242 Gould's Report on Trans-Atlantic Longitude. 
A. a. 
1866, Noy. 5, 0" 41™ 335-305 08115 
13, 33°280 0°110 
Mean, , 0 41 33°29 
This differs by —0*10 from that adopted by Mr. Airy as 
deduced from the great chronometric expedition. of 1844, and 
the telegraphic determination of 1862. 
he combination of the three longitudes thus determined, 
gives— 
; 
Greenwich—F oilhommerum, Q* 41" 83°29 
Foilhommerum—Heart’s Content, 2 51 56°54 
Heart’s Content—Calais, 0 55 87°72 
Greenwich—Calais, 4 29 17°55 
oceanic arc being diminished and the land arc increased, each by 
about 0-14.” 
The only probable influence of personal equation in the 
thr 
entire longitude-measurement, com rising, as it does, three-Six- 
the observations of Messrs. Dunkin and Boutelle. 
The longitude of Calais, as heretofore telegraphically deter- 
mined, is as follows :— 
Calais—W ashington, 0 39 4°84 
whence we have 
Greenwich—Washington, 5" 8" 125-39 
The Seaton Station being 12°44, and the dome of the ee 
tol 10°17, east of the Naval Observatory, to the center of the 
dome of which the preceding value refers, we have as their lon- 
gitudes: Greenwich— 
Seaton Station, 5” 7™ 59-05 
Capitol, ee 229 
ES Sia % 
