CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. A. 



397 



No. 10248. 



No. 10250. 



No. 10256. 



No. 10258. No. 10260. 



No. 10264. 



10238. SUPPORT for Conductivity Cells, consisting of heavy non-corrosive metal base and rod, with 

 clamp for holding cells, hard rubber terminal with mercury wells and binding posts and with 

 clamp for attachment to thermostat. 



No A B C D E P 



For Cell No 10210 10214 10218 10226 10230 10234 



Each $7.50 7.50 7.50 7.50 7.50 7.50 



10240. COTJLOMETER, Washburn's Iodine, as used at the United States Bureau of Standards for deter- 

 mining the value of a Faraday. Complete as illustrated with anode of platinum-iridium, 

 cathode of platinum, bulb tubes, and ground-in siphon tube. Price dependent upon market price 

 of platinum. (See Journal of American Chemical Society, Vol. XXXVI, No. 5, for May, 1914, 

 page 916.) 



10242. ELECTRODE, Calomel Normal, Bloom, designed specially for measurements in Physiological 

 Chemistry. With f used-in platinum electrode, ground on tube and cap 4.50 



10244. ELECTRODE, Calomel Normal, Drucker, with fused-in platinum electrode and side tube, without 

 stop-cock on siphon tube 1.50 



10246. ELECTRODE, Calomel Normal, Hildebnmd, with glass stop-cock on siphon tube and fused-in 

 platinum electrode. (See Journal of American Chemical Society, Vol. XXXV, No. 7, for July 

 1913, page 851) ' 3.75 



10248. ELECTRODE, Calomel Normal, Ostwald, with removable platinum electrode and glass stop-cock 

 on siphon tube 7.50 



10250. ELECTRODE, Calomel Normal, Pauli, for liquids of high resistance, with removable platinum 

 electrode, and short siphon tube 5.00 



10256. ELECTRODE, Dipping, for good conductors, for immersion in liquids to be tested; in protecting 

 cylinder, with platinum electrodes. Weight of platinum, about 1.3 grams 15.00 



10258. ELECTRODE, Dipping, for poor conductors, with parallel platinum electrodes. Weight of 

 platinum, about 1.2 grams 15.00 



10260. ELECTRODE, Dipping, for poor conductors, similar to No. 10258, but of larger capacity. Weight 

 of platinum, about 0.6 gram 12.50 



10264. ELECTRODE, Pipette, for poor conductors, for measuring solutions affected by the air and for 

 measuring solutions at 100 C. With glass stop-cock. Weight of platinum, about 1.6 grams 



15.00 



