48 



REPORT — 190L 



Proceeding in this manner, we find that out of the eleven earthquakes 

 considered, the number of commencements which may approximate to 

 correctness are as follows : — Kew, 8 ; Edinburgh, 8 ; Shide, 6 ; Bidston, 4. 



In considering these results it must be remembered that the earth- 

 quakes considered are for the most part small, and the difficulty of accu- 

 rately analysing a small seismogram is greater than when analysing one 

 tiiat is large. 



Amplitudes. — For seven earthquakes the sum of the amplitudes of 

 motion reckoned in millimetres at the four stations are as follows : — 

 Shide, 17-3 ; Bidston, 14'7 ; Edinburgh, 12-8; Kew, 12-1. Assuming 

 that these displacements represent tiltings, which is improbable, the 

 results are as follows : — Kew, 9"'8 ; Shide, S"-0 ; Edinburgh, 5"-7 ; 

 Bidston, 5"-l. 



The following four figures are sketches made from seismograms 

 obtained on the specified dates at Kew, Shide, Bidston, and Edinburgh. 

 The figures following the letter S indicate the number of millimetres 

 equivalent to one hour : — 



4>35? 



Fig. 1. January 18, 1901. 



A 



g[^'au-w;B> iii( ij>j ^ 



Shide. S=58-5. 



4.S6.8 



J. 



6.21.6 



A 



— ... — H9<»'.'iii|«aji!j!i5j4iiiv^w>,t^ 



Kew. S=GC-25. 



4.5G.G 



-*'"0''"'*'"i}»<y**-"-~^ 



Eiastou S =58-25. 



4.57.2 



5.15.5 



Ediubui-gb. S=59. 



