48 



REPORT ON 



Horizontal Intensity. 

 Calculation. 



T» = T»(i+-5.) (i_(t'-t)q) 



Observed time of 150 vibrations = 799 s - 85 

 Time of one vibration = 5.332 



Correction for rate = .000 



T' 



5-33 2 



q 

 t' — t 



(t'_ t)q 

 1 — (f — t)q 



+ 4-3 







Log's. 



T' 



F 



1— (f — t)q 



T 2 



rt 2 K 



mX 

 m 



0.72689 



1-45378 





6S 





9.99962 



Y rt ' K 



I-45405 

 2.17768 



0.72363 

 9.83487 



7.740 =X 



0.88876 



* Ob's of defl'n. Date. 



t = 84° 



The chronometer used in 

 i h 4i m 22 s . 2 fast of local n 



May 30th, 1866 





7 



*m 



X 



mX 



m 2 

 m 



8.94854 



0.72363 



9.67217 

 9.83608 



this obse 

 lean time 



:rvation 



was 



Horizontal Intensity. 



Observations of Deflections. 



Station, Acapulco, Mexico. Date, May 30th, 1866. Mag. C. 32 deflecting. Mag. S. 8 suspended. 



Observer, Wm. Harkness. 



1 







Time. 

 A.M. 



h. m. 



Temp, 

 t 



Scale 

 Readings. 



Alternate 

 Means. 



Diff's. 



Dist. 





W. 

 E. 

 W. 

 E. 



7 22 



86° 



S3 d -9 

 107.0 



53-9 

 107.0 



5 3 d - 9 

 107.0 



5 3 d - 1 



to 

 







6 

















II 



a! 



E. 

 W. 

 E. 

 W. 



7 32 



84 



107-5 

 53-5 



107.7 

 53-8 



107.6 

 53-6 



54-o 



60 

 O 



O 

 II 



U 











Means, 





85.O 



2U d 



53-53 





