1052 SEC. 19. EDUCATIONAL APPLIANCES. 



4334. Apparatus, globe, and ring, for demonstrating the 

 expansion of metals by heat. 



E. Leybold's Successors, Cologne. 



Magnetism. 



4335. Simple Diving Element. 



4336. Double Diving Element. 



4337. Galvanoplastical Apparatus. 



4338. Pair of Carbon Points, with handles. 



4339. Apparatus for making Wires red hot. 



4340. Water Decomposition Apparatus. 



4341. Electro-magnet, with two binding screws. 



4342. Electro-magnetical Driving Machine. 



4343. Induction Apparatus, for extra current and secondary 

 current. 



4344. Bar Magnets. 



4345. Horse Shoe Magnet. 



E. Leybold's Successors, Cologne. 



Electricity. 



4346. Simple Electrical Machine. 



4347. Electrical Tuft. 



4348. Simple Gold-leaf Electrometer. 



4349. Fundamental Apparatus, according to Werners, for 

 friction electricity, magnetism, and galvanism. 



4350. Electrophorus, 210 mm. in diameter. 



4351. Electrical Shower of Balls. 



4352. Electrical Pistol. 



4353. Electrical Discharging Bod. 



4354. Simple Chime of Bells. 



4355. Leyden Jar, 156 mm. high. 



4356. Isolating Stool. 



E. Leybold's Successors, Cologne. 



