Some Experiments on the Latent Heat of Steam. 45 



When this alteration had been made experiments with 

 this apparatus also showed the curious result that though 

 the majority gave about 525 as the value of L, agreeing 

 with the results of the earlier work, yet occasionally a result 

 would come much higher, thus pointing to the likelihood 

 of the existence of some undiscovered source of error. 



After much seeking this was at last found to be a 

 defect common to all forms of apparatus where the 

 steam entered the condenser by a vertical pipe, including 

 the method just described and both Berthelot's and the 

 modified form of glass apparatus. The defect was shown 

 by the following experiment. (Fig. 2.) The steam- 

 delivery tube of the electrical boiler was fixed by means of 

 a cork into the mouth of a glass cylinder. The whole of 



