92 CAPTAIN SAM^^k'tHE DIFFERENCE IN THE VIBRATIONS 



For the rate of the transit clock the following observations have been selected 

 from the Greenwich Obsei-vations. 



1828. 



May 1 5. Castor. . 

 Procyon . 

 Pollux . . 



17. Sirius . . 

 " Castor . . 



Procyon. 

 Pollux . . 



18. Castor. . 

 Procyon 

 Pollux . . 



• 



19. Castor. . 

 Procyon 

 Pollux . . 



Observed M. 

 h m s 



7 24 8.57 

 7 30 49.34 

 7 35 18.54 



6 38 4.06 



7 24 7-34 

 7 30 48.06 

 7 35 17.44 



7 24 6.80 

 7 30 47.64 

 7 35 16.84 



7 24 6.44 

 7 30 47.33 

 7 35 16.64 



18. y.') 19 38 36.68 

 a VAquil3el9 42 55.22 

 |8 J 19 47 23.62 



19. y^ 19 38 35.96 

 a J>Aquil8el9 42 54.52 

 |8j 19 47 22.98 



Apparent M. 

 h m s 



7 23 37.76 

 7 30 18.68 

 7 34 47.85 



6 37 34.41 



7 23 37.74 

 7 30 18.66 

 7 34 47.83 



7 23 37.73 

 7 30 18.65 

 7 34 47.82 



7 23 37.72 

 7 30 18.64 

 7 34 47.8I 



19 38 7-36 

 19 42 25.85 

 19 46 54.27 



19 38 7.38 

 19 42 25.88 

 19 46 54.30 



Error of Clock. 



+30.81^ 

 30.66 } 

 30.69 J 



Means. 



at 7'' 29'" 

 +30».72 



Rate in 

 24 hours. 



+29.65 -V 



29.60 (at 7'' 17'" 

 29.40 r+29'.57 



29.61 J 



+ 29.07" 

 28.99 

 29.02, 



+28.72- 

 28.69 

 28.83 



at 7'' 29"' 

 ' +29\03 



at 7'' 29"^ 

 ' +28^75 



—0.58 



—0.53 



■0.28 



29.37 ^ 

 29.35 



+ 28 58 

 28 64 

 28 68 



f +29^35 



\atl9i'4£ 



J +28^7 



43"' 

 3 



—0.62 



In addition to these, we have the following obsei-vations of the Sun. 



1828. 



May 14. 

 16. 

 18. 

 19. 

 20. 



Observed M. 

 m s 



25 

 33 

 41 

 45 

 49 



22.93 



15.85 



11.00 



9.76 



8.59 



Apparent M, 

 m s 



24 51.10 



32 45.20 



40 41.50 



44 40.40 



3 48 39.90 



Error of Clock, 



+31.83 

 30.65 

 29.50 

 29.36 

 38.69 



Kate in 

 24 hours. 



-0.59 

 — 0.57 

 -0.14 

 —0.67 



Collecting the results in the two preceding tables, we have, 



May. 



Means 



15tol6 



—0.58 



—0.59 



-0.58 



16toi: 



— 0.58 



—0.57 

 -0.57 



17tol8 



— 0.53 



-0.67 



— 0.55 



18tol9 



—0.28 

 — 0.62 

 —0.14 



—0.35 



19to20 



^0.67 

 -0.67 



By Castor, Procyon, and Pollux. 

 By Sirius, Castor, Procyon, and Pollux. 

 By Castor, Procyon, and Pollux. 

 By y, a., and /3 Aquilac. 

 By tlie Sun. 



\i; ■; 



i) 



