30 



ANNUAL REPORT OF THE 



priate distances from the Station, as well as indicating the paths of 

 surface waves reaching the Station. During the summer a common 

 alarm clock wired with an hourly electric contact of about 10 

 seconds was placed in the circuit with the timing device so as to 

 designate the even hours on the chronographic drums. 



During the summer of 1909 brief notices of registered earth- 

 quakes were reported to the Boston evening transcript. An in- 

 quiry from the Press as to the probability of a telegraphic message 

 just received to the effect that Charleston had been again destroyed 

 by an earthquake was answered, after a brief inspection of the seis- 

 mograph, with assurance that that city had not been damaged. 



At present the records of important earthquakes are being placed 

 back to back between glass covers bound in the manner of stereop- 

 ticon views with strong tape and filed for reference. 



Records of the Station 









Begin'g 

 First 

 P. T. 



Begin'g 

 Second 

 P. T. 



Begin'g 

 of Long 

 Waves 



Max. 

 Ampli- 

 tude 



End 

 of Long 

 Waves 



End 

 of Earth- 

 quake 



Duration 

 of Earth- 

 quake 



Date 





Vi 



V2 



Wi 



















M 



h. m s. 



h. m. s. 



h. m. s. 



h. 



m. s. 



h. m. s. 



h. m. s. 



h. m. s. 



1908 

























May 



15 



A 



3 39 43 



3 54 01 



3 55 45 



3 



56 40 





4 18 15 





38 32 



Aug. 



13 



P 



8 52 21 



8 56 54 



9 04 36 



9 



04 57 



9 10 04 



9 50 29 





58 08 





17 



A 



5 56 15 



6 02 47 



6 11 03 







6 12 27 



7 00 15 



1 



04 04 





29 



P 



1 14 50 



1 19 32 



1 22 34 



1 



23 49 



1 26 54 



1 49 00 





34 10 



Sept. 



21 



A 



1 56 39 



2 05 03 



2 11 54 



2 



12 11 



2 15 19 



3 43 05 



1 



46 26 



Nov. 



30 



P 



4 43 46 



4 50 52 



4 57 52 



4 



58 40 



5 03 52 



6 11 39 



1 



28 02 



Dec. 



27 



A 



11 39 23 



11 46 43 



11 54 29 



12 



02 25 



12 07 50 



12 52 19 



1 



12 56 



1909 

























Jan. 



23 





t 



















May 



17 



26 



A 



3 + 

 t 



3 



3 















June 



4 



P 



2 03 10 



2 41 00 



2 53 50 



3 



06 30 



3 16 40 



4 01 40 



1 



08 30 



July 



7 



P 



4 50 54 



? ? ? 



5 02 48 



5 



04 40 



5 04 48 



6 00 45 



1 



09 51 





30 



A 



5 58 59 



6 03 00 



6 14 — 









7 45 ? 



1 



46 + 





31 



P 



2 25 42 



2 31 42 



2 41 09 



2 



42 28 



2 50 45 



3 27 06 



1 



01 24 



Aug. 



14 



A 



2 27 50 













2 40 00 





12 60 





16 



A 



2 05 46 



2 11 48 



2 18 48 



2 



20 00 



2 24 48 



3 14 00 



1 



08 14 





30 



A 



8 07 





8 20 30 



8 



22 













31 



A 



7 06 15 



7 10 6 



7 13 00 



7 



13 06 





7 51 27 





45 11 





31 























N. B. 75th Meridian time. P. T. = preliminary tremors. V 1 , V 2 W 1 are symbols 

 in common use for times of vibrations named in respective Columns, 

 t Record interlaced. A = N-S Component; B = E-W Component. 



