1793. On the 25th of february Mr. Whidbey obferved the immerfion o f
/ Jupiter’s firft fatellite, this gave the longitude, - 203° 52' 15"
differing 7' 43" to the weftward of the longitude by Captain
Cook, and correfponding with that deduced by Mr.
Bailey from two eclipfes.
Latitude of the obfervatory by fix meridian altitudes of
the fun correfponding with Captain Cook’s, - 1 9 2 8 1 2
The following lunar obfervations for afcertaining the
longitude were made for the purpofe o f fhewing the
agreement between our inftruments and thofe of Captain
Cook.
Mean of thirty-two fets taken by Mr. Whidbey, - 204 4 2 1
Ditto twenty fets taken by myfelf, - 203, 52 27
Ditto fixteen fets taken by Mr.-Orchard, - 203-51 52
Mean of the above fixty-eight fets colleftively taken, 203 57 54
But allowing the longitude, as fettled by Captain Cook,
to be 204°, Kendall’s chronometer in that cafe appeared
to be faft of mean time at Greenwich at noon on the
4th of march, -
And gaining per day at the rate of,
Arnold’s on board the Chatham, faff of mean time at
Greenwich, - - - -
And gaining per day at the rate of, - -
Arnold’s No. 14, faff of mean time at Greenwich,
And gaining per day at the rate of,
Arnold’s No. 176, ditto ditto
And gaining per day at the rate of, - - - t ;
Earnlhaw’s, ditto ditto
And gaining per day at the rate of, -
The variation by four compaffes in thirty-one fets,
of azimuths, differing from 50 47' to 9* 47', gave the
mean refult, - - - - ■,
l h 42' 27" 23"
- 8 52
5 11 58 23
3& 59
1 24 ' 20 23
*5 29
3 42 14 23
43- 37
1 22 36 23
.17 2-2
' H i f
The
The vertical inclination of the magnetic needle, ’ 793-
® , March,
Marked end, North face Ealt . . . 42° 35' 1__ ,_
Ditto ditto Weft - - - 43 ‘ 3°
Ditto South face Eaft - - ■ 40 52
Ditto ditto Weft - - - . 38, 40
.Mean inclination of the marine dipping needle,. . - 41 24
Z 2 CH A P T E R