No. 55 148 a. 



Vapour Density. Molecular Weight. 



615 



1 



55 142, 54 874, 55 144, 51 727. 1 : 5. 



55 146, 55 147, 54 874, 55 148. 1 : 5. 



Beckmann's Apparatus for Molecular Weight Determination by the Freezing Method, Fig. 55,142, 

 improved pattern (Ztschr. fur phys. Chemie, 21, p. 239; W. u. B. phys. Prakt., Fig. 105), 

 consisting of articles Nos. 55,14255,144, 54,874, 51,727, 55,145. 



oo,142. Glass Cylinder with lid and stirrer, 4 air jackets, 2 freezing tubes, 3 filling pipettes, Figure . . 



55.143. Platinum Stirrer, according to market price (Subject to fluctuation) . 



54,874. Metastatic Thermometer after Walferdin, divided in 0,01 C., see Fig. 55,142 



55.144. Electromagnet, see Fig. 55,142 



51,727. Metronome with electric contacts, see Fig. 55,142 



The use of a thermopile, as the illustration shews, is only necessary when no other electric 

 source is available. Prices of thermopiles are given in "Electricity" Section. 



55,145. Pastille Press with steel mould 





Beckmann's Apparatus for Molecular Weight Determination by the Ebullition Method, 

 Fig. 55,146, also in improved pattern (Ztschr. fur phys. Chemie, 21, p. 245; W. u. E. 

 phys. Prakt., Fig. 109), for solvents with a boiling point to about 130 C., comprising 

 articles Nos. 55,14655,148, 54,874. 



r)j,14(i. Boiling Tube with internal cooler and ground-on stopper, 2 air jackets with mica slab, stand on tripod 

 with clamp, sleeve, ring with asbestos wire net, Figure 



55.147. Micro Gas Burner, see Fig. 55,146 



54,874. Metastatic Thermometer after Walferdin, divided in 0.01 C., see Fig. 55,146 



55.148. Platinum Tetrahedron, according to market value; about 8 10 g platinum tetrahedron is necessary, 

 see Fig. 55,146 



55,148 a. Reduction Table for Gas Volumes measured wet, after Friedr. C. G. Miiller (Ztschr. 

 f. d. phys. u. chem. U., 23, 1910, p. 354), magnified five-fold 



s. d. 



0. is. o 

 2. o. o 



1. 10. o 



0. 15. 



1. 5. 



1. 4. 



1. 0. 



0. 6. 



1. 10. 



Price 

 on appli- 

 cation 



1. 8. 



Cl. 1829, 1830. 



