294 MIDDLEMISS : KANGRA EARTHQUAKE. 



This should give an indication of the correctness or otherwise of the assumed 

 chronometer errors. 



(2) Before tabulating the results of the measurements of the magnetograms 

 and comparing them as above suggested, it would be well to 



etnods 01 b r j e fly indicate the methods of obtaining correct time at the 

 obtaining tune J ° 



at the various various observatories, 

 observatories. 



At Dehra Dun time is obtained by comparison of the observer's chronometer 

 with the sidereal clock at least twice a week, errors on the days being interpolat- 

 ed by the rates thus obtained. 



At Barrackporc and Toungoo time is obtained by observations to E: and 

 W. stars. 



At Kodaikanal time is obtained by telegraphic signal from Madras daily 

 and the observer's chronometer is compared daily with the Solar Physics observa- 

 tory clock. At all observatories the driving clock of the magnetographs is 

 compared daily with the standard chronometer by means of a pocket chronome- 

 ter, but as before stated in the absence of a second hand on the driving clock this 

 determination is likely to be in error some seconds. 



Times of Principal shock measured from magnetographs. 



i.— Direct measurement of time of shock corrected for errors of clock, 'parallax 



and cut off. 



[All in Madras time. H from H.F. curve 8 from declination curve.] 



Thomas. Mazumdar. Omori, 



Dehra Dun. (H) 6-11-43 -) 6-11-29*) 6-11-27 



L) 6-11-43 ) 6-11-29*) 6-11-27-) 



[6-11-46 [ 6-11-37 V6-11 



) 6-11-48J 6-11-46J 6-11-33) 



30 



Mean. 6-11-38. 



(H) 6-1 6-12 -) 6-16-26) 646-29) 



> 6-16-39 > 6-16-38 £ 6-16-43 



(^ 6-17-5 J 6-16-50 ) 6-16-55 J 



Mean. 6-16-41. 



Kodaikanal. (Hi 6-21 -40 i 6-21-37") 6-21-30") 



U-21-52 [ 6-22-7 [ 6-22-0 



(o) 6-22-4 ) 0-22-36 ) 6-22-30 ) 



Mean. 6-22-0. The Kodaikanal H.F. trace is very faint and diffi- 

 cult to measure. 

 Toungoo. (H) 6-20-3. 6-19-45 6-19-58 



(S) Very faint not measured. 

 Mean. 0-19-55. 



