ON EARTHQUAKES IN GREAT BRITAIN. 127 
EARTHQUAKE SHOCKS. 


NATIONS. 
cated by P; thus, 4 o’clock in the morning is marked in the Table 4 A ; 4 o’clock in 
noon, 4 P, 
and intermediate degrees of intensity by intermediate numbers ; thus, one half as violent or 
ferred to, to be entered 5. 
than first (which is almost always the case) the latter to be marked with a small c; thus C c 
second weaker than the first. 
using the small letters here too to mark the relative force of each; thus cH t would 
ending in a slight tremor; and C HT, one such as that of Oct. 23, 1839, where all 
were intense. 
observer to proceed from, most needed in slight shocks that do not affect the instruments ; 
instrument enables the observer to ascertain it. 
tered only by those observers who have such instruments at hand. The strength of the 
and 10 for a hurricane; and a calm, 0. 
M, much, and L, little. 








F G 
Five minutes after 3 = & 
Shock. g|.€ & 
S I a] 
o fo} > 
B| & zg 
2 sé ss Other particulars not included in preceding list, that 
Wind. | & | 8 Sa as 
v @ = a = Ag might be considered as either directly or indi- 
5 o};s £"s Ss 
g os]. 5/2 g5 rs PI rectly connected with the shocks. 
S/E/Ela/#)5).° a 
elElsleltlel = 2 
gE /S(2\8le |e] & < 
A |HIAl/alana|& 
vs | se: [July 2°59\ July 29°78 July 1. Fine day and night. Wind westerly. 
xe | Seas aus tere’|.:aes Wen \eabaaprene semeuee [July 10. Wind 3 A 
Spe eed reap eet etd tn? laoreet y ind moderate and westerly. Day showery. 
A eeeeeeee 
aes Aug. 27. Beautiful sunny morning. Light easterly wind. 
see | ae» | eee (Sept. 2°86 5 srs i weil ings gy 08 | 


Sept.24, Barometer and thermometer were stationary for 
three quarters of an hour after shock, At Comrie 
shake most violent in middle; at Cluan most violent 
in commencement, Whilst one of Seismometers 
see | nee | coe | see | one | -se [Oct. 0°88/Oct, 20°87 had head thrown to north-west one-eighth of an 
tee | eee | eee | vee | eee | eee |NOV. 280) Nov. 29°62} inch, another of a different kind thrown west to same 
extent, 
. -| a eee | ssseuee |Nov. 29. Fine day, but cloudy and showery. 
wee | ase | eee | eee | eee | eee Dec. 6°10/Dec, 29°75|Dec. 4, Morning and evening cloudy, A red sun-set, 
Dipti cated capdgl saan dared Siebul)  asidasape semeuee |Dec, 17. Cloudy and showery day; towards evening rain 
and wind. These three shocks served only at Tom- 
perran, not at Comrie, 






+» |Jan, 2°91 Jan. 29°43 
+ | see | oe [Feb 1°04) Feb. 29°69 
29°12} ...| E| 0| D | M |Mar. 3-22)Mar. 29:72|March 23. Day very foggy, dark and rainy; very heavy 
| M eae at4p.m. Barometer at 9 a.m. 29°17 ; at 9 p.m. 
29°35, 
one | cee | cee | one | one | one oral 5°17| Apr. 29°59 
L |May 3°56)/May 29:60|May 14. Showers and cloudy ; a blink at noon; at 1 p.m. 
pa) | oda and after, chill and cloudy. 
i geet MOI Way ie a A bate A sessesree | May 28, eer: cold wind ; slight showers after 5 p.m., 
very cold. 
M |June 2'22)June 29'90|June 4. The first shock felt with equal severity at Com- 
rie, Clatheck (two miles east) Invergeldy (six miles 
north of Comrie). The seeond shock observed only at 


Clatheck, 
web) A omey if bees] oe) | any ds DE] | ce cssepae ssuse+, |June 10, Cloudy, with occasional sunshine; rather cold, 
and windy evening. 
weal Mace Yack | Meee 1 MIC’ ddeore Ba abhshae June 15. Clear sunshine and very warm. Two additional 
shocks thought to have occurred today. 
Cie taal ge cis Mee te DE eR sees |JUne 17, Clear sunshine and very warm. 



