98 



CAPTAIN SABINE ON THE DIFFERENCE IN THE VIBRATIONS 



July 9th. Clock making 86400 Vibrations. Barom. | ^^'^g j 



29.49 



'u 



Therm. 



Times of 



DIsapp. Re-app. Coincidence. 



Arc of 

 Vibration. 



Mean 

 Intenral. 



Correction 

 for Arc. 



Reduct. 

 to 72°. 



Corrected Vibra- 

 tions in a Mean 

 Solar Day at 72°. 



1 

 11 

 21 

 31 

 41 

 51 

 61 

 71 



71.5 

 71.7 

 71.7 

 71.6 

 71.6 

 71.7 

 71.6 

 71.7 



m s 

 33 45 

 38 13 

 42 50 

 47 32 

 52 16 

 56 58 

 01 43 

 06 25 



m s 

 33 48 

 38 18 

 42 58 

 47 44 

 52 31 

 57 22 

 02 13 

 07 08 



h 



9 



10 



11 



12 



1 



2 



4 



5 



46.5 

 15.5 

 54.0 

 38.0 

 23.5 

 10.0 

 58.0 

 46.5 



1.40 

 0.95 

 0.63 

 0.45 

 0.31 

 0.21 

 0.16 

 0.11 



386.90 



387.85 

 388.40 

 388.55 

 388.65 

 388.80 

 388.85 



+ 2.23 

 + 1.00 

 + 0.47 

 + 0.23 

 + 0.11 

 + 0.05 

 + 0.03 



-0.17 

 -0.13 

 -0.15 

 -0.17 

 -0.15 

 -0.15 

 -0.15 



85955.44 

 85955.33 

 85955.42 

 85955.34 

 86955.34 

 85955.46 

 85955.50 



71.73 



85955.40 at 72' 



Table E. 



Determination of the rate of the clock by Graham, with which the pendulum 



was compared in the experiments at Greenwich between the 21st and 



26th of July inclusive : by Mr. Taylor. 



"The rate of the clock was obtained from comparisons with the transit 

 clock at the time that the observations were making for the determination of 

 the rate of the latter ; thus resting the accuracy of the results on the correct 

 determination of the rate of the transit clock, for which purpose the following 

 observations have been selected from the Greenwich observations : 



1828. 

 July 21 A.M. 



Capella 

 |3Tauri. . 

 a Orionis 



22 A.M. |3 Tauri 



23 A.M 



Observed Place, 

 h m s 



5 4 55.92 

 5 16 21.40 

 5 46 47.24 



5 16 20.98 



Aldebaran 4 26 58.62 

 Capella . . 5 4 54.96 

 Pollux. .. 735 41.04 



25 A.M. Aldebaran 4 26 57.56 



Capella . . 5 4 53.90 



Rigel 5 7 9.80 



/3 Tauri 5 16 19.38 



26 P.M. a Cor. Bor. 15 28 18.10 



a Serpentis 15 36 42.10 



Apparent Place, 

 h m s 



6 4 1.69 

 5 15 27.22 

 5 45 53.04 



5 15 27.25 



4 26 5.41 



5 4 1.75 



7 34 47.96 



4 26 5.46 



5 4 1.82 

 5 6 17.74 

 5 15 27.33 



15 27 26.79 

 15 35 50.83 



Error of Clock. Mean. 



+ 54.23 

 54 

 54 



•^^\at5'' S 



14- 54" 

 .20J ^ ^* 



Rate 

 in 24". 



23"' 

 20 



53.73 {ii„'^:-o».47 



+ 53".73 



at 5'' 42™ 

 + 53". 17 



52.10^ 



52.08 I at 4'' 59™ 



-0".55 



52.06 r+ 52".07~^"-^^ 

 52.05 J 



51.31") at 15»' 32™ „,. 

 +51.27/ + 51".29 "'^^ 



