446 



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



No. 12238. 



No. 12242. 



AUGERS, see Soil Sampling Apparatus. 



BINS OE CONTAINERS for Soil, see general heading Bins or Containers. 



12238. BOTTLE, Mechanical Analysis, convenient for separating soils into their constituent parts, as 

 described in Hosier and Gustaf son's "Soil Physics Laboratory Manual." Complete with in- 

 verted rubber stopper and tubes $0.75 



CARBONIC ACID APPARATUS, see general heading Carbon Dioxide Determination Apparatus. 



12242. CENTRIPUGE, Soil, for preparing soil samples for Mechanical Analysis. This machine is of 

 excellent design, having features suggested by agronomists. The motor is mounted with shaft 

 vertical, thus obviating considerable vibration and allowing easy access to the soil tubes. A 

 brass trunnion arm, mounted on this shaft, carries eight soil tubes, which are of heavy well 

 annealed glass and are encased in aluminum sheaths. These sheaths are held in trunnions to 

 the trunnion arm by hardened steel bearings. The whole is protected by a metal covering, 

 which extends to the floor or table on which the motor rests, access to motor and tubes being 

 gained by means of a hinged cover. 



Complete with % h. p. motor, of 1800 r. p. m. no load speed, ready for mounting on a table top, 



and eight soil tubes. No A B C D 



A.C. D.C. 



For volts 110 220 110 L'i'O 



Each 100.00 95.00 110.00 



12243. EXTRA SOIL TUBES, heavy glass, as 



used in No. 12242 each .15 



per dozen 1.50 



12246. CENTRIFUGES, International, Electric, 

 with equipment for mechanical analysis 

 of soils, including speed control rheo- 

 stat; No. 2685 Eight-tube Head; eight 

 No. 2710 Metal Tubes, 100 cc, with No. 

 2711 Trunnion Kings; eight No. 2718 

 Eubber Cushions; 72 No. 2716 Plain 

 Glass Tubes, 100 cc; and an 8-tubo 

 Hack. Dimensions: 23 inches high, 

 closed; 35 inches high, open; and 24 

 inches in diameter, with a shipping 

 weight of about 300 pounds. 



No A B C D 



A.C. D.C. 



For volts . . 110 220 110 220 

 Each 138.00 138.00 108.00 108.00 



2716. TUBES, Glass, plain, lipped, 100 cc, for 

 No. 12246 Centrifuge, .per dozen $2.30 



No. 12246. 



