6?>$ 



Mr. Ellis Williams on the Influence of 



vessel was a little more than a cubic metre, and its rate of 

 change o£ temperature, due to fluctuations in the temperature 

 of the room, never exceeded y J> o° CJ. per hour. By measuring 

 the rate of change before and after each experiment, the 

 temperature could be judged with considerable certainty to 



3 00 ^ 



A number of preliminary experiments were made in order 

 to ascertain the change of temperature occurring on the 

 application of pressure and the time taken by the cylinder to 

 attain the temperature of the bath. The curve (fig. 2) shows 



Fk. 2. 



3' -5 



r-o 



l°5 



f-0 



5. 



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V 



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5 





m MlNh 



10 20 30 40 50 



T£MPe/?/ITO/f£ Ch*NC£ /A> CrUA/D£/r 



the effect of the sudden release of a pressure of 400 atmo- 

 spheres. The fall of temperature is about 3°*5, and the 

 time taken to attain the temperature of the bath is from 40 

 to 60 minutes. The temperature in the cylinder was in this 

 case measured by means of a copper-constantan thermo- 

 junction, immersed in a rubber tube full of oil precisely 

 similar to that used with the wire coils. 



