346 
ME. WAEEEN DB LA EUE ON THE 
was made, an assistant at each of the marks held a lantern near it, so that being illnmi- 
nated I might see it with the theodohte and thus be enabled to make signals to them 
for the permanent adjustment of the marks, which was successfully accomplished. The 
following day being Sunday, no work was done ; but on Monday Mr. Peestox volun- 
teered to aid me in projecting my meridian towards the station of the Astronomer Royal 
at Pobes. Using, as a signal flag, a bed sheet, which was not at all larger than was 
necessary in order to be well seen, I was able to direct Mr. Peeston where to erect a 
staff with a similar appendage, in the line of my meridian, towards the north, and at a 
distance of about seven mUes from Rivabellosa. Mr, O. Steuve, as I before said, visited 
us on the 16th and undertook to work out the geodetic survey, which it was agreed 
should be made to connect the Pobes and Rivabellosa stations. 
July 14. Observations of a Scorpii and ^ Herculis, when reduced, showed that at 
16 hour 28 min. 
Leplastrier 2915 was fast of local sidereal time . . . . 11 min. 1’7 sec. 
The weather afforded no other opportunity for star observations for longitude deter- 
minations until the night of the 18th, when I was too miich fatigued to avail myself of it. 
July 16, Oh. A transit of the sun showed that 
Frodsham 3094 was fast of local mean time 11 min. 49-9 sec. 
July 20, 0 h. A transit of the sun showed that 
Frodsham 3094 was fast of local mean time 11 min. 41*5 sec. 
July 20, 8 h. 0 min. sidereal time. The transit of the sun being 
observed simultaneously with the sidereal chronometer, showed that 
Leplastrier 2915 was fast of local sidereal time .... 9 min. 55*8 sec. 
From the foregoing observations are derived the following results. 
Frodsham No. 3094. 
.July 12 th 
.July 14th 
•July 16 th 
July 20th 
East of Eivabellosa, 
Daily rate. 
Error on Greemdch mean time 
mean solar time. 
estimated by comparison ■with 
Frodsham 9768. 
h m sea 
sec. 
sec. 
0 11 51-9 
Losing 0'3 
Fast 8-3 
0 11 51*3 
Fast 7*4 
0 11 49-9 
Losing 0‘7 
Losinsr 2T 
Fast 6‘4 
0 11 41-5 
whence the Longitude was West of Greenwich 
July 12 . 
m 
. . 11 
sec. 
43-6 
July 14 . 
. . 11 
43-9 
July 16 
. . 11 
43-5 
Mean 
. . 11 
43-7 
Taking Dr. Winnecke’s estimate of the error of Frodsham No. 3094 on the 16th, 
namely, 7*5 seconds fast of Greenwich, we get for the longitude 
West 11 min. 42-4 seconds 
