High Vacuum Pumps with Oil Packing, Kohl's System. Rotary Enclosed Vacuum Pumps. 



395 



52955. 1 : 15. 



52962. 1 : 15. 



Size 



Power required at 160 130 r. p. m. 



V. 



. .approx. H. P. 



With 110 volt Direct Current Motor, on board with [ List No. 52,948 52,949 

 (hiving cord, switch, starter, connecting lead] 



4 m long, plug and plug-box ( Price 15. 0. 16. 0. 



With 220 volt Direct Current Motor, Accessories as ( List No. 52,951 52,952 



above \ Price 15. 10. 16. 10. 



3 



Va 

 52,950 



19. 0. 



52,953 

 19. 10. 



Rotary Enclosed Vacuum Pumps: can be used as Vacuum Pumps or Compressors, Figs. 52.955 

 and 52,962. 



These Rotary Pumps, Figs. 52,955 and 52,i)(>2, are specially suited for Laboratory use. They have no dead 

 space and can thus produce high vacua even to pressures of 1.5 mm mercury column: ihe Pumps can also be 

 used as Compressors and employed thus they give 1.2 2 atm. over-pressure. When employing the Pumpfl as Com- 

 pressors a correspondingly greater driving force is necessary if the Pumps are to be used to full advantage (see 

 Table). 



The Vacuum Pumps are supplied with (Ml BOY. Fig. 52,9,V>; by placing the Pumps under oil they are 

 cooled better and good packing and lubrication are obtained. 



Pumps Nos. 52,956, 52,957, 52,961 and n2,9<>;> have Water Cooling for the rotary part and the side part: 

 in the case of Nos. 52,955 and 52,960 this Cooling is only extended to the lateral parts. 



The data regarding the quantity of air absorbed only apply when the air has a free passage and with maximum 

 speed of Pump: witli lower speed the quantity of air absorbed decreases as the speed. 



Cl. 3660.5903. 



