COMPRESSED AIR 253 



I A pneumatic motor is used by manufacturers of pool 



tables in operating a saw for sawing out pockets. One of 

 these pockets can be finished in 30 seconds by the use of a 

 motor, whereas it takes 12 minutes to accomplish the same 

 work by hand. 



There are many other applications of compressed air, 

 but we believe we have cited a few that are not generally 

 known. 



In conclusion it must suffice to say that but for the 

 pneumatic tools such stupendous public and private works 

 as we are witnessing every day, viz. : the Chicago drainage 

 _ canal, wheel pit extension for the Niagara Falls Power com- 

 f pany, New York rapid transit subway, Panama canal and 

 the mammoth hotels and office structures of steel rising all 

 over the country, would perhaps never have been under- 

 taken, and, hence, we may maintain that the changes in all 

 mechanical trades are so great as to be termed revolutionary. 



I 



