102 



REPORT ON 



Horizontal Intensity. Observations of Vibrations. 



St. Thomas, November 16, 1865. 

 Inertia ring on magnet. 



N.,. Time P. M. No. Time P. M. T ^Lt 



o™ 6 s . 4 



1 18.6 



2 31.8 



3 45-1 



6 11 



I* i8 m 20 s . 5 

 1 19 34-i 

 I 20 46.6 

 1 21 59.8 

 1 23 12.9 

 1 24 26.2 



Mean 



i8 m 14 s . 1 

 18 i S .s 

 18 14.8 

 18 14.7 

 18 14.8 

 18 14.8 



18 14. 



Extreme scale readings, 

 At beginning . 

 At end .... 



Coefficient of torsion 



Temperature . 



Time of one vibration 



61.8 — 98.0 

 63-5 — 96.2 

 z/ = 5.22 div. 

 86°.o 

 7». 299 



Salute Islands, November 28, 1865. 



3 s -6 

 0.4 



44 57 



45 54 



46 51 



47 48 



57 m i7"-7 



58 14.2 



59 u-4 



8.6 



1 5-6 



2 2.5 



Time of 150 

 vibrations. 



14- 14s. I 

 14 13.8 

 14 14.0 

 14 14.4 



H 14-3 

 14 14.2 



Extreme scale readings, 

 At beginning . 

 At end .... 



Coefficient of torsion 



Temperature . 



Time of one vibration 



57-5 — 99-8 

 71.4 — 86.0 

 v = 3.72 div. 

 95°-5 

 5"-694 



Salute Islands, November 28, 1865. 



Inertia ring on magnet. 



Time I 



.M. 



No. 



11" 31™ 



9 s - S 



ISO 



II 32 



22.5 



160 



» 33 



35-6 



170 



11 34 



48.7 



180 



11 36 



1.4 



190 



11 37 



14.8 



200 



I i h 49 m 25 s . 1 



II 5° 38.6 



11 51 51 



11 53 4 



11 54 17 



11 55 3° 



Mean 



Time of 150 

 vibrations. 



i 5 *.6 

 16. 1 

 16.0 

 16.0 



16.4 

 15-5 



18 15-93 



Extreme scale readings, 

 At beginning . . 

 At end .... 



Coefficient of torsion 



Temperature . 



Time of one vibration 



54.8 — 105.3 

 65-4 — 94-0 

 v= 5.65 div. 

 9i°.o 



7 8 -3°6 



Ceara, December 13, 1865. 



No. Time P.M. No. Time P. M. ^ifo-nT 



i h 35 m 8». 3 

 1 36 6.2 

 1 37 4-2 

 1 38 1.0 

 1 38 59.1 

 1 39 57-° 



n h 49" 1 36 s .o 



11 50 34.2 



11 5i 33 



11 5 2 3i 



n 53 2S 



11 54 25 



Mean 



14" 27>.7 

 14 28.0 

 14 29.2 

 14 3°-2 

 14 29.1 

 14 28.6 



14 28.80 



Extreme scale readings, 



At beginning .... 59.0 — 101.0 



At end 45.5 — 115.0 



Coefficient of torsion . ,v= 5.40 div. 



Temperature 89°.o 



Time of one vibration . . 5 s . 792 

 A strong breeze blowing, which made the vibrations 

 somewhat unsteady. 



Ceara, December 13, 1865. 

 Inertia ring on magnet. 



Time P. M. 



No. 



I2 h 



23° 



I4».I 



150 



12 



24 



28.8 



160 



12 



21 



4V« 



170 



12 



26 



59.0 



180 



12 



28 



13.6 



190 



12 



29 



28.2 



200 



I2 h 4I m SI B. S 



12 43 6.1 



12 44 20.0 



12 45 33-6 

 12 46 49.2 

 12 48 3.8 



Mean 



Time of 150 

 vibrations. 



i8 m 37 s -4 

 18 37-3 

 18 36.2 

 18 34.6 

 18 35.6 

 18 35-6 



18 36.12 



Extreme scale readings, 

 At beginning . 

 At end .... 



Coefficient of torsion 



Temperature . 



Time of one vibratioi 



104.8 — 58.8 

 100.0 — 62.2 

 v = 7.00 div. 

 89°- 5 



7"-44I 



Pernambuco, December 23, it 



Time A. M. 



No. 



6 b $o m i6 8 .8 



150 



6 51 15-7 



160 



6 52 14.0 



170 



6 53 I 2 - 6 



180 



6 54 10.9 



190 



6 55 9-6 



200 



™- . ~ r Time of 1 <o 

 Time A. M. ., .. D 



vibrations. 



4 m 54 3 -4 



5 52.6 



6 51. 1 



7 49-6 



8 48.0 



9 46-4 



14-° 37».6 

 14 36.9 

 ~I4 37-1 

 14 37-o 

 14 37-i 

 14 36.8 



14 37.08 



Extreme scale readings, 

 At beginning . 

 At end .... 



Coefficient of torsion 



Temperature . 



Time of one vibration 



46.0 — 115. 

 62.0 — 99.O 

 ' = 4.27 div. 

 90°. 5 

 5».8 47 



