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



No. 338. 



No. 340. 



338. CENTRIFUGAL EXTRACTOR, Dulin Rotarex No. 1, capacity 50 grams. Will give complete 

 extraction of bituminous aggregates in five minutes. The large size sample insures greater 

 accuracy in the analysis of coarse aggregates and will also extract enough bitumen to be 

 used for tests on the asphaltic cement. Consists essentially of a 110 volt A. C. or D. C. motor 

 mounted vertically on a cast iron base, directly connected to the aluminum extraction bowl. 

 The bowl is surrounded by a cylindrical copper shell, shaped to drain through a spout at the 

 side. The solvent is introduced into the extraction bowl through the funnel shaped screw 

 which holds the filter ring and cover in place. The outer cover is made in two pieces so that 

 the section immediately over the funnel may be removed when the solvent is added. Com- 

 plete with rheostat, cord with plug for attaching to lamp socket, and directions for operat- 

 ing $71.50 



Extra Parts for Dulin Rotarex No. 1 



338A. ALUMINUM BOWL, 50 grams capacity 6.00 



338B. COVER for 50 gram Bowl 2.00 



338C. FILLER SCREW for 50 gram Bowl 2.00 



338D. FILTER RINGS for 50 gram Bowl per 100 2.00 



338E. ALUMINUM BOWL, 100 grams capacity 8.00 



338F. COVER for 100 gram Bowl 2.75 



338G. FILLER SCREW for 100 gram Bowl 2.00 



338H. FILTER RINGS for 100 gram Bowl per 100 2.00 



340. CENTRIFUGAL EXTRACTOR, Dulin Rotarex No. 2, capacity 1,000 grams, with direct drive 



vertical type motor for 110 volts A. C. or D. C., enclosed in cast iron frame. Complete with 

 rheostat, cord with plug for attaching to lamp socket, and directions for operating 128.00 



Extra Parts for Dulin Rotarex No. 2 



340A. ALUMINUM BOWL, 1,000 grams capacity 10.00 



340B. COVER for 1,000 gram Bowl 5.00 



340C. FILLER SCREW for 1,000 gram Bowl 2.00 



340D. FILTER RINGS for 1,000 gram Bowl per 100 5.00 



341. ATTACHMENT PLUG for Xos. 338 or 340, to screw into a 220 volt lamp socket, permitting the 



Rotarex to be connected in series with a 110 volt lamp, when 220 volt circuit only is avail- 

 able . 1.25 



