BAIRD &. TATLOCK (LOM)ON) LTD. 



* 





=BB 



WATER INLET1 



a\a 



3700 



3701 



WATER OUTLET 



3702 



WATER OUTLET 

 3703 



'00 Filter Pump, glass, new form, with tubes for exhausting two vessels, or one vessel and 



connection to gauge. The water supply is connected to tube marked A . . . . 056 



'01 Bourdon Vacuum Gauges, 2j in. diameter, with adapter fitted for indiarabber tubing .. 12 6 



''02 Water Blast Pump, air blast, gauge tube, and water regulating stopcock, bronzed zinc 

 water jacket, brass parts polished and nickel-plated, with dissectable pump, and adjust- 

 able lower cones .... 160 



'03 Water Blast, as above, with metal gauge and silvei -plated scale 



DESCRIPTION OF PUMP. 



The apparatus consists mainly of three parts, the reservoir (A), the pump (B), and the stopcock (K). The nut 

 joins the pump (B) to (A), whilst the tube a a is connected to the water supply pipe. On the top of (A) is the 

 pcock (F) with nozzle for the escape of the compressed air. Stopcock (K) regulates the outlet of the water. 

 side the reservoir an almost complete separation of air from water takes place. 



The apparatus is worked in the following manner : The tube (D) of the pump is screwed into (B) as far as 



ssible, the stopcock (F) closed, (K) opened, and the water turned on. (D) is now screwed down again by turning 



round its axis until the gauge connected with (B) indicates the maximum of suction power. For use as blower, 



; gauge is unscrewed, and stopcock b turned full on, the stopcock (F) opened, and the run of the water so regulated 



means of (K) that it escapes almost free from air, and has a fairly constant level in the cylinder (A). A blast of 



equal to 22 centimetres mercury pressure is thus obtained under a water pressure of 2 to 3 atmospheres. On 



sing water supply tap, to prevent any water being forced up, tap {K\ must be closed gently. With water pressure 



2 to 3 atmospheres and a supply of water of 9 to 10 litres per minute, the apparatus sucks up to to 20 litres 



( air, and gives in a short time almost a vacuum. 



220 



(CHEMICAL AND SCIENTIFIC APPARATUS AND PURE CHEMICALS- 



703 



