PHYSICAL PARADOXES. 



on the whole, it will be best to select for this 

 experiment an afternoon when the powers are 

 having a day's shopping. 



It may be arranged as shown in Fig. 38. A 

 piece of wood has a small hole or pit made in it, 

 and this pit is filled with a few drops of water. 

 In the water in the pit is placed a thimble, 

 which is nearly filled with ether. (A penny- 

 worth of methylated ether will suffice for 



FIG. 38. COOLING DUE TO RAPID VAPORISATION OF ETHER. 



several repetitions of the experiment.) The 

 bellows part of a spray-bottle arrangement is 

 taken, and a piece of glass or other tube with a 

 fine orifice is inserted in the end of the tube. 

 (If the experimenter be young and breath plen- 

 tiful, the bellows can be dispensed with.) As 

 the ether is to be blown upon, a perforated 

 shield of thin rubber sheet or other material 

 fitted round the top of the thimble will prevent 

 it from splashing over freely into the water. 



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