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THE SCIENTIFIC PAPERS OF 



inch in the different experiments, the results of which are given in 

 the following Table II. : 



TABLE II. 



EXPERIMENTS WITH STEA'M-JET BLOWEK COMPRESSING AIR INTO 

 A CLOSED VESSEL. 



At the end of the fourth minute the stop-cock was closed, shutting 

 off the steam-jet blower, and at the same time the condensing water 

 was shut off ; it will be seen that the pressure in the vessel then 

 fell slightly, owing to the condensation of the small residue of the 

 steam from the jet. In the third experiment, in which no con- 

 densing water was used, the fall of pressure was more considerable, 

 and the final temperature of the air in the vessel was higher. The 

 steam pressure in the boiler was 50 Ibs. per square inch. 



The following are some of the applications which have already 

 been made or are in course of being made of this improved form of 

 steam jet. 



PNEUMATIC DESPATCH TUBES. First, to the working of pneu- 

 matic despatch tubes. For this purpose the steam jet has a great 



