AT THE OBSERVATORY, CAMBRIDGE, MASS. 



NOVEMBER 30 and 31, 1849 Continued. 



A a co?. $. 



449 



Micr. No. of 

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



Mean . . . . 10 18 39.60 3 45.48 22.29S 



Chronometer fnst 1331.00 0.14 Zero, 50.000 

 Sid. time . . . 10 5 18.60 3 48.34 27.702 10 



Ext. ther. 30. 



A a cos. I. 



i n 



Micr. No. of 

 Rev. obs. 

 20.670 



h. m. t. 



Mean . . . . 10 38 24.50 4 48.43 



Chronometer fast 1321.00 0.15 Zero,50.000 

 Sid. time . . . 10 25 3.50 4 48.28 29.330 10 



Observer, G. P. B. 



DECEMBER 11 and 13, 1S10. 



h. m. s. 



Mean 11 48 26.09 



Chronometer fast 57.08 



Sid. time 11 47 29.01 



Ext. ther. 17. 



A a cos. 6. Micr. 



' " Rev. 



3 56.18 25.900 



0.21 Zero, 50.000 



3 55.97 24.100 



Observer, G. P. B. 



No. of 

 nbs. 



DECEMBER 12 and 13, 1819. 



Remarks. 



The position circle for these observations was set, by inadvertence, at 183' 53' instead of 180' 0'. The measured distance must be diminished by 

 1",80 for the true value. 



Observer, G. P. B. 



57' 



