Xo. 55 137. 



Liquefaction of Gases. Gas and Vapour Density. 



613 



55 136. 1 : 6. 



55 137. 1 : 8. 



55.126. Apparatus for the Liquefaction of Gases by Cooling, without the application of pressure, s. A. 

 Figure 0. 10. 



The lower part of the apparatus the small flask is placed in a cold mixture while the lower 

 eduction pipe, which is provided with a U-tube connected to the small flask and is also surrounded 

 by a cold mixture, is traversed by the gas being dealt with. The following are well adapted for this 

 experiment: sulphurous acid, nitrous acid, ammonium cyanide and methyl chloride gas. 



52,656. Piezometer inset with Four Tubes, after Magnus, for the liquefaction of Gases by pres- 

 sure, Fig. 52,656, p. 359 (M. P., Ill, Fig. 306 [II, 2, Fig. 163]) 1.10.0 



Three short syphon barometers are contained in one vessel and can be fed with mercury and 

 various gases above the latter, while the fourth barometer serves as a manometer. 



55.127. Carbonic Acid Gas Tube, appearing vacuous at ordinary temperature; only when 



cooled does some liquid carbon dioxide become visible. In box 0. 18. 



55.128. - - i d e m, with perfectly anhydrous, pure carbonic acid 1. 5. 



55.129. Carbonic Acid Tube with some liquid Carbonic Acid, Figure. At ordinary tempe- 

 rature 2 5 ccm are visible, but when heated with the hand the tube appears empty. 



In small box .' 0.18.0. 



>>. 130. -- idem, with perfectly anhydrous, pure carbonic acid 1. 5. 



55.131. Carbonic Acid Tube, about half-filled with liquid carbonic acid, for shewing the great 

 mobility of the same. In case 0. 18. 



55.132. -- idem, with perfectly anhydrous, pure carbonic acid 1. 8. 



.V>, 133. Carbonic Acid Tube, entirely filled with liquid at 25 C. In case 0.18.0 



55.134. - - i d e m, with perfectly anhydrous, pure carbonic acid 1. 8. 



55.135. Tubes with Liquefied Gases: 



(a) Ammonia .... 0. 12. (e) Carbonic Acid . 0. 18. (i) Sulphurous Acid . 0. 10. 



(b) Chlorine 0.12.0 (f) Nitrosy] Chloride 0.18.0 (j) Sulphuretted Hy- 



(c) Cyanogen .... 0. 18. (g) Phosgene ... 0. 10. drogen 0. 18. 



(d) Carbon Oxysulphide 0.18.0 (h) Muriatic Acid . 0.15.0 (k) Nitrous Oxide . . 0.18.0 



(1) Nitrogen Dioxide 0. 18. 



55.136. Apparatus for Determining Gas and Vapour Densities by Dumas' Method, Figure, 

 by (Iclermining the weight of a definite vapour volume (W. u. E., phys. Prakt., Fig. 56; 

 Chwolson, I, Fig. 225) 1. 6. 



1 Stand, 3 narrow-necked glass Flasks, 1 Thermometer, 1 Stirrer and 1 Wire Triangle. 



55.137. Apparatus for Determining Vapour Density by Gay-Lussae's method, Figure (De- 

 termination of Volume of the Vapour yielded by a given weight of Liquid), complete 

 with stand, graduated tube, thermometer, stirrer and burner, but without mercury 



(M. P., Ill, Fig. 134 [II, 2, Fig. 142]) 3. 15. 



Cl. 1809, 1822, 1810. 



