Xo. .v.r.it 



Water Air Pumps and Water Jet Blowers. 



23 





50127. 1:14. 



50128. 1:14. 



If in this ease the Physics Room is not high enough above ground level, the pump should be 

 erected in a higher storey. In case a water supply pipe is not laid on, it can also be fed from a water 

 tank placed in the uppermost storey of the building. 



50.127. Water Air Pump and Water Jet Blower, combined on a board (Figure) consisting s. d. 

 of water air pump Xo. 50,120 (with canvas sack and Metal Vacuum Gauge) and Blower 



Xo. 50,144, with a screw down tap each for the pump and blower 6. 0. 



The board is 200 cm high and 48 cm wide. For this apparatus fitted with refuse trap, see Xo. 50,165. 

 In erecting it is only necessary to connect the suction and pressure leads with the leads on 



the lecture bench and to connect the water lead with the water waste pipe. 



50.128. - The preceding, the air pump fitted with mercury manometer (F i g u r e). 



Price, without the mercury for charging 5. 10. 



In the illustration this pump is shown without water tank, the construction being very compact 

 when available space is limited. 



The board is 200 cm high and 35 cm wide. 



50.129. Water Air Pump (as suggested by A r z b e r g e r and Z u 1 k o w s k y) with water 

 bag (see also X">. ."iti.127 and .10.128), made of metal, nickelled, with glass cock, on po- 

 lished oak board, with metal Vacuum Gauge of 100 mm scale-diameter, exhausting to 

 a moderate degree at 10 m water-pressure (1 atmosphere), and to 20 mm mercury column 



at higher water-pressure (W. D., Fig. 16) 2.15.0 



The water bag obviates the forcing of water into the air lead or the pressure gauge when the 

 cock is inadvertently placed in the wrong position or when the water is suddenly released. 



At a pressure of 3 atmospheres these water air pumps exhaust a receiver of 2.3 litres capacity 

 to 18 mm mercury column in 10 minutes. 



233T-. 2336. 3190. L189. 



