ON THE LONGITUDE OF WASHINGTON. 



223 



Twelve corresponding observations of the second limb, the mean resulting correction 

 from which, by weight, is 



— l' .87. 



Eighty-one corresponding observations of both limbs, giving a mean correction, by 

 weight, of 



— 5 s .03. 



RECAPITULATION OF FINAL RESULTS. 



And the error in the assumed longitude derived from the three hundred and ninety-four 

 comparisons is 



— 1" .00, 



or the old naval observatory on Capitol hill, was in longitude 5* 08 m 00' .0 West of 

 Greenwich. 



