252 W. 0. DUNTLEY 



and the other simply controlling the pneumatic engine, 

 while both assist in moving the engine and blade from frame 

 to frame. 



Where it is desirable to employ a number of these saws 

 an air compressor transported by means of an ordinary drag 

 attached to the engine is preferable, admitting of the opera- 

 tion of the compressor independent of the engine, and with 

 a plant of this character a number of saws can be operated 

 with very satisfactory results. 



The distance from the base of air supply at which the 

 saw can be operated is limited only by the amount of piping 

 available and it is claimed that from 20 to 30 acres can be 

 cleared with this device without moving the base of air supply. 



Pneumatic hammers are extensively used for cutting 

 hitches in mines for timbering up shafts. 



Pneumatic hoists are used for transporting, loading and 

 unloading lumber to and from ships. 



Jam riveters are used quite extensively for cleaning crown 

 sheets of locomotives. 



One man in Australia writes that he has accomplished 

 the same work with a portable pneumatic drill that hereto- 

 fore it was considered could only be done with the radial drill. 



One of the latest applications of air is for street sweeping. 

 This is accomplished by two steel tanks on a wagon, the larger 

 for water and smaller containing compressed air. When 

 the driver moves a lever the nozzles beneath the wagon are 

 opened and, driven by compressed air, the water rushes out 

 on either side, sweeping all the dirt to the gutters. The force 

 of water is regulated by the driver and the space cleaned 

 is from 30 to 40 feet on each side. One supply of air is suffi- 

 cient for several tanks of water. There is practically nothing 

 to wear out, the first cost being much less than the revolving 

 broom wagons, and the expense of compressing the air is 

 comparatively small. 



Coal boring by a portable pneumatic drill is being suc- 

 cessfully accomplished. The only change necessary is the 

 removal of feed screw and application of breastplate. One 

 of our correspondents writes that he can drill a two inch hole 

 six feet deep in three quarters of a minute. 



