ON SEISMOLOGICAL INVESTIGATION. 179 



Seismological Investigations. — Tliird Report of the Committee, con- 

 sisting of Mr. G. J. Symons (GJiairman), Dr. C. Davison cmd 

 Mr. John Milne (Secretaries), Lord Kelvin, Professor W. G. 

 Adams, Professor T. G. Bonney, Dr. J. T. Bottomley, Mr. 

 0. V. Boys, Sir F. J. Bramwell, Mr. M. Walton Brown, Pro- 

 fessor G. H. Darwin, Mr. Horace Darwin, Major L. Darwin, 

 Mr. G. F. Deacon, Dr. G, M. Dawson, Professor J. A. Ewing, 

 Professor 0. G. Knott, Professor G. A. Lebour, Professor E. 

 Meldola, Professor J. Perry, Professor J. H. Poynting, Dr. 

 Isaac Eoberts, and Professor H. H. Turner. Draivn up by 

 Secretary, John Milne. 



Contents. 



PAGE 



I. Progress made inwards the Estahlishment of Eartliqualie-olsening 



Stations round the World, ^y John Milne 179 



II. Notes on Special Earthqxiahes. By John Milne 185 



III. Catalofjiie of Earthqualxs recorded in Toldo, Beceiriber 17, 1896, to 



Dec'emher 16, 1897 189 



IV. Earthquahes recorded at Shide {Isle of Wight), Edinhurgh, Eidstone, and 



certain Stations in Europe, roith Discussion on the same. By John 



Milne 191 



V. On Certain Characteristics of Earthqualte Motion. -By John Milne .218 



VI. Magnetometer Disturbances and EarthquaJies. By John Milne . . 226 



VII. Suboceanic Changes in Relation to Earthqualtes. By John Milne . . 251 



VIII. A Time Indicator. By John Milne 255 



IX. On tlie Civil Time employed Throughout the World. By John Milne . 255 



X. Great Circle Distances and Chords of the Earth. By John Milne , , 256 



XI. Certain Small Fractions of an Hour. By Shinobu Hieota . . . 257 



XII. Earthquake Observations in Italy and Europe. By John Milne . . 258 



XIII. Preliminary Examination of Photograms obtained with the Seismometer 



in the Liverpool Observatory. By W. E. Plummee .... 272 

 XIV. A List of Reports relating to Earthquakes, j^ublished by the British 



Association 276 



I. Progress made toivards the Establishment of Earthquake-observing 

 Stations in various Parts of the World. 



In the report for 1897 there will be found a copy of a circular inviting 

 cooperation in the establishment of a seismic survey of the world, which, 

 with the kind assistance of the Foreign, Colonial, and India Offices, was 

 forwarded to many countries and colonies. The result of these communi- 

 cations, together with private correspondence, has been to establish or 

 arrange for the establishment of instruments at twenty-two stations. 



The following notes indicate the position we hold in regard to these 

 stations, and the direction in which further co-operation may be expected. 



The instruments at Shide, in the Isle of Wight, are indicated as Nos. 1 

 and 2, but it is only No. 1 that is of the type recommended by this com- 

 mittee. No. 2 consists of a pair of horizontal pendulums writing on 

 smoked paper. Both were purchased by Government grants from the 

 Royal Society. 



n2 



