44 



A. DAIGGER & COMPANY, CHICAGO, U. S. A. 



1591 



1593 



1591 



BLOWERS, Crpwell's Positive Pressure Blower, Adapted to all purposes re- 

 quiring air under pressure of from one to ten pounds per square 

 inch, or for any degree of vacuum not exceeding twenty-four 

 inches. The action is very simple but positive even at lowest speed. 

 For well regulated delivery an air reservoir is recommended. 



DETAILS OF CROWELL TYPE A BLOWERS 



1593 BLOWERS, Crowell's Rotary Compressor or Vacuum Pump, Type "D." The 



Crowell Type "D" Rotary Air Compressors are manufactured in 

 nine standard sizes of from four to three hundred and ninety cubic 

 feet free air per minute capacities and are designed for a working 

 pressure of twenty-five pounds or less per square inch. When usec* 

 as Vacuum Pumps, all sizes of this type will, under permissible 

 atmospheric conditions, exhaust to a vacuum of from twenty-nine 

 to thirty inches (mercury column). The action is simple, positive 

 and durable with a continuous intake and delivery of the air. No 

 valves, springs, gears or unbalanced parts are used or required in 

 the construction. The pressure or degree of vacuum is not de- 

 pendent upon high operating speeds and as no special foundation or 

 great amount of floor space is required, the installation and onera- 



With Oil Box 



1594 



Without Oil Box 



