108 



REPORT ON 



Horizontal Intensity. Observations of Vibrations. 





Set No. 2 



November 2, 1866. 





Set No. 5 



November 2, 1866. 





Inertia ring on magnet. 







No. 



Time. 



No. 



Time. 



Time of 150 

 vibrations. 



No. 



Time. 



No. 



Time. 



Time of 150 

 vibrations. 



o 



6" 17"° 250.3 



ISO 



6" 39™ 46'. 8 



22 m 21A5 







gh jm 22 s. 7 



ISO 



gh 24m 448.2 



I7»2i=,5 



IO 



6 18 55.2 



160 



6 41 16.2 



22 21.0 



10 



8 8 32.2 



160 



8 25 53.7 



17 21.5 



20 



6 20 24.2 



170 



6 42 45.7 



22 21.5 



20 



8 9 41.7 



170 



8 27 3.2 



17 21.5 



S° 



6 21.54.0 



180 



6 44 14.8 



22 20.8 



30 



8 10 51.2 



180 



8 28 12.7 



17 21-5 



40 



6 23 23.7 



190 



6 45 44.2 



22 20. 5 



40 



8 12 0.7 



190 



8 29 22.0 



17 21.3 



So 



6 24 53.0 



200 



6 47 13-7 



22 20.7 



So 



8 13 10.2 



200 



8 30 3'-7 



17 21.5 





Mean .... 



22 21.00 



Mean .... 



17 21.47 





Extreme scale readings, 





Extreme scale readings, 





At beginning .... 58.9 — 100.8 





At beginning .... 58.7 — 99.3 













Coefficient of torsion . . w= 7.58 div. 





Coefficient of torsion . . v = 6.05 div. 













Time of one vibration . . 8 s . 940 





Time of one vibration . . 6 s . 943 



Set No. 3. November 2, 1866. 



Set No. 6. November 2, 1866. 



No. 



Time. 



No. 



Time. 



Time of 150 

 vibrations. 



No. 



Time. 



No. 



Time. 



Time of 150 

 vibrations. 







6" 57 m 4i s -3 



ISO 



7 h i S m 3.. 2 



17™ 2i 3 .9 







I2 h 3i m 58 8 .2 



150 



12" 49 m 5i s .2 



17m 533.0 



10 



6 58 50.8 



160 



7 16 12.8 



17 22.0 



10 



12 33 9.2 



160 



12 51 2.5 



17 53-3 



20 



7 0.2 



170 



7 17 22.3 



17 22.1 



20 



12 34 21.0 



170 



12 52 14.2 



17 53-2 



30 



7 1 9-8 



180 



7 18 31-5 



17 21.7 



30 



12 35 32-7 



180 



12 S3 25.7 



17 53-° 



40 



7 2 19.0 



190 



7 19 4i-o 



17 22.0 



40 



12 36 44.0 



190 



12 54 37-2 



17 53-2 



So 



7 3 28.8 



200 



7 20 50.5 



17 21.7 



50 



12 37 55-7 



200 



12 55 48. 7 



17 53-o 





Mean .... 



17 21.90 



Mean .... 



17 53-12 





Extreme scale readings, 





Extreme scale readings, 





At beginning .... 54.2 — 104.5 





At beginning .... 59.5 — 99.0 





At end 63.2 — 94.9 





At end 65.5 — 92.0 













Time of one vibration . . 6 s . 946 





Time of one vibration . . 7 s . 154 





Set No. 4. November 2, 1866. 





Set No. 7. November 2, 1866. 





Inertia ring on magnet. 





Inertia ring on magnet. 



No. 



Time. 



No. 



Time. 



Time of 150 

 vibrations. 



No. 



Time. 



No. 



Time. 



Time of 150 

 vibrations. 







7 h 26 m 1 8 s . 3 



ISO 



7" 48" 39».o 



22 m 20 3 . 7 







i" 3 m 23 s - S 



150 



jh 2 6 m 22 s . 7 



22 m 59 s . 2 



10 



7 27 47-7 



160 



7 So 8.5 



22 20.8 



10 



1 4 55-2 



160 



1 27 54.2 



22 59.0 



20 



7 29 17.2 



170 



7 Si 37-9 



22 20.7 



20 



1 6 27.5 



170 



1 29 26.7 



22 59.2 



30 



7 30 46.7 



180 



7 53 7-3 



22 20.6 



30 



1 7 59-2 



180 



1 30 58.5 



22 59.3 



40 



7 32 16.0 



190 



7 54 36-7 



22 20.7 



40 



1 9 31-3 



190 



1 32 30.2 



22 58.9 



5o 



7 33 45-5 



200 



7 56 5-8 



22 20.3 



5o 



1 11 3-2 



200 



1 34 2.5 



22 59-3 





Mean .... 



22 20.63 



Mean .... 



22 59-iS 





Extreme scale readings, 





Extreme scale readings, 





At beginning .... 56.5 — 103.6 





At beginning .... 58.2 — 101.0 









At end 68.0 — 97.2 













Time of one v 



bratio 



1 . . 8=.938 







Time of one v 



bratio 



1 . . 9 B -i94 





