MAGNETIC OBSERY A T 1 () X S. 



101 



HORIZONTAL INTENSITY. OBSERVATIONS OF VIBRATIONS. 





Philadelphia, 



:tober 24, 1S65. 





Gosport, October 30, 1865. 



No. 



Time P. M. 



No. 



Time P. M. 



Time of 156 

 vibrations. 



No. 



Time. 



No. 



Time. 



Time of 150 

 vibrations. 



o 



IO 

 20 



3° 

 40 



S° 



3 h 27 m 5 ! .6 

 3 28 17.2 

 3 29 29.6 

 3 3° 420 

 3 31 54-4 

 3 33 6.4 



Extreme sea 

 At beginn 



156 

 166 

 176 

 1 86 

 196 

 206 



[e readii 



3 h 45 ra 5°"-8 

 3 47 2.0 

 3 48 152 

 3 49 27.2 

 3 5° 39-2 

 3 51 5>-6 



iS'" 45».2 

 18 44.8 

 18 45.6 

 18 45.2 

 18 44.8 

 18 45-2 





 10 

 20 



3° 



40 



5° 



I2» I7"> 5».i 150 

 12 18 12.8 160 

 12 19 20.7 170 

 12 20 28.5 180 

 12 21 36.1 190 

 12 22 44.0 200 



Extreme scale readi 

 At end .... 



i2» 33» 58-. 8 

 '2 35 7-8 

 12 36 16.4 

 12 37 24.0 

 12 38 29.6 

 12 39 39-2 



if>53'.7 

 16 55.0 

 16 55.7 

 16 55.5 



«6 53-5 

 16 55.2 





Mean . . . 



. . . 5.0 — 



iS 45.13 



50.0 

 86.0 



Mean . . . 

 ... 70. 



16 54.77 

 — SS.3 





Coefficient of torsion v = 8. 12 div. 

 Temperature .... 6o°.7 

 Time of one vibration . 7 S .2I2 



Temperature .... 6o°.o 

 Time of one vibration . 6 s . 765 





Gosport, October 28, 1865. 



St. Thomas, November 13, 1S65. 



No. 



Time T. M. 



No. 



Time P. M. 



Time of 150 

 vibrations. 



No. 





 IO 

 20 



3° 

 40 



5° 



Time P. M. 



No. 



Time T. M. 



Time of 150 

 vibrations. 





 10 

 20 



3° 

 40 



5° 



3" 43 m 6 "-4 

 3 44 14-4 

 3 45 22.0 

 3 46 29.6 

 3 47 37-2 

 3 4S 45- 6 



Extreme sea 

 At beginn 



150 

 160 

 170 

 180 

 190 

 200 



le readii 



4* o m 3". 6 

 4 1 11. 6 

 4 2 19.5 

 4 3 27.2 

 4 4 34-9 

 4 5 42-8 



i6 m 5 7 s . 2 

 16 57.2 

 16 57-5 

 16 57.6 

 16 577 

 16 57.2 



2" 23™ 6-2 

 2 24 3.2 

 2 24 59.8 

 2 25 56.9 

 2 26 

 2 27 49.0 



Extreme sea 

 At beginn 



150 

 160 

 170 

 1 So 

 190 

 200 



e readii 



2» 37™ iS'.6 

 2 38 15-4 

 2 39 12.2 

 2 40 8.4 

 2 41 5-7 



2 42 2.S 



I4 m I2».4 . 



14 12.2 

 14 12.4 

 14 II. 5 



'4 



14 13. S 





Mean . . . 

 ... 60. 



16 57.40 

 2 — 88.8 



Mean . . . 

 gs, 



14 12.46 



2 — 98.0 



3 — 90. 2 







1 — S5.2 







Coefficient of torsion, v = 7.35 div 

 Temperature .... 73°-° 

 Time of one vibration . 6 8 . 7S3 



Coefficient of torsion, z/ = 4.io div. 

 Temperature .... 87°.o 

 Time of one vibration . 5 s . 683 



Gosport, October 2S, 1865. 

 Inertia ring on magnet. 



St. Thomas, November 16, 1S65. 



No. 



Time P. M. 



No. 



Time P. M. 



Time of 150 

 vibrations. 



No. 



Time P. M. 



No. 



Time P. M. 



Time of 150 

 vibrations. 







10 

 20 



3° 

 40 



5° 



4 h 39 m 7'- 9 

 4 40 35- 1 

 4 42 2.3 

 4 43 29.3 

 4 44 56.4 

 4 46 23.7 



Extreme sea 



150 

 160 

 170 

 1 So 

 190 

 200 



le readii 



5 h o m 55 s .o 

 5 2 21.7 

 5 3 48.8 

 5 5 16.0 

 5 6 43.2 

 5 S 10. 1 



2i">47«.i 

 21 46.6 

 21 46.5 

 21 46.7 

 21 46.8 

 21 46.4 





 10 

 20 

 30 

 40 

 5° 



12" I3 m 3 s -4 

 12 14 0.4 

 12 14 57.2 

 12 15 54-3 

 12 16 50.6 

 12 17 47.8 



Extreme sea 

 At beginn 



150 

 160 

 170 

 180 

 190 

 200 



e readin 



I2 h 27™ 15". 1 

 12 28 12.0 

 12 29 8.5 

 12 30 5.4 

 12 31 2.2 

 12 31 59.0 



14™ ii».7 

 14 11. 6 

 14 ". 3 

 14 11. 1 

 14 11. 6 

 14 11. 2 





Mean . . . 



21 46.68 

 3 — 66.5 



3 69.O 



Mean . . . 

 gs, 



... CO 



14 11.42 



3 — 9S.8 

 2 — 89.5 







88. 



. . . - - ffi. 





Coefficient o 

 Temperatur 

 Time of om 



f torsion 

 vibratio 



, v = 8.97 div. 



. . 70°.o 

 a . S 3 . 7 1 1 



Coefficient 

 Temperature 

 Time of one 



f torsion 

 vibratio 



, z/ = 4.25 div. 



■ • 87°. S 

 i . 5 8 .676 



