146 



Lieut.-Gen. R. Strachey. 



[Dec. 13, 



respectively, or of the times of travelling round the earth, which are 

 shown in Table III, for all the stations except Toronto. 



Table III. 



Place. 



Intervals occupied in travelling round the earth 



From east to west. 



From west to east. 



I to III. 



III to Y. 



Yto VII. 



Mean. 



II tolY. 



IV to VI. 



Mean. 



Stonyhurst .... 



Kew 



Grreenwieh .... 



St. Petersburgh 



Mean excluding 

 Toronto . . 



h. m. 



36 40 



37 10 

 37 

 37 5 

 37 5 

 37 10 

 37 

 36 45 



36 45 



37 25 

 37 15 



h. m. 



Of 



37" 5 



37 3* 

 37 

 37 15 

 36 50 

 36 55* 



36 45 

 36 10 



h. m. 



DO OU 



36*45 

 37 3* 



36 25 



36* 55* 



h. m. 



OO O/ 



36 40 



37 

 37 2 

 37 3 



36 55 



37 

 36 57 



36 45 



37 5 

 36 43 



h. m. 



OO OO 



35 45 

 35 30 

 35 15 

 35 20 

 35 35 

 35 25 

 35 15 



35 20 

 35 10 

 35 10 



h. m. 



o4< 



34 5 



35 30 

 35 10 



35 5 



36 

 35 30 



35 45 



h. m. 



35 45 



34 48 



35 22 

 35 15 

 35 20 

 35 43 

 35 23 



35 20 

 35 28 

 35 10 



37 4 



36 54 



36 48 



36 57 



35 24 



35 9 



35 17 



* At these stations the fifth transit cannot be traced. 



From the results thus obtained it would follow that the wave 

 travelled round the earth from east to west in 36 h. 57 m., being at the 

 rate of '1026 hour for one degree of a great circle of the earth, and 

 from west to east in 35 h. 17 m., being at the rate of "098 hour for one 

 degree. From the velocities thus determined the probable time of 

 the origin of the wave has been calculated from the known distance 

 of each place from Krakatoa, the time occupied in the passage of the 

 wave from Krakatoa to the place of observation, and the observed 

 time of the passage of the waves. 



The mean value thus obtained from the waves moving from east to 

 west for the time of the origin of the disturbance at Krakatoa is 

 2 - 52 h. Greenwich mean time, or 9'53 h. local time, that is 9 h. 32 m. 

 a.m. of the 27th August. 



In like manner the waves travelling from west to east will give the 

 following results (Table V) : — 



The mean value of the time of the origin of the disturbance 

 obtained from the waves moving from west to east is therefore 2'20 h. 

 Greenwich mean time, or 9*21 h. local time, that is 9 h. 13 m. local 

 time. 



