OBSERVATIONS OF INTENSITY. 



521 



Table I. 





Time of Vibration. 









Rio de Janeiro. 







Interval. 



Loss. 



Per Diem. 



Horizontal. 



As a Dipping 

 Needle. 



August 29, 1826... 

 September 15, 1827 



S. 



545,2 



551,7 



S. 



537,0 



543,5 



Days. 



} 382 



s. 



6,5 



•017 



December 21, 1828 



561,* 



552,7 



462 



9,a 



•020 



June 1, 1830 .... 



563,8 



555,4 



527 



2,7 



•005 



Table II. 



Station. 



Madeira 



PortPraya...| 

 Sta Catharina 

 Gorriti i 



Monte Video 



Sea Bear Bay 

 St. Martin 

 Cove ' 



Port Famine 



Date. 



Chiloe I 



Juan Fernandez 

 Taleahuano 



Valparaiso... 



1826 May 31 



1826 June 22 



and 24 



1827 Nov. 3 



1826 Oct. 29 

 and Nov. 6 



1829 Jan. 10 



1827 Dec. 18 



1828 Oct. 8 



1830 June 



1829 Mar. 



1827 Jan. 

 and 



— Mar. 



1828 Jan. 



— May 



— June 

 and July _ 



1830 April 26 



1829 Sept. i\ 

 and Dec. 15/ 



1630 Feb. 19 



1829 Dec. 18 



1830 May 

 1829 Aug 



1 



20 

 >5J. 



22 J 



27 

 28 



8 



181 

 30/ 



Time of Vibration. 



At the Station. 



Horizon. 



As a As a 

 Dipping Dipping 

 Needle. Needle. 



1830 Jan. 11 



and Feb. 



627,79 

 557,08 

 553,58 

 549,44 

 562,78 



553,87 

 560,95 

 564,89 

 576,37 

 584,29 

 585,08 

 589,36 

 596,54 



595,81 

 598,97 

 565,23 



551,83 



555,59 



557,1 



548,59 



551,60 



At Rio. 



S. 



430,1 



465,4 

 532,7 



497,0 



509,0 

 496,7 

 503,0 

 506,6 

 446,0 



414,9 



415,4 

 417,5 

 422,6 



422,1 



424,3 



453,7 



464,7 

 466,5 

 467,4 

 479,5 



482,1 



536,6 

 536,6 

 544,5 

 538,1 

 552,8 

 545,4 

 551,3 

 555,4 

 553,1 



539,4 



540,6 

 546,2 

 548,2 



549,3 

 555,1 

 554,2 



554,8 

 554,6 

 555,3 

 553,9 

 554,6 



Intensity. 



Rio=l,000. 



1,4131 

 1,412 J 



1,334. , 

 1,324/ 



1,412 



329 



1,377 

 1,177 

 0,920 



1,041 



1,065 

 1,361 



1,498 



1,505 



1,321 

 1,262 

 1,250 



1,176 



