400 



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



No. 10340. 



Nos. 10364-7. 



10340. MOLECULAR WEIGHT DETERMINATION APPARATUS, Beckmann 's, by the Freezing 



Point Method. Consists of a glass cooling jar with nickeled cover and stirrer, 4 air jackets, 

 4 freezing tubes with corks, 3 filling pipettes, 1 inoculating rod, 1 rubber stopper, zinc trough 

 with glass siphon for drawing off the cooling solution, and sulphuric acid drying tube for use 

 with hygroscopic solutions, but without thermometers $18.00 



Parts and Accessories for No. 10340. 



10341. AIR JACKET 75 



10342. COOLING VESSEL with nickeled cover and stirrer 3.25 



10343. FILLING PIPETTE 1-00 



10344. FREEZING TUBE, with corks 1.00 



10345. FREEZING TUBE, with ground in stopper and ground in tubulation for thermometer. . . . 2.00 



10346. INOCULATING ROD 80 



10347. STIRRER of glass with platinum ring containing about 2.1 grams platinum. Price dependent on 



market price of platinum. 



10348. SULPHURIC ACID DRYING TUBE 1.00 



13452. THERMOMETER for cooling mixture, graduated from -20 to 40 C., in 1 degree divisions 2.00 

 13518. THERMOMETER, Beckmann Differential, with auxiliary scale, graduated in 1/100 degree di- 

 visions 20.00 



10350. ZINC TROUGH, with siphon 2.80 



10351. SIPHON only of No. 10350 1-00 



10364. MOLECULAR WEIGHT DETERMINATION APPARATUS, Beckmann, by the Boiling Point 



Method. Consists of an iron support with clamp and ring; boiling cylinder with drying tube, 

 ground stopper and tubulature, and with inner condenser; one pair glass jackets with mica 

 cover plate and asbestos pad; rubber stoppers; but without burner or thermometers. .. 18.00 



10365. BOILING POINT TUBE for No. 10364, with ground in stopper and tubulature 8.00 



10366. MICRO-BURNER for No. 10364, with glass chimney 1.50 



10367. STEAM JACKET for No. 10364, for use with liquids of high boiling points, with inner con- 



denser 6 - 



THERMOMETER, Beckmann Differential, for No. 10364, see No. 13518. 



