614 



Heat and Change of State. 



No. 55 138 



55138, 55139. 1 : 10. 



55 140. 1 : 10. 



55 141. 1 : 6. 



55,138. Apparatus for Determining Vapour Density by A. W. Hofmann's method (Deter- 

 mining the Volume of Vapour yielded by a given weight of Liquid) see Figure, with 

 barometer tube, steam jacket, mercury bath, steam boiler, burner and small flask with 

 glass stopper, stand and stage (W. u. E. phys. Prakt., Figs. 57 59; M. P., Ill, Fig. 135 

 [II, 2, Fig. 143]); without Mercury or Cooling Vessel 



s. d. 



3. 0. 







55.139. Cooling Vessel for above, see Fig. 55,138, of copper 2. 10. 



55.140. Apparatus for Determining Vapour Density by the Air-displacement method of 

 V. Meyer, Figure, with measuring glass for catching the gas and with water vessel 



(W. u. E. phys. Prakt., Fig. 60), without bracket 1.16.0 



55.141. Effusiometer after Bunsen for Determining Vapour Density by the Efflux Met hud. 

 Figure, with threeway cock and platinum diaphragm (W. u. E. phys. Prakt., Fig. 61 ; 



M. P. I, Fig. 574 [592]), without Mercury 2. 0. 



53,143. -- idem, after Henniger, Fig. 53,143, p. 411 1. 6. 



Cl. 1811, 1812, 1813. 



