MAGNETIC OBSERVATIONS 



101 



Magnet Z 6 suspended. 



Set 5. Vibrations. July 1, 18G1. 



M. T. Pocket clironometer ; rate nearly zero. 



Temperature, 51° 



Number. 







10 



20 



30 



40 



50 



100 



Arc; 



Chronometer 

 11" 01° 2P 

 02 

 03 

 04 

 05 

 06 

 12 



29 

 36 



44 



52 



59 



38.5 



204 and 402 at beginuinj 

 294.5 305 at end, 



Number. 

 300 

 310 

 320 

 330 

 340 

 350 

 200 



Chronometer. 

 IP. 35-" 16' 



36 



37 



38 



39 



40 



23 

 or 

 or 350 vib's. 



300 vibrations. | 



33'' 



55' 



33 



55 



33 



56 



33 



56 



33 



55 



33 



56 



33 



55.5 



Observations for Torsion. 



Torsion circle. 



50° 

 140 

 230 



50 



Scale. 

 300 

 320.1 

 286 

 300.5 



Differences. 



20.7 

 34.1 

 14.5 



Observed time of 

 300 vibrations, 2035=.5 

 Time of one, 6.1850 



Mean ('4^ = 11.5 = 11'. 1 



Set 6. 



Vibrations. P. M. July 8, 1861. 



Number. 

 



10 

 20 

 30 

 40 

 50 

 100 



Magnet Z 6 suspended on 4 fibres. Temperature, 41°. 



Chronometer, 

 l" 13-" 03' 



14 10.5 



15 18 



16 26 

 11 33.8 

 18- 42 

 24 21.2 



Arc : 205 + 395 

 264 335 

 283 311.5 at 350 vib's. 



Number. 



300 



310 



320 



330 



340 



350 



200 

 at 

 at 200 



Chronometer, 

 l" 41° 02' 



48 09 



49 11.2 



50 25 



51 32.8 



52 40.5 

 35 41 



300 vibrations. | 



33° 



59'.0 



33 



58.5 



33 



59.2 



33 



59.0 



33 



59.0 



33 



58.5 



33 



58.86 



Observed time of 

 300 vibrations, 2038'. 86 

 Time of one, 6.1962 



Set 1. Vibrations. Temperature, 40°. 







2" 04° 08' 



300 



2'- 38° 



05' 



33° 



51'.0 





10 



05 15 



310 



39 



12.5 



33 



51.5 



Observed time of 



20 



06 22 



320 



40 



20.5 



33 



58.5 



300 vibrations, 2038'.25 



30 



01 30 



330 



41 



28.5 



33 



58.5 



Time of one, 6.1942 



40 



08 38 



340 



42 



31 



33 



59.0 





50 



09 46 



350 



43 



45 



33 



59.0 





00 



15 26 



200 



26 



46 



33 



58.25 







Arc: 180 and 420 at 















254 34 



3 at 200 













219 



321 at 350 vib's. 



Set 8. Deflections. P. M. July 8, 1861. 

 Magnet Z 1 suspended, Z 6 deflecting; distance 1.0 foot. 



E. 



E. 



10° 12' 



20" 



13' 20" 



38° 



" 



W. 



302 32 



10 



.32 50 



31.5 



W. 



E. 



11 50 



00 



50 50 



38 



" 



W. 



303 36 



00 



IV 



36 40 



38 





;ean 



. 31.9 







Set 9. 



Deflect 



ons. Distance 1.3 foot. 



w. 



W. 



321° .38' 



20" 



39' 00" 



38° 



" 



E. 



.352 11 



10 



12 00 



38.5 



E. 



W. 



321 48 



20 



49 20 



39.5 



" 



E. 



351 48 



00 



49 00 



38 



Mean 



38.5 



2m = 61°,40' 20" 



2jt = 68 14 05 



M = 33 58 36 



2« = 30° 32' 55" 



2?( = 29 59 40 



u = 15 08 08 



