48 



MAGNETIC INTENSITY, FERN ROCK OBSERVATORY 



Set No. 1. Time of 2 vibrations 

 Set No. 2. " " 



Set No. 3. 

 Set No. 4. " " 



June 7, 1854. 



RECAPITULATION OF RESULTS, JUNE t, 1854. 



15 s . 288 Temp. 33 



15.288 " 33 



15.315 " 33 



15.313 " 33 



15.403 " 35 



15.412 " 35 



15.409 " 35 



15.409 * " 35 



4-34.0 



Mean 



Time of 1 vibration . 



15.355 



7.678 



June 7, 1854. Experiments of deflections. 



Deflecting magnet A. 67. Deflected magnet I. 10. Distance 0.9 feet. 



w. 



w. 



North pole. 



E. 



W. 



W. 



E. 



Circle read?. 



374 16'.3 



15.0 

 265 55.0 



54.0 

 260 58.0 



55.5 

 368 31.0 



30.0 



Mean. 



15'.7 

 545 



56.7 

 30.5 



2u. 



108 21'.2 



107 33.8 



Means 107 57.5 



Temp. 



36.2 



38.0 

 36.0 

 34.0 



36.0 



Experiments of deflections. 



Distance 1.3 feet. 



Magnet. 



E. 



W. 



North pole. 



E. 

 W. 

 W. 



E. 



Circle reads. 



331 33'.0 

 31.0 



300 34.0 

 33.0 



301 01.0 

 00.0 



332 37.0 

 35.0 



Mean. 



32'.0 

 33.5 



00.5 

 36.0 



2u. 



30 58'.5 



31 35.5 



Means 31 17.0 



Temp. 



34.5 

 34.3 

 35.8 

 35.0 



34.9 



These two sets of deflections were observed between the second and third set of the preceding 



vibrations. 



