AT THE OBSERVATORY, CAMBRIDGE, MASS. 



DECEMBER 31, 1819. 



451 



A a cos. <J. Micr. 



A. in. *. i " Rev. 



Mean . . . . 31 25.40 1 96.00 58.810 



Chronometer fast 59.18 0.07 Zero, 50.035 



Sid. time . . 30 26.32 1 25.93 8.775 5 



No. of A a cos. i. Micr. 



obs, A. m. s. ' " Rev. 



Mean . . . . 44 34.66 1 7.72 56.843 



Chronometer fast 59.18 0.06 Zero, 50.035 



Sid. time . . 43 35.48 1 7.66 6.808 6 



No. of 

 obs. 



Ext. ther. 18. Observer, G. P. B. 



JANUARY 0, 1850. 



A. m. i. 

 Mean 1 9 41.50 052.27 



Chronometer fast 1 1.09 



Sid. time . 1 8 40.41 52.22 



Micr. 

 Rea. 

 55.360 



0.05 Zero, 50.026 

 5.334 



Observer, G. P. B. 



No. of 

 obs. 



20 



Mean I 53 25.92 



Chronometer fast 1 1.09 



Sid. time . 1 52 24.83 



A a cos. 5. 

 25.11 



0.02 Zero, 50.026 



Micr. 



Rev. 



47.464 



No. of 

 obs. 



25.09 



2.56S 



Ext. thcr. 17. 



