BAIR-D &TATLOCK (LONDON) LTD. 



3722 3728-3731 



5722 T Air Pump, Geryk, to be driven by power or by hand. 



A. B. C. 



Cylinders . . . . . . . . 5 by 2 5 by 2.\ 7 by 3 in. 



Price . . . . . . . . 21 26 50 42 



5723 T Special Vacuum Stopcock fitted with screw plug for regulating admission of air, extra 



A. B. C. 



16/- 211- 26,6 



5724 1 Oil for Geryk Air Pumps 



per pint tin 023 



Rotary Pressure and Vacuum Pumps, for incandescent lamp factories, distillation in 

 vacua, chemical and physical laboratories. 



These pumps are constructed to produce the greatest obtainable vacua when passing a large volume of 

 ;as, and for this purpose have replaced a great number of complicated reciprocating pumps in lamp factories. 

 They are capable of continuously maintaining a vacuum of less than one-fifth of a millimetre or one-hundredth oJ 

 in inch absolute, and of compressing air to 50 Ibs. per square inch. They are specially suitable for all operations, 

 >ither rough or very refined, and are used in many of the principal laboratories in this country. They are self- 

 ubricating, free from leakage or breakdown, even when subjected to rough treatment, and can be supplied 

 lirect-couplod to electric motor. 



$728 T Size o. Speed, 800 revs, per minute ; capacity, 7 cubic ft. per minute ; horse-power, i . . 



S729 1 Size I 600 14 2 . . 



1730 T Size 2 ,, 500 ,, 27 4 . . 



731 1 Size 3 ,, 400 ,, 42 6 . . 



30 

 43 10 

 54 

 65 



(CHEMICAL AND SCIENTIFIC APPARATUS AND PURE CHEMICALS. 



709 



