394 



Motion of Gaseous Bodies. 



-\;i. .VJ933 



52946. 1:4. 



52949. 1:9. 



52.933. Duplex Vacuum Pump with Oil-packed Piston and oil non-return valve, Kohl's System, 

 C.erman Patent, for Motor Drive, still larger than preceding; internal diameter of Barrels, 

 100 mm; Stroke 220 mm; without Motor or Plate 



The pump exhausts to 0.0014 mm. 



52.934. - - i d e m, with Plate 320 mm diameter and Barometer Gauge 300 mm high . . 



Largest Receiver for use with above: No. 53,016 . .' 



52.935. - - idem, driven by a 3 / 4 H. P. Direct Current Electric Motor for 110 Volts, on 

 table with polished top and iron frame; without Plate, cf. Fig. 52,921, p. 393 . . . 



52.936. - - i d e m, with 220 volt D. C. Motor 



52.937. - - idem, with Plate 320 mm diameter and Barometer Gauge 300 mm high, with 

 110 volt D. C. Motor 



Largest Receiver for use with above: No. 53,016 



52.938. --idem, with 220 volt D. C. Motor 



52.939. Duplex Vacuum Pump with Oil-packed Piston and oil non-return valve, Kohl's system. 

 (Jerman Patent, for Motor Drive, larger than preceding; internal diameter of Hariris. 

 125 mm; Stroke, 250 mm; without Plate, cf. Fig. 52,921, p. 393 



The pump exhausts to 0.0014 mm. 



52.940. - - idem, with Plate 320 mm diameter ;md Barometer Gauge 300 mm high . . 



Largest Receiver for use with above: No. .->3,ll]6 





 40. 



II. 

 0. 



til'. 



66. 



o. 



s. tl. 



(t. 



5. o 



11. 6 



1(1.0 

 5.0 



15. o 



11. is 



117. 10.0 



47.10.0 



52. 941. - - i d e m, driven by a 1 H. P. 110 volt Direct Current Motor; on table with polished 

 top and iron frame, without Plate, cf. Fig. 52;921, p. 393 



52.942. - - idem, with 220 volt D. C. Motor 



52.943. - - idem, with Plate 320 mm diameter and Barometer Gauge 300 mm high; with 

 110 volt D. C. Motor 



Largest Receiver for use with above: No. 5.'5,<Ki 



52.944. idem, with 220 volt D. C. Motor 



51. 



0. 



77. 

 78. 



81. 

 0. 



i:.. o 

 II. (i 



10. (I 



5. o 



15. 



11. r, 



S2. 10. 



Rotary Oil Vacuum Pumps and Enclosed Vacuum Pumps. 



Rotary Oil Vacuum Pump, Fig. ."">!.', 946, with driving wheel, arranged for Hand and Cord Drive: 

 suitable both for teaching and for Laboratories and Incandescent Lamp Factories; can be used 

 specially as a prcliminarv pump for the Pointing Mercury Vacuum Pump. 



Sixe .' ' '....' 1 '2 :; 



I List Nd. 52,945 52.946 52,947 



t Price t 7.0.0 8.0.0 10.0.0 



For Hand and Cord Drive 



Water Air Pumps: see pp. 22 27. 



ci. Mia 





