THE SCREW COMPRESSOR. 



Scale 1 in ^ 6 inches. 



Fig- 1- — Longitndinal section of the screw compressor, showing the barrel, screw, and 



lever. Scale J. 

 Fig- 2 — End elevation, showing shaft of screw. 



Fig. 3. — Longitudinal section of the lever and ratchet wheel. Scale J. 

 Fig- 4. — Cross section of the screw compressor, showing the gauge and the oil supply in 



longitudinal section. Scale |. 

 Fig. 5 — Longitudinal section of the piezometer tube and the vapor bath. Scale J. 



Fig. 6. — Chart showing the bow-shaped cycles obtained in the gauge comparisons. 

 Fig. 7. — Direct reading, spiral Bourdon gauge. Scale J- 

 Fig. 8. — Chart showing the action of the same. 



Fig. 9. — Longitudinal section of the improved stuffing box for high pressure compres- 

 sion. Scale ^. 

 Fig. 10. — Cross section of the barrel showing the ring. Scale ^- 



