121 



" The next Table, No. II., contains the mean hourly mo- 

 tion and azimuth, calculated from the theory of M. Foucault. 



Table II. 





M. Foucault. 



Hour. 





Hourly Motion. 



Azimuth. 



I. 



12° 



12° 



II. 



,1 



24 



III. 





y 



36 



IV. 





» 



48 



V. 





y 



60 



VI. 





9 



72 



VII. 







84 



VIII. 





j 



96 



IX. 





, 



108 



X. 





J 



120 



XI. 





y 



132 



XII. 







144 



XIII. 





9 



156 



XIV. 





y 



168 



XV. 





» 



180 



" A comparison of Tables I. and II. shows that M. Fou- 

 cault's azimuth appeared to fall short of observation during the 

 first, second, and third hours ; that it agreed with observation 

 during the fourth and fifth hours ; afterwards exceeded the ob- 

 servations, until, at a period occurring during the twelfth 

 hour, it again coincided with the observed azimuth ; became 

 deficient again during the thirteenth, fourteenth, and fifteenth 

 hours ; and coincided with observation in the early portion of 

 the sixteenth hour. 



" If M. Foucault's azimuths be compared with the observed 

 azimuths at the end of every three hours, the agreement will 

 appear more close. 



