BAIRD &TATLOCK (LONDON) LTD. 



5087 



5087 s Dr. Adeney's Mercury Pump and Apparatus for the extraction and collection of 

 dissolved gases in water. 



Price complete, mounted on teak stand with brass fittings, nickel-plated 



The pump proper consists of two glass bulbs A and B, of 50 and 20,0 cubic centimetres capacity respectively. A 

 is closed by a Friedrich's two-way stopcock c, by means of which the pump can be connected or disconnected 

 through the branch tubes a and b, with the laboratory flask F, or gas pipette, 150 cubic centimetres capacity, D. 

 The bulb B is constricted and is continued downwards and bent twice at right angles and closed by a Friedrichs' 

 stopcock K, as shown in the diagram. 



The mercury reservoir H is connected by rubber tubing to the pump by means of the side tubulure just below 

 the stopcock K. 



To work the apparatus, the pump and branch tubes are filled with mercury ; the condenser E is fitted in 

 position, as shown. A little distilled water, with or without the addition of a little sulphuric acid, as the experi- 

 ment may require, is put into the flask A and boiled. The flask is then fitted by means of a rubber cork to the 

 lower end of the condenser, and exhausted of air by means of the mercury pump in the ordinary way. When 

 exhausted, the gas pipette D is removed by lowering the support d ; and the end of the branch tube from the 

 pump, thus freed, is dipped under the water to be examined ; 50, 100, or 250 cubic centimetres of the water are 

 drawn into the bulb A and B by lowering the mercury reservoir. The measured volume of water is then allowed 

 to flow into the laboratory flask F, when it is boiled in vacua. 



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