348 
ME. WAEEEN DE LA EUE ON THE 
The foregoing numbers are not so accordant as I could desire ; but they are, I 
believe, as good as could have been obtained with the instrument, particularly under 
the circumstance of its continual exposure to the sun during its employment in the 
day-time. 
Elevation of the Station. 
Before leaving Bilbao on the 1 0th, the aneroid barometer was read off, when it stood 
at 30‘019 in., temperature 71° Fahr. On arriving at Eivabellosa it indicated 28'473in., 
the temperature being 65° Fahr. With these numbers I estimated the height to be 
1481 feet above the ground floor of Mr. Vignoles’ house at Bilbao, which is several 
feet above the mean sea-level. 
Mr. Preston, however, was so kind as to connect my station by levelling with a 
normal point on the railway, and made its height to be 1572 feet 4 inches above the 
mean sea-level. 
Recapitulation. 
The geographical position of my observatory at Eivabellosa was, therefore. 
Latitude N. 42° 42', Longitude W. 11 min. 42‘7 sec., 
and its height above the mean high-water mark 1572 feet 4 inches. Mr. Struve has 
communicated to me that the geodetic connexion of Eivabellosa and Pobes showed the 
geographical position of my observatory to be 
Latitude N. 42° 43' 24", Longitude W. 11 min. 41’3sec. 
Lastly, I estimate the error of the mean-time chronometer, Frodsham No. 3094. 
July 18th, 0*', to have been 4*6 seconds fast of Greenwich mean time, by assuming a 
progressive increase in its losing rate from July 16th to July 18th, and taking the mean 
between Dr. Winnecke’s and my own estimate for its error on July 16th. 
After the return of the expedition, Mr. Carrington kindly made some extensive 
calculations to admit of a direct comparison of my observed results with the demands of 
theory. To Mr. Farley I am also much indebted for special computations of the moon's 
position in respect of the sun’s, in a form the most convenient for comparison with 
measurements hereafter to be mentioned. 
Abstract of the Results of Mr. Carrington’s Calculations for Rivabellosa. 
Assumed position of station : — 
Geographical latitude 42° 42' 
Longitude W. of Greenwich ll"" 42®’7. 
Height above sea-level 1572 feet. 
Whence the following elements : — 
Geocentric latitude =42° 30''5. 
Log. distance from earth’s centre . . . 9'9993676. 
The true positions of the sun and moon are those of Le Verrier’s and Hansen’s 
