CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A, 



333 



No. 8246. No. 8250. No. 8254. No. 8258. No. 8262. No. 8268. 



No. 8284. 



No. 816. 



No. 8288. 



No. 8292. 



No. 8290. 



No. 8294. 



8268. 



LECTURE APPARATUS, Osborne's Form, for electrolysis of water and for study of conduc- 

 tivity of liquids, ionization, electro-plating and electrolysis of water. A simple, substantial 

 form of electrolytic apparatus that can be used to demonstrate the principles involved in the 

 theory of electrolytic dissociation. It consists of an outer U tube with graduated sliding 

 tubes, shot valves, glass plug and platinum electrodes, which are easily replaced by carbon 

 or copper electrodes (Nos. 8238 to 8240). It allows immediate change of liquids, permits the 

 introduction of an indicator, cloth for bleaching, is reaily cleaned, requires least amount of 

 liquids to fill it. Complete as illustrated, on support with binding posts, with instructions for 

 use $11.00 



8269. GLASS PARTS only of No. 8268 8.00 



8270. SUPPORT STAND* only for No. 8268 3.00 



8276. LENS PAPER, Japanese, for cleaning lenses, in sheets 7x11 inches, in packages of 100 sheets. 



Per package 35 



LENSES, Magnifying, see Magnifiers. 

 LETTERS, Steel, see Dies. 

 LEVELING BULBS, see No. 1902. 

 8284. LEVEL, Bench, Adjustable, with handle and accurately graduated vial. Length, 4 inches; handle 



and tube nickeled, base japanned 3.30 



*2S. LEVEL, Mechanics', Iron, 12 inches long, ground face and ends, japanned body, double plumb 



.' 2.00 



8290. LEVEL, Mechanics', Wood, ordinary type; 10 to 16 inches long. Oval top plate, two side views 



50 



8292. LEVEL, Pocket, Brass, ground flat on the base, nickel-plated; 2 inches long. Very useful in mak- 

 ing apparatus .50 



8294. LEVEL, Pocket, Iron, japanned, 3^4 inches long 20 



816. LEVEL, Round, in brass case, for balance cases, drying ovens, incubators, etc. Diameter, 2.5 cm. 

 4.00 



