MAGNETIC OBSERVATIONS. 



Horizontal Intensity. Observations ov Vibrations. 



105 



Valparaiso, March 29, i860. 



12" 37= 

 12 38 

 12 39 

 12 40 

 12 41 

 12 42 



M. 



No. 



Q'.O 



150 



7-4 



160 



5-7 



170 



4-3 



180 



3-4 



190 



2.0 



200 



12" Sl m 47*-4 



12 52 45.8 



12 53 46.2 



12 54 44.2 



•2 55 40.4 



12 56 — 



Mean 



Time of 1 50 

 vibrations. 



I4 m 3S"-4 

 14 38-4 

 14 40.5 

 14 39-9 

 14 37-0 

 14 — 



14 38. S 4 



Extreme scale readings, 



At beginning .... 61.3 — 97-2 



Temperature 76°. o 



Time of one vibration . . 5 a .S59 

 Magnet brought to rest by the vibrations of the instrument 

 caused by the wind. 



Valparaiso, March 29, 1866. 



No. 



I 29 



I 30 



I 3' 



32 



7". 2 



5-2 



6.S 



2.4 



0.6 



I 32 58.6 



Time P M T ' me ° f '5° 



vibrations. 



I h 42"" 49 a .o 



I 43 48. o 



I 44 46.9 



I 45 45-2 



1 46 43.8 



1 47 43o 



Mean 



I4 m 4i a .S 

 14 42.8 

 14 40.1 

 14 42.8 

 14 43.2 

 14 44.4 



14 42.52 



Extreme scale readings, 



At beginning .... 63.0 — 988 



At end 65.5 — 96.0 



Coefficient of torsion . . z> = 3.80 div. 



Temperature 75°' 5 



Time of one vibration . . 5 S .SS3 

 Vibrations irregular on account of the wind, which, at 

 one time, almost brought the magnet to rest. 



Valparaiso, April 7, 1S66. 



. M. 



No. 



I.J-.6 



150 



14.2 



160 



13.2 



170 



u.8 



180 



11. 2 



190 



9.0 



200 



io h i6"> 55".o 



10 17 54.2 



10 18 53 " 



10 19 53 



10 20 52 



10 21 51 



Mean 



Time of 150 

 vibrations. 



39'-4 

 40.0 

 40.4 

 41.2 

 41.2 

 41.6 



14 40. 6 j 



Extreme scale readings, 



At beginning . 



At end 



eroefficient of torsion 

 Temperature .... 

 Time of one vibration . 



59.8 — 102.8 

 56.5 — 106.5 

 v = 3.92 div. 

 66°. 5 

 y.871 



No. Time P. M 



Valparaiso, April 11, 1866. 



I2 b 15™ 14.0 



12 16 13.0 



12 17 11. s 



12 18 IO.4 



12 19 9.0 



12 20 7.8 



No. 



Time P. M. 



Time of 150 

 vibrations. 



i.S° 



12" 29" 



5C.6 



14™ 42". 6 



160 



12 30 



55-4 



14 42.4 



170 



12 31 



54.2 



14 42.4 



180 



12 32 



53-2 



14 42.8 



190 



'2 33 



52.0 



14 430 



200 



«2 34 



51.0 



"4 43-2 





Mean . 





14 42.73 



Extreme scale readings, 



At beginning .... 56.0 — 103.0 



At end 64.5 — 91.0 



Temperature 74°- 5 



Time of one vibration . . 5*.S85 



Valparaiso, April 11, 1S66. 



12 39 



12 40 



12 41 



12 42 



M. 



No. 



1 2 s . 2 



150 



II. O 



160 



Q.8 



170 



8.6 



180 



7-4 



190 



6.4 



200 



t- r> \r Time of 150 

 1, me P.M. vibration £ 



i2» 5i-55«.o 



12 52 54.0 



12 53 52.8 



12 54 51.8 



12 55 50.6 



12 56 49.4 



Mean 



14" 42 s . 8 

 14 43° 

 14 43° 

 14 43-2 

 «4 43-2 

 14 43.0 



14 43-°3 



Extreme scale readings, 



At beginning .... 64.5 — 91.0 



At end 70.0 — S5.0 



Temperature Sl°.o 



Time of one vibration . . 5*.8S7 



Valparaiso, April 11, 1S66. 



Inertia ring on magnet. 



No. 



Time P. M 







i» 8" 6'. 



10 



1 9 22. 



20 



1 10 37. 



3° 



1 " 53- 



40 



1 13 9.. 



5° 



I 14 25-( 



2". 4 

 18. I 



33-8 

 49-4 



5-2 



21.0 



Mean 



Time of 151 

 vibrations. 



55».8 

 55-9 

 56.0 

 55-7 

 55-8 

 56.0 



iS 55.S7 



Extreme scale readings, 



At beginning .... 5S.S — 101.6 



At end 67.0 — 93.2 



Coefficient of torsion . . v = 5.50 div. 



Temperature 88°. o 



Time of one vibration . . V-il 2 



14 July, 1872. 



