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OBSERVATIONS 
DURING AN 
EXCURSION INTO THE INTERIOR OF MELVILLE ISLAND, 
June, 1820. 
The Longitude during this Excursion was determined by Arnold's pocket 
Chronometer No. 2109. 
The difference of No. 2109 on Mean Time at Winter Harbour having been 
carefully noted at noon on the 1st and 16th of June, it was found to have lost 
u s 
3 30 in the interval, or 14 seconds daily. 
Its daily rate for three weeks preceding the 1st of June, averaged 12.5 
seconds; and from the 16th to the end of June, 12.7 seconds. The 
14 seconds were therefore allowed as its daily loss during the Excursion ; 
which, with its original difference on Mean Time at Winter Harbour on the 
H M S H M S 
1st of June, slow 1 17 19.5, increased by 7 23 14, which is the difference 
of the Meridians of Greenwich and Winter Harbour, constituted No. 2109’s 
daily correction to Mean Greenwich Time, as entered in the Table. 
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