Report on the Observatory Department. 



449 



APPENDIX III — Table I. 



Register of principal Seismograph. Disturbances. 1900. 























Maximum 







~No. in 

 register. 





Commence- 

 ment 

 of P.T.'s * 



Duration 



First 



Second 



amplitude. 



Total 

 duration 







of P.T.'s.* 



maximum. 



maximum. 



mm. 



Sees, 

 of arc. 



of disturb- 

 ance. 









h. 



m. 



m. 



h. 



m. 



h. 



m. 







h. 



m. 



200 



Jan. 



5 



19 



21 -6 



40 '2 



20 



7*9 



20 



11 -5 



1-0 



0-85 



1 



42 



i 207 



May 



17 



6 



37 -0 



8-2 



6 



48-8 



6 



50-6 



0-6 



0-50 







31 



209 



20 





46-2 



103 



7 



24-6 



7 



29-5 



15-0 



12-60 



3 



12 



226 



11 



i? 



353 



9-9 



18 



20-6 







0-6 



0-53 



1 



36 



230 



5) 



June 



16 



20 



23-7 



10 -6 



21 



1 -8 



21 



3-8 



1-2 



0-92 



1 



58 



237 



21 



20 



47 -3 



26-3 



21 



40-9 



21 



45 '4 



2-5 



1-73 



3 



48 



244 



July 



29 



7 



18 -5 



13-5 



8 



37-2 



8 



39-3 



0-9 



0-63 



3 



13 



247 



Aug. 



28 



11 



8-0 



5'2 



11 



13-8 



11 



20-2 



1 -3 



92 







44 



253 



Oct. 



7 



21 



31 -2 



29 -4 



9 2 



10-0 



22 



12-0 



1 -4 



1-05 



2 



25 



254 



3) 



9 



12 



34 -7 



13 '5 



Is 



8-4 



13 



18-6 



8-0 



6-00 



4 







256 





29 



9 



21 -5 



8-7 



9 



43 -2 



9 



44-1 



12 -6 



9-45 



6 



30 



i 257 



Nov. 



5 



8 



13 2 



19-2 



8 



40 -0 







0-9 



0-68 



1 



13 



258 



5 3 



9 



16 



30 2 



23-0 



16 



55-0 



17 



-8 



1 -2 



0-90 



1 



8 



259 





9 



18 



38 -5 



9-0 



18 



53 -1 







0-7 



0-52 







52 



262 





24 



8 



8-7 



9'6 



8 



47-8 







2-5 



1-87 



2 







265 



Dec. 



18 



23 



37-0 



21-8 



24 



7'7 







1 -5 



0-87 



1 



8 



| 266 





25 



5 



16-4 



9.S 



5 



27-4 



{1 



55-11 

 6*7 J 



3 -5 



2-03 



3 





* P.T.'s = preliminary tremors. The times recorded are Gr.M.T. ; midnight = or 24 hours. 

 The figures given above are obtained from the photographic records of a Milne Horizontal 

 Pendulum; they represent E — W displacements. 



