FOURTH REPORT OF THE DIRECTOR 1907 



37 



A description of the instruments in use at the station has been 

 given in a previous report. The important constants appHcable to 

 the interpretation of the records are as follows: Latitude, n. 42° 

 39' 6"; longitude, w. 73° 45' 18". Weight of each pendulum, in- 

 cluding arm, 11.283 kilograms. Distance of center of gravity from 

 rotating axis 84.6 centimeters. The period of the pendulum (time 

 required for a complete swing) averages 30 seconds, with variations 

 of two or three seconds from the mean. The recording arm has a 

 multiplying ratio of 10. The base of the instruments is approxi- 

 mately 85 feet above sea level. 



RECORD OF EARTHQUAKES AT ALBANY STATION OCTOBER I, I906 TO 



OCTOBER I, 1907 



Standard Time 



Da e 



1906 

 Oct. I 

 Nov. 14 

 Dec. 3 

 Dec. 22 

 Dec. 23 



1907 



Jan. 2 

 Jan. 4 

 Jan. 14 

 Mar. 31 

 Apr. 15 

 May 28 

 May 31 

 June I 

 June 4 

 June 28 

 July I 

 Aug. 17 

 Sept. 2 

 Sept. 23 



Beginning 

 preliminaries 



h. 



9 



I 



5 



I 



12 



7 

 12 



3 



5 



I 



10 



8 



3 

 10 



I 



8 

 II 

 1 1 



4 



m. 



28 p. m. 

 34 P- m. 

 03 p. m. 

 39 P- m. 

 39 P- m. 



53 a. m. 

 43 a. m. 

 47 p. m. 

 16 p. m. 

 14J a. m. 

 00 a. m. 



a. m. 



a. m. 



p. m. 



p. m. 



a. m. 



a. m. 



02 

 55 

 31 

 25 

 14 

 40 

 12 

 46 



Beginning 



principal 



part 



h. 



2 

 12 



7 



I 



03 

 52 



55 

 25 



19* 



a. m. 

 p. m. 



II 



23 

 36^ 



Maximum 



h. 



2 

 12 



15 

 52 



56 

 26 



33 

 12 



8 28^ 

 ii 38 



End 



h. 

 10 



J 



5 

 3 



I 



m. 

 30 

 41 



30 

 o 



34 



8 24 



2 17 



4 12 



5 47 



3 o 



9 



4 



II 



2 



9 

 12 



3 



5 



00 



38 



53 

 12 



15 



15 p. m. 



00 p. m. 



37 



Max. 

 ampli- 

 tude 



I 



7 



10 



5 



8 

 6 

 1-5 



a 



50 

 50 



a Amplitude over 150mm maximum exceeding the limit of registry. 



October i. A slight movement lasting a little over an hour 

 and registered only on the north-south pendulum, showing the direc- 

 tion to be nearly at right angles. The same disturbance was noticed 

 at the stations at Washington, Isle of Wight and Perth, Australia. 

 Its origin was not definitely fixed, so far as has been learned, but it 

 was probably in the southern Pacific or Indian ocean. 



November 14. A small disturbance, probably centered within 

 2000 miles of Albany. Slight shocks were reported in New Mexico 

 and Kir. ;ston, Jamaica. 



