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



233 



No. 5246. 



No. 5254. 



No. 5248. 



No. 5260. 



5246. EXTRACTION THIMBLES, Glass, with round perforated bottoms. Easily cleaned, may be used 

 repeatedly and exact weight determined. 



No 



Length, mm . . . 

 Diameter, mm . 

 Each .. 



A 



80 

 90 



$0.45 



B 

 80 

 33 

 .65 



5248. EXTRACTION THIMBLES, Whatman's Seamless, made from the same material as the Whatman 

 Filter Papers and rendered fat-free by a special chemical process. Can be used repeatedly. 



Xo A B C 



Length, mm 80 80 123 



Diameter, mm 22 33 43 



Per box of 25 3.15 3.55 7.10 



5254. EXTRACTION TUBE, Roehrig's, for use in determining fat in milk and dairy products by the 

 Roese-Gottlieb Official Method of the Association of Official Agricultural Chemists. Gradu- 

 ated to 80 cc in 1 cc divisions with side tube and stop-cock for withdrawing solvent. Complete 

 with ground glass stopper, on wooden base. (See Leach "Food Inspection and Analysis," 

 page 200) 4.50 



EXTRACTION APPARATUS HEATERS 



5260. EXTRACTION APPARATUS HEATER, Cenco Electric, designed by W. H. Boss, consisting of 

 a box of asbestos board 80x20x12 cm, containing a series of resistance coils over which is sup- 

 ported a sheet iron pan. The top of the box is removable and has openings for flasks which 

 rest upon the bottom of the iron pan. By this method the flasks rest upon a hot plate and are 

 surrounded by hot air, thus requiring a minimum current. By means of a single switch arrange- 

 ment, currents from 1 to 4 amperes at 110 volts, in 9 steps, may be obtained, giving a wide 

 range of temperature for solvents at various boiling points. This may be used as an ordinary 

 hot plate by removing the top, or as a liquid bath by using water in the iron box. The supports 

 are adjustable in height with clamps for each extractor and condenser. Complete with covers 

 for holes 60.00 



5262. EXTRACTION APPARATUS HEATERS, Electric, similar in general construction to No. 5260, 

 but provided with six electric lamps instead of the system of heating coils, and without the 

 iron tray. 



Xo. .'. A B 



For volts 110 220 



Each . . 47.50 48.50 



