XM. .VJ MOM. 



Stopcock Vacuum Pumps. 



389 



\ 

 52 896. 1:11. 



.">:_'. s<C. Vacuum Pump after Bianchi, with Electric Motor Drive, worm gearing and chain 

 transmission, F i g n r e, with glass barrel, double-acting, with Steel Valves placed 

 outside the barrel, with steel Babinet stopcock, with firm iron stand, Glass Plate 280 mm 

 diameter on special tripod with Barometer Gauge, 300 mm high, firmly attached, 

 No. 50,142, of. Fig. 52,894 on p. 387, connecting tubing screwed at both ends . . . 



Price exclusive of Receivers. Largest Receiver for use with above: No. 53.(>l.~> 



55.0. 



0. (i. (i 



The pump is driven by a '/ 3 r(l II. I'. Direct Current Motor. The following are included in the 

 price: Starting Rheostat, 1 double-pole Switch and 1 Plug Box with plug. When ordering, kindly state 

 kind of current and voltage. If this is not given we supply the motor for a pressure of 110 volts D. ('. 



i, *!)(>. Vacuum Pump aftev Deleuil, Figure, with glass ban-el 90 mm internal diameter 

 and 320 mm height, metal piston with guide passing freely in the cylinder, with Babinet 

 cock, with neat iron stand; can be used for evacuating and compressing; all cocks of 

 steel; Glass Plate 280 mm diameter on special tripod, with Barometer Gauge 300 mm high 



Price exclusive of Receivers. Largest Receiver for use with above: X<>. .>:!.<)].-> 



33.0. (I 



-,*97. Vacuum Pump with 2 Vertical Glass Barrels, Figure, 55 mm internal diameter 

 and 220 mm height; with Glass Plate 250 mm diameter and Barometer Gauge 300 mm 

 high, with steel valves fitted outside the cylinder and with steel Babinet cock; on 

 polished Oak Table 20. o. o 



Price exclusive of Receivers. Largest Receiver for use with above: No. ,">:!. 014 



It is advisable, however, to choose the next smallest. No. 53,013 



VJ.S98. -- idem, on low oak block, Figure 18.0.0 



">2,S!t!i. -- idem, with glass barrels 50 mm internal diameter, 200 mm high, Barometer 



Gauge 200 mm high 15. 0. 



">2.!M>o. Model of a Double Barrel Vacuum Pump, Figure, of wood, pasteboard and metal, 



showing plainly the play of the pistons, valves and rods, with Babinet cock .... 3.0.0 



Cl. 937. 



