54. REPORTS ON THE STATE OF SCIENCE.—1914., 
investigation, not only were the above five earthquakes used, but also 
five others in 1911 as follows :— 
— Date Adopted Epicentre | Adopted Time 
é 3 hi ai. 8 
IE - 3 ; 1911, July 4 39-0N., 714E. 13 33 33 
ing, : ie oe 1911, July 12 27-0 N., 116-0 E. | 4 9 7 
Il. : ; : 1911, Aug. 16 19-08.,1400E. | 22 38 51 
IV. : ; . 1911, Oct. 14 33:5.N., 82:5 E. 23 «24 1 
We : : : 1911, Dec. 16 12-0 N., 101-8 W. 19° aS or 
For these earthquakes Pulkovo epicentre determinations were not 
available, but the results from Galitzin instruments at Eskdalemuir are 
published in the ‘ Geophysical Journal,’ and have been adopted for 
use. The computations were kindly made by Mr. A. E. Young, 
formerly Deputy Surveyor-General of the Malay Survey, who is at 
present working at the Oxford University Observatory; and in this 
instance greater care was taken, Mr. Young calculating the distances 
trigonometrically (instead of reading them from a globe) and using 
the times and tables to seconds of time in the computations, though 
in giving the results the unit 0'lm. has been considered sufficient. 
V.—Comparison of Films for 1911. 
The chief object in using this additional material was as follows. 
It was thought that some of the errors of the Milne instruments might 
be due to faulty readings of the records, susceptible of correction. To 
test the general accuracy of such readings the different stations were 
invited to send their films for the year 1911 to Shide, and many 
of them have responded. Some had bound up their films in such a 
way that transmission was undesirable; but films for 1911 have been 
received at Shide from Cape Town, Cork, Toronto, San Fernando, 
Sydney, Helwan (Egypt), Victoria, Ascension, Perth, Seychelles, 
Eskdale, Guildford, and Colombo, and have been systematically 
examined at Shide by Mr. Burgess and Mr. Pring, who have had 
much experience in reading the Shide films. It was thought advisable 
to make this examination quite independently, before knowing 
whether the revised readings would suit the calculated facts better; and 
indeed the calculations were made at Oxford, so that the Shide readings 
were made in ignorance of the tabular result either before or after. 
On comparing the old and new readings with expectation, it does not 
appear that the new afford any systematic improvement on the old. 
The actual figures for the above five earthquakes are as follows (the 
quantities given being differences from expectation, calculated as already 
indicated). They apply entirely to the phase P, the phase 5 being 
seldom read from the Milne records. 
