From (b) and (c) we find that 



(1) " E " was losing on sidereal time 236-46 sec. daily. 



(2) 236-30 } (d) 



(3) 236-38 



We may therefore take it that " E " chronometer was probably keeping a fairly steady 

 rate. 



Further, from a consideration of the vahies of " S.C." " E " at the five chosen 

 periods of the day, we find that " S.C." changed its rate (" E " assumed constant) 

 between the a.m. and p.m. sights on July 14th, and again between the p.m. sights of 

 July 15th and the a.m. sights of the 16th. Thus, we apply the correction 0-14 sec. 

 losing to the first three pendulum observations, 0-49 sec. losing to the next three, and 

 0-23 sec. losing to the last observation only. 



The comparison of " S.C." with the mean time chronometers was carried out by 

 the help of the coincidence apparatus. At the coincidence between the beat of the 

 chronometer and that of the coincidence apparatus, the corresponding times of " S.C." 

 and " E " were simply noted. 



PENDULUM OBSERVATIONS, JULY 12TH TO 16TH, 1912. 



Determination of Flexure Correction. 

 The observations for flexure were made 3| times and gave the following results 



Nos. 5 and 7. No. 21. 



25-lXlO- 7 sec. 



24-4 35-OX10- 7 sec. 



22-9 32-0 



25-1 33-1 



mean 24-40-35 mean 33-3 + 0-59 



The Barometer Correction was calculated from the corrected readings of No. 1157. 



For the humidity correction, a pair of wet and dry bulb thermometers were used. 



Temperature Correction. Thermometer No. 41203 was used in the dummy pendulum 

 and the appropriate corrections applied. 



In this and the succeeding series, 20 coincidences were observed each time instead 

 of the usual 10. 



The analysis of the results is given in Table XXXIII, and in Table XXXIV are 

 summarized the results by the individual pendulums. 



50 



