TABLE LXV (continued). 



Thermometer No. -1120-4 



29110 



41203 



erect bulb loii'. 



inverted bulb Jii(/Ji. 



in dummy pendulum bulb 



In this Table, the reading of each thermometer is given and the change Afl in 

 the thermometer reading during the swing of a single pendulum. From these figures 

 are calculated the difference between the thermometer reading in the dummy pendulum 

 (No. 41203) and the mean of all three=C. For convenience of calculation the observa- 

 tions are rneaned for the three swings constituting a set. A formula has been assumed 



to hold between the difference C, the mean change in temperature ( == K x -=- J during 

 the observation of a set (each of duration 40 mins.), and the mean difference between 



* 



the reading of the upper and lower thermometers == K 2 ' 



The simple relation is 



2 jj 



ah 



. . 



at 



By the usual method, the observational and normal equations are formed, leading 

 to the most probable values A=0-214 and B=0-532. C is positive when the mean 

 of all three thermometers is greater than the temperature registered in the dummy 

 pendulum. 



The comparison of the calculated and observed values of C are given below : 



81 



