228 



Domestic Science 



of air is drawn through the apparatus, by regulating 

 the outflow of water from the stopcock, so that the 



M 



-* K_ 



Fig. 72. 



A = aspirator nearly full of water. 

 K, K, K,K,K= tight-fitting corks. 



K f = cork on which candle is fixed, cut as shown in small 



plan below diagram. 

 C = short piece of candle. 

 G, G,G,G = glass connections 

 J, J = rubber connections. 



T = glass stopcock. 



PD = glass U-tube containing short sticks of caustic potash 

 in the limb P, and small lumps of calcium chloride 

 in D. 



L = loose-fitting plug of glass-wool. 

 M = lamp-chimney. 

 R = retort stand. 



(Note* Greater efficiency results if the aspirator is replaced by a good 

 water-pump, should this be available.) 



candle burns freely and, as far as possible, without 

 smoking. The products of combustion, being gaseous, 



