II
2 8 ( 3 AP l ' E H D I X .
time of high water. Both cannot be right: but thinking the latter
correct, I have preferred it. In Bass Strait it is high water at about
ten. Between the two extremes there are thirteen hours, andbetween
the times of tide there are eleven, or thirteen hours: At Amsterdam
Island, high water is taken as two hours after that of Bass Strait,
but the difference of meridians is about four hours. The difference
between the high water of Amsterdam, and Blanco Bay, is nine hours,
and their difference of meridians is about nine hours.
In 30° S. it is high water on the African coast at t^vo, and on the
American coast at six. There are about four hours difference of
meridian between them in that parallel.
In 20° S. it is high water at 3h. on the African shore, and 6h. on
the Brazilian ; the meridian distance is about three hours and three
quarters.
In 10° S. at 3h. 15m. on the east side and 7h. on the west: the
distance is about three hours and a quarter.
On the equator we have 4h. 30m. at the eastern limit, and nearly
8h. at the western; the distance being about three hours and a half.
In 10° N. 7h. and lOh. the distance being three hours.
Tn 20° N. at Cape Blanco, at about lb. j and on the north coast
of San Domingo, nearly at l lh. The interval is about 3.40 : but
there are interfering derivative tides, probably, as well as local peculiarities,
among the West-India Islands.
In 30° N. about 4h. on the east and Ih. 30m. on the west. The
distance is nearly five hours. This seems anomalous.
In 40° N. 3h. on the coast of Spain, and at about lb. on the coast
of America. This is another anomaly : but easy of explanation.
In 50° N. it is high water at 4h. 36m., in the mouth of the channel
; and at lOh. 45m. on the coast of Newfoundland. Their meridian
distance is about 3.20.
On the west coasts of Ireland and Scotland, from 5h. to 6h. is the
hour of high water; on the coast of Labrador, it is from lOh. to
l l h . , in the same paraUels. The meridian distances are from three
to four hours : but as we approach the parallel of 60° N. the North
Sea and Davis Strait open, which probably affect the tide between
Ireland and Labrador.
Tlie Indian Ocean appears to have high water on all sides at once,
though not in the central parts at the same time. Thus, it is high
water at the north-west extremity of Australia; on the coast of
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