60 



MAGNETIC INTENSITY, FERN ROCK OBSERVATORY 



June 24, 1854. 



Experiments of vibrations. (Right to left.) 



Time by chronometer 264. 



5'' 18"' 46«.2 



19 01.9 

 17.2 

 32.8 

 48.2 



20 03.6 

 19.0 

 34.3 

 49.T 



21 0.5.1 

 20.0 



41 

 42 

 43 

 44 

 4.5 

 46 

 47 

 48 

 49 

 50 

 51 



Time by ch 



5h 29" 02^7 



18.0 

 33.6 

 49.0 

 04.2 

 19.7 

 35.0 

 50.4 

 05.8 

 21.5 

 36.8 



80 



31 



. of 40 double vibrations. 



10™ 16^5 

 16.1 

 16.4 



16.2 

 16.0 

 16.1 

 16.0 

 16.1 

 16.1 

 16.4 

 16.2 



10 16.19 



Arcs and temp, as before. 



Time of 2 Tibrations 15^405. 



Set No. 1. Time of 2 vibrations 



Set No. 2. 



Set No. 3. 



Set No, 4. 



Mean 



Jmie 24, 1854. Experiments of deflections. 



Deflecting magnet A. 67. Deflected magnet I. 7. Distance 1.3 feet. 



W. 



North pole. 



Circle reads. 



w. 



E. 

 E. 

 W. 



300° 17' 



15 

 330' 29 



27 

 330 41 



40 

 300 04 



03 



Means 



Temp. 



16'.0 



28.0 

 40.5 

 03.5 



30° 12'.0 



30 37.0 

 Means 30 24.5 



44°.2 

 48.0 

 42.2 

 42.4 



42.9 



Experiments of deflections. 



Distance 0.9 feet. 



Magnet. 



E, 



North pole. 



Circle reads. 



Means. 



Temp. 



w. 



E. 

 E. 

 W. 



261° 24' 



22 

 367 31 



80 

 378 07 



05 

 264 02 



01 



23'.0 

 30.5 

 06.0 

 01.5 



106° 07'.5 



109 04.5 



Means 107 36.0 



41.4 

 41.0 

 42.4 

 41.7 



41.6 



