I 



EAKTHQUAKES ON THE PACIFIC COAST 123 



N. and S. (HI). — Truckee: 8.47, duration two iseconds {S. F. Ex- 

 aminer, April 29.) — Oroville: 8.45 p, m. Short, quick shock. — S. F. 

 barely perceptible in third story of 917 Pine Street. No record 

 on duplex seismometer in basement (I). Carson, 8.47 p. m., S. 

 N., (IV), lasting 5 to 6 sec— C. W. F. 



1888. April 30; about 4 a. m. 



Grass Valley: Tidings, April 30. — Downieville, 3.40 a. m., two light 

 shocks (IV), {S. F. Bulletin, April 30). 



1888. May 4; 1:55 p. m. 



S. F., 917 Pine Street, decided shock, not registered on duplex 

 seismometer, J. E. J. — S. F., slight shock (II) of a few seconds' 

 duration (Bulletin, May 4). 



1888. May 6: Oh. 42m. 22s. p. m. 



Lick Observatory: sudden shock (III) E. S. H., preceded by a rum- 

 bling noise (Porcher). (Registered on duplex seismometer.) 



1888. May 27; 1:50 a. m. 



Carson (Nev.), S. N.; light, followed by quite a heavy shock 20 sec. 

 later.— C. W. F. 



1888. July 6. 



Wellington (Nev.), 5.25 p. m. A slight shock. 



1888. July 11; at nigrbt. 



Susanville: slight shock (IV??), S. F. Bulletin, July 13. 



1888. Augrust 13. 



Wellington (Nev.), 2.50 p. m. A slight shock. 



1888. August 14; 9:57 a. m. 



S. F., 917 Pine Street. Intensity (II) on R. F. scale. The duplex 

 seismometer gives a looped trace on the plate (magnified four 

 times) 7 mm. N. N. E. to S. S. W. (direction of first shock), 4 mm. 

 at right angles to this. — Lick Observatory: direction on the plate 

 N. N. E. The trace is a wavy line (magnified four times) 8 mm. 

 long. N. N. E. and S. S. W. with six waves 1 mm. high at right 

 angles to this. Probably the shock was nearly vertical here. 



1888. September lO; 1:53 a. m. 



S. F., 917 Pine Street: slight shock (II) not registered on duplex 

 seismometer, J. R. J. — Oakland: slight shock, C. Burckhalter. 

 Three shocks at 1.50 a. m. in quick succession, attended by noise; 

 windows did not rattle (III?), Dr. Trembley. It waked sleepers 

 in Oakland (V?), E. Booth.— Berkeley: slight. 



1888. September 15? 



Lick Observatory: the seismograph started at 6.15 a. m., but as the 

 record was not like that of a shock, Mr. Keeler (in charge of the 

 instrument) supposes the tremor which started the instrument 

 to have been due to a high wind. 



