.MISCELLANEOUS. 873 



4260. Chromic Acid Element, small, bottle-shaped, with 

 two graphite and one zinc plate. 



4261. The same, larger, with two graphite and one zinc plate. 



4262. The same, with three zinc and one graphite plate. 



4263. Coal-light Apparatus, with small reflector (hand re- 

 gulator). 



4264. Water Deposition Apparatus. 



4265. Oxy-hydrogen Gas Apparatus, Werner's construc- 

 tion. 



4266. Constant Battery, according to Stohrer. 



4267. Twenty pair of Plates. 



4268. Boussole's Tangent, with movable compass. 



4269. Horizontal Galvanometer, box-shaped. 



40 7O. Multiplicator, according to Schweigger, for thermo- 

 electrical currents. 



. 4271. Table Galvanometer. 



4272. Electro-Magnet, arranged for a table, and for suspen- 

 sion. 



4273. Apparatus for showing the rotation of a magnet. 



4274. Apparatus for showing the rotation of two magnets, 

 caused by a current. 



4275. Magnet, rotating around its own axis. 



4276. Electro-Magnetical Oscillating Apparatus, with 

 supporter for Geissler's tubes. 



4277. Electro -Magnet, rotating under the influence of ter- 

 restrial magnetism. 



4278. Electro-Magnet, rotating in a second, with contrivance 

 for lifting weights. 



4279. Machine, according to Page. 



4280. Electro- Magnet rotating above a steel magnet. 



4281. Barlow's Wheel. 



4282. Lightning Wheel, according to Neef. 



4283. Apparatus, according to Petriua, showing the attrac- 

 tion of parallel currents. 



4284. Ampere's Frame, according to Eisenlohr. 



