ON SEISMOLOGICAL INVESTIGATION. 129 



Seismological Investigations. — Second Report of the Gommittee, con- 

 sisting of Mr. Gr. J. Symons {Chairman), Dr. C. Davison and 

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

 Adams, Dr. J. T. Bottomley, Sir F. J. Bramwell, Professor 

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

 Deacon, Professor J. A. Ewing, Professor C. G. Knott, Professor 

 G. A. Lebour, Professor R. Meldola, Professor J. Perry, 

 Professor J. H, Poynting, and Dr. Isaac Roberts. 



Contents. 



PACiB 



I. Report of Work done for the estahlighment of a Seismic Survey of the 



World, drawn lip by JOH.y Miiji^E, F.B.S., F.G.S. . . . .129 



II. Records of the Oray- Milne Seismograph. 5// John MiLNE, F.R.S., F.6.S. 132 

 III. Installation and working of Milne's Horizontal Pendulum. By John 



Ui\,T<i^, F.R.S.. F.G.S. 137 



rV. Observations at Carisbrooke Castle and Shide. By John Milne, F.R.S., 



F.G.S. 146 



Carisbrooke Records . . . . . . . . . .146 



Earthquakes at Shide 149 



V. Earthquake Records from Japan and other j)laces. By John Milne, 



F.R.S., F.G.S. 153 



VI. Highest apparent Velocities at which Earth-waves are propagated. By 



John Milne, P.R.S., F.G.S. 172 



VII. Diurnal Waves. By Johj<! M.ihi'iE, F.R.S., F.G.S. . . . .176 



VIII. The Perry Tromometer. By John Milne, F.R.S., F.G.S. . . .181 



IX. Sub-oceanic CJtanges. By jojrn MihifS, F.R.S., F.G.S. . . . 181 



Brady seismic Action . . . . . . . . . .182 



Sedimentation and Erosion . . 187 



Causes resulting in the yielding of Submarine Banks . . . .188 



Cable Fracture 189 



Cmiclusions and Suggestions for a Seismic Survey of the World . . 204 



I. Report of Work done for the establishment of a Seismic Survey of the World. 

 Professor Milne has reported to the Committee that on January 31, 

 1895, he had issued a circular calling attention to the desirability of 

 observing earthquake waves which had travelled great distances, with 

 working drawings of the necessary installations. 



Some months later Dr. E. von Rebeur-Paschwitz drew up suggestions 

 for the establishment of an international system of earthquake stations. 

 To this scheme Professor Milne and other members of the Committee lent 

 their names. 



After the death of von Rebeur these suggestions were translated into 

 French and issued by Dr. G. Gerland of Strassburg, on his own respon- 

 sibility. 



For this reason, but more especially because individual efforts have not 

 led to any definite results, the Committee have issued a letter to a number 

 of observatories requesting co-operation in the observation of earthquakes 

 which are propagated round and possibly through the earth. 



Dr. Michie Smith has informed Professor Milne of the co-operation 

 which might be expected from the Government of Madras. The Kew 

 Committee have decided to establish an instrument. 



Mr. Oldham, Director of the Geological Survey of India, has evinced a 

 desire to assist in making observations. It is likely that Professor Turner 

 of Oxford will purchase a seismograph, whilst others have made inquiries 

 respecting the necessary installation. Sir Clement Markham has already 

 offered his hearty support in carrying out a seismic survey of the world, 

 1897. K 



