ON THE LONGITUDE OF WASHINGTON. 



2 1 3 



h = ihe measure of precision 





</ . ami rf Q ' = the assumed longitudes of the eastern and western stations from Greenwich + when casl, — when 

 wi si of that observatory. 



(/. and </' = the concluded values of the same. 



A f/ = ne = single result for longitude of eastern from known western station. 

 ^ (/-,' = — ne = single result for longitude of western from known eastern station. 

 i = probable error of an observed transit over one wire. 



And the final result, 



I (/ = , /. [/'/' x»e] ± _j_ 



II rfW.'- rAAx "<l ±-L- 



[/»/i] |A/i]" 



The corresponding observations made at Copenhagen, Krcmsmiinstcr, Cracow and Wilna 

 have also been computed, but the results indicate errors of such magnitude in their 

 adopted longitudes, that they have not been incorporated herein. Edinburgh, Oxford, 

 Cambridge and Hamburgh, on the other hand, having been connected with Greenwich by 

 cbronometric differences, are regarded as equally well known with that observatory, and 

 every corresponding observation has been calculated and included howsoever discordant 

 its results. 



I OL. \. — I I 



