86 



REPORT — 1844. 



REGISTER FOR 



EXPLA- 



A The hours of the day before noon to be indicated by A, the hours after noon to be 



4 o'clock in the 

 B Marking the least perceptible as 1, and a shock equal to that on Oct. 23, 1839, as 10, 



loud as shock re- 

 C If the concussion be single, to be marked C ; if double, CC ; but if the second be smaller 



would indicate two shocks, the 



D To be entered C, H, or T, according as it has been a Crash, Heave, or Tremor, or two, 



would indicate a shock beginning with a slight concussion, then a considerable heave, 



the three qualities 

 E The first column here is merely for entering the direction the shock appeared to the 



the Dip to be entered of course only where the 

 F In like manner, in these columns the height of Barometer and Thermometer to be en- 

 wind to be indicated by 1 for the gentlest current, 

 G Where there is no rain-gauge the quantity of rain to be marked in general by the letters 



A B C D E F 



Day of 



the 

 Month. 



Time of the 

 day. 



Dura- 

 tion in 

 Seconds. 



Instant of Shock. 



Marked by the 

 Seismometer. 



"3g \li 

 §1 i "! 



Aug.25. 



Sept. 1. 



' 16. 

 Nov .25. 

 .26. 



Feb. 6. 

 ■ 16. 



Apr. 1. 

 May 11 



July 9. 

 Aug.25. 

 Sept. 1. 



P 1 



A 1 



A 2 



A I 



A 1 



A 1 



H 2 



? 1 



