[MCLENNAN & shrum] LIQUEFACTION OF HYDROGEN 



187 



» ot^scmcrtn 



Ti e^iscurm 



HYDROCCN 

 LIQUCnCR 



Fig. 4 



The gas is then expanded from a nozzle and as a result of the regenera- 

 tive cooling the temperature falls below the boiling point and liquid 

 hydrogen is separated out. 



The compressed hydrogen passess successively through the coils 

 Li, Li', Li, L3, L4, and L5, Fig. 4. Li and L/ are arranged in parallel 

 and the valve Z serves to regulate the proportion of gas going through 

 each of them. This insures the proper interchange of heat between the 

 oncoming compressed gas and the out going low pressure vapours. 



The coils Li, L^ and L5 are cooled by gaseous hydrogen returning 

 to the gasometer from the expansion cock C\. LÎ and L3 are cooled 



