CENTRAL SCIENTIFIC CO., CHICAGO, U. 8. A. 425 



No. 11244. 



11212. WRENCH for removing electrode collars from Chambers Xos. 11201 to 11204 $1.10 



0036. ALUMINUM Foil, in books of 25 leaves, 5x5 inches per book .45 



11214. WOODEN SUPPORT for No. 11200, when not on chamber 3.00 



11215. WOODEN CASE for Field Sets Xos. 11224, 11230, 11232 and 11234 8.00 



12962. STOP WATCH, 7 jewelled. 12.50 



11217. ANALYZED LE DOUX PITCH BLEND (about 60% TJ3 08), with Radium data, to be used in 



calibrating Chambers No. 11202 directly in terms of radium emanation, by the solution and 

 boiling method. Enough for 50 calibrations 4.00 



11218. ANALYZED DE DOUX CARNOTITE (about 1.5% U3 08), to be used in No. 11205 Plates in 



Chamber Xo. 11201 for solid comparison per 25 grains 1.50 



11219. ANALYZED LE DOUX CARNOTTTE (about 2% TT3 08) per 25 grams 2.00 



11220. ANALYZED LE DOUX CARNOTITE (about 3 f " c TT3 08) per 25 grams 3.00 



RECOMMENDED SETS. 



11224. COMPLETE FIELD OUTFIT for Ores, consisting of one each Xos. 11200, 11201, 11206, 11212, 

 6036, 11218, 11219, 11220, 11215, 12962, and two No. 11205 105.75 



11226. COMPLETE LABORATORY OUTFIT for Solids, Gases (Emanation Method) and Liquids 

 (Water), consisting of one each Xos. 11200, 11201, 11206, 11207, 11211, 11212, 6036, 11214, 11217, 

 11218, 11219, 11220, and two each Nos. 11202, 11205, 11208, 11209 and 11210 182.50 



11228. SIMPLE LABORATORY OUTFIT for Solids, Gases and Liquids, without battery set, pump, 

 water chamber, and stop watch, consisting of one each Xos. 11200, 11201, 11202, 11206, 11208, 

 11209, 11210, 11212, 6036, 11214, 11217 and 11219 126.75 



11230. COMPLETE LABORATORY AND FIELD OUTFIT for Water Analysis, consisting of one each 

 Xos. 11200, 11203, 11206, 11208, 11209, 11210, 11211, 11212, 6036, 11214, 11215, 11217 and 11219 

 i 120.00 



11232. SIMPLE LABORATORY AND FIELD OUTFIT for Water Analysis, consisting of one each Xos. 

 11200, 11203, 11204, 11206, 11212, 6036, 11215 and 11217 110.00 



11234. SIMPLE FIELD OUTFIT for Water Analysis, consisting of one each Nos. 11200, 11203, 11206, 

 11212, 6036, 11215, 12962 and 11217 100.00 



11244. ELECTROSCOPE, land Gamma Ray, as used by the United States Bureau of Mines. This is a 

 single unit outfit, not interchangeable, consisting of a nickel-plated brass cylinder 13 cm high 

 and 9 cm in diameter, with lead lining inside 3 mm thick. The leaf system is in the discharge 

 chamber itself, into which is also fixed, by means of a split collar with heavy screw, the reading 

 microscope with numbered scale. The chamber is mounted on one end of a wooden base 33 x 6 

 inches, along which extends a nickel-plated track 27 inches long on which a light carriage sup- 

 port for the radium tube may be fixed by a binding screw at any desired distance from the 

 discharge chamber. The carriage supports the radium tube horizontally at a height just oppo- 

 site the middle of the chamber. The radium tube is held by a light spring clip against a con- 

 cave bar, graduated in l^e inch divisions, to facilitate centering the tube and determining its 

 length. A removable lead screen 6 x 6 x ^4 inches is placed immediately against, the discharge 

 chamber, to shield it from the radium tube. Complete as described. (See Bulletin 104, of the 

 United States Bureau of Mines, Chapter V) 80.00 



11246. ELECTROSCOPE, Gamma Ray Outfit, for the measurement of tubes of radium or of emanation, 

 suitable for use by physicians and hospitals, consisting of Gamma Ray Electroscojft? No. 11244, 

 Stop "Watch No. 12962 'and Charging Rod Xo. 11206 ". 95.00 



MINERALS FOR RADIO-ACTIVITY 



11250. CALC-SPAR, in pieces about 40 x 15 x 6 mm per piece .75 



11251. CARNOTITE (Radium Ore). High grade specimens. 



Xo A B C 



Size Small. Medium. Large. 



Each .75 1.50 2.25 



11252. FLUORSPAR CUBES, approximately 13 mm on a side per cube 1.50 



11253. KUNZITE, fluorescent per 6 grams 1.50 



11255. THORIUM NITRATE per ounce 1.10 



