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BAIRD &L TATLOCKL (LONDON) LTD. 



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3720 3721 



3720 T Hand Compressing Pump. Fleuss' patent. 



This is somewhat on the same principle as the vacuum pump, and is equally frictionless and efficient. The 

 illustration is a single barrel (or one stage) hand pump, if in. by 6 in., for compressing air or other gases 

 up to 1,200 pounds per square inch. The sealing liquid or lubricant for the pump varies according to the 

 gas it is required to compress. For instance, a liquid which is suitable for compressing oxygen, might be totally 

 unsuitable for compressing carbon dioxide, and in ordering, it is necessary for us to know what gases are to be 

 compressed. Like the vacuum pumps, an exact cylinder full of air or gas is delivered at every revolution. These 

 pumps can, of course, be power driven. 



All compression pumps are fitted with a water jacket and pressure gauge. 



For special requirements, we have made combined pumps to compress air up to 400 pounds per square inch 

 and at the same time to pump a vacuum of within a millimetre. 



For higher pressures, pumps can be made in two or more stages. 



Price 



3721 1 Air Pump, Geryk patent, duplex, No; i, price as illustrated 



Specially designed for the rapid production of very high vacua. This pump has 2-in. cylinders by 5-in. 

 stroke. It has been used and tested by well-known scientists, who have found it invaluable. The vacuum 

 obtained is comparable with that given by a Sprengel pump, and the exhaustion of the air is of course infinitely 

 more rapid. Vacuum obtained suitable for exhausting incandescent lamps and Rontgen tubes. 



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CROSS STREET HATTOTST GARDETST, E-C 



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