48 



REPORT ON 



HORIZONTAL INTENSITY. 

 Calculation. 



(i-(t'-t)q) 



Observed time of 150 vibrations 

 Time of one vibration 

 Correction for rate 



799'. 85 



5-332 



.000 



= 5-332 



q 



f t 



(t'-t)q 

 I (f t)q 



+ 4-3 



mX 



' K 



T' 



JVJ 



T 1 



S K 



mX 

 m 



7-740 



Log's. 



0.72689 



1-45378 



65 



9.99962 



I-45405 

 2.17768 



0.72363 



9.83487 



0.88876 



* Ob's of defl'n. Date. May 3oth, 1866. 



8 4 -7 



The chronometer used in this observation was 

 i h 41" 22'. 2 fast of local mean time. 



HORIZONTAL INTENSITY. 

 Observations of Deflections. 



Station, Acapulco, Mexico. Date, May 3oth, 1866. Mag. C. 32 deflecting. Mag. S. 8 suspended. 



Observer, WM. HARKNESS. 



