U 



Newcomb and Dutton — Speed of Earthquake, etc. 





Group IV. 



— Stopped Clod's. 







Locality. 



State. 



Distance. 



Time. 



No. of clocks. 



wt 



Centrum, 



s. c. 







51 n 



'06 s 







Charleston, 



s. c. 



20 



51 



12 



4 



3 



Columbia, 



s. c. 



89 



51 





2 



2 



Savannah, 



Ga. 



89 



51 



55 



o 



2 



Langley, 



s. c. 



103 



53 





1 



1 



Augusta, 



Ga. 



111 



52 





1 



1 



Cochran, 



Ga. 



192 



52 





2 



o 



Macon, 



Ga. 



203 



51 



30 



1 



1 



Jacksonville, 



Fla. 



211 



52 





1 



1 



Atlanta, 



Ga. 



252 



52 



22 



4 



3 



Catlettsburg, 



Ky. 



405 



53 





1 



1 



Nashville, 



Tenn. 



438 



54 



12 



1 



1 



Columbus, 



Miss. 



481 



56 





1 



1 



Covington, 



Ky. 



488 



55 





1 



1 



Cincinnati, 



0. 



491 



54 





3 



2 



Cincinnati, 



0. 



491 



54 



21 



1 



1 



Meridian, 



Miss. 



500 



54 





1 



1 



Lockland, 



0. 



505 



54 



26 



4 



3 



Havre de Grace, 



Md. 



515 



55 





1 



1 



Pittsburg, 



Pa. 



525 



55 





1 



1 



Newcastle, 



Del. 



538 



54 





1 



1 



Atlantic City, 



N. J. 



552 



54 





1 



1 



Wooster, 



0. 



558 



55 



45 



1 



1 



Newcastle, 



Pa. 



565 



55 





1 



1 



Indianapolis, 



Ind. 



581 



55 





1 



1 



Memphis, 



Tenn. 



• 587 



54 



50 



6 



4 



Cairo, 



111. 



588 



53 





1 



1 



Meadville, 



Pa. 



60S 



55 





1 



1 



Newark, 



n. j: 



640 



55 





1 



1 



Brooklyn, 



N. Y. 



643 



55 





1 



1 



New York, 



N. Y. 



645 



55 



15 



2 



1 



Ithaca, 



N. Y. 



696 



55 





1 



1 



Manistee, 



Mich. 



855 



57 





1 



1 



We may arrange these in groups or sets according to their 

 distances, as was done in the discussion of group III, and ob- 

 tain the following equations of condition. 



to 89 x + 59y = 15 



103 to 192 x + 150y = 69 



203 to 252 x + 234y = 110 



405 to 491 x -f 469y = 194 



500 to 588 x -j- 549y = 209 



608 to 696 x -+- 642y = 237 



855 x -j- 855y = 354 



The normal equations are : 



45a 4- 183335 y = 7172. 

 18335cc -f 9567895 y = 3717233. 



light. 



Residuals. 



7 



+ 12-29 



4 



- 7-21 



5 



— 16-37 



7 



- 11-29 



.6 



+ 4-04 



5 



+ 12-80 



1 



- 24-97 



