophor, with cover and glass rod. 



Royal Prussian Chief Mining Department, Breslau. 



4207. Small Induction Apparatus. 



Royal Prussian Chief Mining Department, Breslau. 



420S. Small Electro-Magnetical Keyboard and 

 Chiming-work, with paper-roll and marking pencil ; a primitive 

 telegraph model. 



Royal Prussian Chief Mining Department, Breslau. 



4209. Air-Pump, with oblique barrel. 



Royal Prussian Chief Mining Department, Breslau. 



40 1O. Pair of Magdeburg Hemispheres. 



Royal Prussian Chief Mining Department, Breslau. 



4211. Fall Tube. 



Royal Prussian Chief Mining Department. Breslau. 



4212. Two Glass Globes for Air-Pump. 



Royal Prussian Chief Mining Department, Breslau. 



4213. Mercury Granulation Apparatus, with glass cy- 

 linder. Royal Prussian Chief Mining Department, Breslau. 



4214. Heron's Ball, with glass bowl. 



Royal Prussian Chief Mining Department, Breslau. 



4215. Freezing Apparatus, brass stand with glass tubes. 



Royal Prussian Chief Mining Department, Breslau. 



4216. Syphon Apparatus. 



Royal Prussian Chief Mining Department, Breslau. 



