160 REPORT— 1890. 
peut obtenir, mais ce sera suffisant. Si rapide que soit le refroidissement, 
le fer reste dans la région ot la transformation moléculaire est possible 
pendant un temps qui n’est jamais nul. 
P. 156 (en bas).—Ces considérations et celles de Mr. Tomlinson sont 
analogues a celles que j’ai rapidement indiquées de mon coté et me parais- 
sent justes. 
Tenth Report of the Committee, consisting of Sir WILLIAM THOMSON, 
Mr. R. ErHeripGe, Professor JoHN Perry, Dr. HENRY Woop- 
warD, Professor THoMas GRAY, and Professor JOHN MILNE 
(Secretary), appointed for the purpose of investigating the 
Earthquake and Volcanic Phenomena of Japan. (Drawn up 
by the Secretary.) 
In consequence of the Secretary’s absence from Japan during the greater 
portion of the past year, the opportunities for original investigation have 
aot been so great as in previous years. 
Tue Gray-Mitne SEIsMOGRAPH. 
The first of the Gray-Milne seismographs constructed in 1883, partly 
at the expense of the British Association, still continues to be used as the 
standard instrument. The earthquakes which it has recorded since 
March 4 of last year are given in the following list. 
Catalogue of Earthquakes recorded at the Meteorological Observatory, Tokio, between 
March 18, 1889, and April 27, 1890, by the Gray-Milne Seismograph. 
ne aia Double 
No. Month | Date Time Duration Direction Period 1 Amplitude 
seconds 3 
in mm. 
1889. 
H. M. 8. M. S. 
905 III. 18 6 41 12 AM. —_ N.-S _ _ 
906 : 21 6 9 23 P.M. —_ = -- — 
907 ay 26 2 41 48 P.M. — —_ — a 
908 - 28 1 20 40 a.m. 130 | ES.E-W.N.W. 0°6 41 
vertical motion 05 O06 
909 ” ” 10 22 55 AM. 1 15 S.E.-N.W. 05 O05 
vertical) motion O04 OL 
910 7 ¥9 9 18 23 A.M. 0 20 E.-W. 0-2 0:2 
911 4 31 6 42 15 AM. 4 0 8.S.E.-N.W. 25 3°83 
vertical motion 06 2 
912 oe Pa 813 3 AM. ~- _— very slight 
913 Rs 5 59 42 P.M. 2 0 S.W.-N.E. 07 12 
vertical motion very slight 
914 TY. 3 4 27 21P.M. 1 30 S.E.-N.W. O7 15 
vertical motion 03 02 
915 s a 440 51 P.M. — - very|slight 
916 a 6 7 40 13 A.M. 0 50 S.W.-N.E. 05 0:3 
vertical motion very|slight 
917 “A 8 048 OPM. —_ = very|slight 
918 fy 14 6 22 54 A.M. = — very|slight 
919 a 17 9 41 43 P.M. _ — very|slight 
920 ae 18 2 7 42 P.M. oa E.S.E.-W.N.W. 1:0 08 
vertical motion O7 0-2 
921 rf Pr 2 64 11 PM. _ —_ very|slight 
922 + * 339 8 P.M. _— 5.E.-N.W. 09 03 
923 5 * 401P™M. _- _ very'slight 
