126 REPORT—1843. 
REGISTER FOR 
EXPLA- 
A The hours of the day before noon indicated by A, the hours after noon indi- 
the after- 
B Marking the least perceptible shock as 1, and a shock equal to that on Oct, 23, 1839, as 10, 
loud as the 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 Entered C, H, or T, according as it is a Crash, Heave, or Tremor, or two, or all; 
indicate a shock beginning with a slight concussion, then a considerable heave, and 
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 is en- 
wind indicated by 1 for the gentlest current, 
G Where there is no vain-gauge the quantity of rain to be marked in general by the letters 




















A B Cc D E F 
* Dura- . 
Time of the |Violence| ,- = go ; hs 
: tionin| 5 Direction, Instant of Shock. 
Year day. of the Seconds. z 4“ 
e 
1842-3.| 7] & E 
ms = Marked by the 2 : 
| a Seismometer. Wind. 8 
‘DB g | 5 3) 
= s | eae (aes : S “I 
Day of i} Cf se\es les] & Bes ou4|' ee 
the AS he |. 1.18 1] | $.|en) ee] o3 |. B/s/a|# 
month. o |S (| sii sie] 8 |e] se |S SE se) 2 ELBE] s 
BlElSig|S\e E 3 a8 bao oe  if/ £| 2 
£12/2\8\8|4'8|8 || 2 BP iat! & IR|O\al a 
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=A PORS Soy | oP awe ' 
—? Bil oy Ai 1 
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— ? ? wee ? ? 
— ? cr, ? 
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