pressure at which observations of time ol swing were made. These are put down 

 below : 



The analysis of the pendulum observations follows in Tables Nos. LV and LVI. 



TABLE LVI. 



For an estimate of the probable error of the results, Table LVI I is next formed. 



TABLE LVIT. 



From which the probable error of a single result 



e- 3 -- 8-5X10 7 sec. 

 e 7 =3-9 

 e 21 = 5-3 

 = 1-6 



Ps 

 Pi 

 Pn 



Pm 



3-5X10- 7 sec. 



1-6 



2-2 



U-G5 



75 



