.774- N. W. by W. and S. E. by E. The N. W. coaft of this ifland
■ _Aag,llt- ■ wc only viewed at a diftance; therefore the chart in this
wrinef. }»• part may be feu}ty fo far as it regards the line of the coaft,
but no farther. The diftance from the fouth end of MaTli-
collo to the N. W. end of Sandwich Ifland, is twenty-two
leagues in the direction of S. S, E. i" E.
In the fame direction lie Erromango, Tanna, and Anna-
tom. The firft is 18 leagues from Sandwich Ifland, and is
twenty-four or twenty-five leagues in circuit. The middle
of it lies in the latitude o f i8° 54', longitude 169° 19' E., and
it is o f a good height, as may be gathered from the diftance
We were off when we firft faw it.
Tanna lies fix leagues from the fouth fide of Erromango,
extending'S. E. by S. and N. W. by N., about eight leagues
long in that direction, and every where about three or four
leagues broad.
The ifle of Immer lies in the direction of N. by E. f E.,
four leagues from Port Refolution in Tanna; and the ifland
of Erronan or Footoona Eaft, in the fame direction, diftant
eleven leagues. This, which is the moft eaftern ifland of all
the Hebrides, did not appear to be above five leagues in circuit,
but is of a confiderable height and flat at top. On the
N. E. fide is a little peak feeminglv disjoined from the ifle;
but we thought it was connected by low land.
Annatom, which is the fouthernmoft ifland, is. fituated in
the latitude of 30° 3', longitude 170° 4, and S. 30° Eaft, eleven
or twelve leagues from Port Refolution. It is of a good
height, with an hilly furface; and more I mull not fay of it.
Here
Here follows the lunar obfervations by Mr. Wales,.for
afcertaining the longitude o f thefe iflands, reduced by the
watch to Port Sandwich in Mallicello,
and Port Refolution
in Tanna.
1774*
Augult.
Wednef. 31,
P o r t
Sandwich,
P o r t
R esolution.
2 Ditto, -
- 20 Ditto, -
i Mean of thofe means, i ■ TMean of 20 fets of oBfe
I - - 5 Ditto,
j - - 20 Ditto,
| Mean of thefe means
L
after
i 6 16j8'° 562' 33V' t ] 167 37 t 52 57 i
167 57' 22 4
169 37 35 ' 169 48 48
169 47 22
169 44 3.5 ..
>E. Long.-
It is neceffary to obferve, that each fet of obfervations confining
of between fix and ten obferved diftances of the fun
and moon, or moon and ftars, the whole number amounts
to feveral hundreds ; and thefe have been reduced by means
of the watch to all the iflands ; fo that the longitude of each
is as well afcertained as that of the two ports above mentioned.
As a proof of this I lhall only obferve, that the longitude
of the two ports, as pointed out by the watch and by
the obfervations, did not differ two miles. This alfo Chews
what degree of accuracy thefe obfervations are capable of,
when multiplied to a confiderable number, made with different
inftruments, and with the fun and ftars, or both fides
of the moon. By this laft method, the errors which may
be either in the inftruments or lunar tables, deftroy one another,
and likewife thofe which may arife from the obferver
himfelf ; for fome men may obferve clofer than others. If
we confider the number o f obfervations that may be obtained
in the courfe of a month (if the weather is favourable), we
lhall