AT THE OBSERVATORY, CAMBRIDGE, MASS. 



JANUARY 10 and 11, 1850. 



447 



Remarks. 



The star is south of Mara, and is the same as used for micrometer measurements of the 10th p. H. 



Observer, W. 0. B. 



h. m. B. 



Mean by first wire 10 12 53.55 



Chronometer fast 1 0.70 



Sid. time 10 11 52.85 



Aa. 



t. 



18.14 



No. of 



Ol.s. 



