Experiments on the Latent Heat of Steam. 47 



thermometer again became regular. The flame was then 

 extinguished, and the worm was detached, corked, carefully 

 wiped, and allowed to remain in the balance-case for some 

 time before weighing. The error on the determination of 

 the weight of the water condensed in the worm could not 

 exceed one part in 10,000. We made a special blank 

 experiment without condensation, to ascertain if the 

 Regnault-Pfaundler corrections were applicable, and found 

 this to be the case. 



We give below the readings of the thermometer during 

 one experiment (No. 1). 



[The first readings given are those taken after the water 

 had been boiling for 20 minutes.] 



Time. 



h. 



m. 



4 



6 



4 



°i 



4 



7 



4 



7i 



4 



8 



4 



81 



4 



9 



4 



9i 



4 



10 



4 



10J 



4 



11 



4 



"i 



4 



12 



4 



"i 



4 



13 



4 



13* 



4 



14 



4 



i4i 



4 



J 5 



4 



151 



4 



16 



4 



16J 



4 



17 



Reading. 



I4'5 2 4 

 I4'532 

 I4*540 

 14*547 

 i4*556 

 i4*5 6 4 

 !4*573 

 14-582 



i4* 77 

 15* ° 2 



15* 20 



i5' 72 

 i5* 97 



Notes. 



Preliminary period. 



Valve opened 4I1. 9' 50". 



Reading missed. 



16" 

 16- 

 16- 

 16- 



22 

 46 

 70 

 93 



iy 18 



i7* 40 

 17- 64 

 17- 86 



