MAGNETIC OBSERVATIONS. 



Horizontal Intensity. Observations of Vibrations. 



103 



Bahia, December 27, 1865. 



5». 6 

 4-9 

 4-1 

 3-6 

 2.9 

 2.2 



7 h 28° 55 8 .6 

 7 29 55-° 

 7 3° 54-4 

 7 31 53-6 

 7 32 53° 

 7 33 52.2 



Mean 



Time of 150 

 vibrations. 



I4» 50».o 

 14 50.1 



14 5°-3 



14 50.0 



14 50.1 



14 50.0 



14 50.08 



Extreme scale readings, 



At beginning .... 92.8 — 63. 1 

 At end 86.8 — 68.3 



Coefficient of torsion . . v = 4.8$ div. 



Temperature 92 . 5 



Time of one vibration . . 5". 934 



Bahia, December 27, 1S65. 



Inertia ring on magnet. 



4 s - 2 

 20.8 

 37° 

 53-4 



9.8 

 26.0 



150 



160 

 170 

 180 

 190 

 200 



22" 9«.4 



23 25.8 



24 42.2 



25 58.6 



27 14.8 



28 30.8 



Time of 150 

 vibrations. 



S».2 

 5° 



5-2 

 5-2 



5.0 

 4.8 



19 5-°7 



Extreme scale readings, 

 At beginning . 

 At end .... 



Coefficient of torsion 



Temperature . 



Time of one vibration 



57.9—100.4 

 67.9 — 89.2 

 v = 6.70 div. 

 97°-5 

 7 s - 634 



Rio Janeiro, January 6, 1866. 



6». 8 



5.8 

 6.6 

 7,0 

 7-7 



3 h 36m I2».5 



3 37 12.5 



3» 133 



39 13-6 



40 14.5 



41 15.0 



Mean 



Time of 150 



vibrations. 



5 s - 7 

 6.7 

 6.7 

 6.6 

 6.8 

 6.9 



15 6.57 



Extreme scale readings, 



At beginning .... 62. 1 — 96.3 

 At end 70.0 — 89.2 



Coefficient of torsion . .v = 5.10 div. 



Temperature 7°°.° 



Time of one vibration . . 6 s . 044 



Rio Janeiro, January 9, 1866. 



5 h 3o m u». 8 



S 3i '2.4 



S 32 130 



5 33 «3-4 



5 34 



14.0 

 14.6 



150 



160 

 170 

 1S0 

 190 

 200 



20". 2 

 2I.O 

 21.5 

 22.1 

 22.6 

 23.2 



Mean 



Time of 150 

 vibrations. 



8-. 4 

 8.6 

 8.5 

 8.7 

 8.6 

 8.6 



15 8-57 



Extreme scale readings, 



At beginning . . . . 62.2 — 98.1 



At end 69.2 — 91. 2 



Temperature 8o°.5 



Time of one vibration . . 6*.057] 



Monte Video, January 18, 1S66. 



8«.2 



8.2 



8-3 

 8.2 

 8.5 

 8-5 



I" 4 2» 



I 43 

 1 44 



' 45 

 1 46 



1 47 



9'. 4 

 9-5 



9-7 

 9-7 

 9-7 

 9-9 



Time of 150 

 vibrations. 



«-3 



1-4 

 '•5 

 1.2 

 1.4 



Extreme scale readings, 

 At beginning . 

 At end .... 



Coefficient of torsion 



Temperature . 



Time of one vibration 



58.4 — 98-3 

 66.8 — 90.2 

 = 5.10 div. 

 84°. o 

 6". 009 



Monte Video, January 18, 1866. 

 Inertia ring on magnet. 



2 h lo m 3". 2 



2 11 20.5 



2 12 37.8 



2 13 55-1 



2 15 12.4 



2 16 29.8 



29 m 2 2 s . 9 

 30 40. 1 



3« 57-3 



33 '4-6 



34 3i-8 



35 49-3 



Time of 150 



vibrations. 



ig" 1 9'. 7 

 19 19.6 



19 19 

 19 19 

 19 19 



Extreme scale readings, 

 At beginning . . 

 At end .... 



Coefficient of torsion 



Temperature . 



Time of one vibration 



56.9 — 101.0 

 65.9 — 91.4 

 r . = 6.25 div. 

 84°.S 

 7"-73° 



