EARTHQUAKES ON THE PACIFIC COAST 



173 



roars, and was the second of that kind that he had observed. Just 



before the shaking there was a noise as of heavy wagons being 



hauled over hard ground a long way off. 

 A distinct shock (2.40 a. m.) W. N. W. and E. S. E. was registered 



at Berkeley. — Professor Soule. 

 Mr. Burckhalter, of Chabot Observatory, Oakland, was ready for it, 



and his seismograph reduced the earth's movements to black and 



white. When it registered on this side the curves were replaced 



by erratic angles. 



Fig. 2. — Tracino; of the seismograph at the Chabot Observatory, Oakland. 



(Magnified.) 



The ferry depot (foot of Market Street) rocked and creaked, and 

 those inside of it started to run for the door. Every clock in the 

 building, including the tower clock, stopped, and all showed the 

 same time, viz., 2.53 o'clock (VI?, VII?). On board the ships a 

 slight trembling was felt that lasted about ten or twelve seconds. 

 The shock was felt only by those who happened to be on deck. 



The ferry tower pendulum is between 50 and 60 pounds veeight 



