106
The late eminent hydrographer Six Edward Belcher who appears to have
mada
a
careful study of established what is known
the "Ad
these tides.
here a
"Admiralliz Datums" which is
days,
ment
in which case,
of
the tides
A
total derange
the
general
level of 5. W. monsoon Ordinar
Springs assuming approximately that
a
of
the N. E
mean datume of low water levels during Ordinary Springs of the whole
twelve mouthi
of
the
1
year.
It should
be added however that the heights both-
Above and..
below this dalum shown
in the Figure
are
siderable variation
subject to com. according
ひかん
only to the intensity of the wind but to the quarter whence it blowv. It sometimes happens for instance in the middle of the 5.15.
that after
A
few days calm the winds
will veer pounds to the North East
and keep from that quarter for a fur
days
As regards the Trage.
of
ne apo.
works, the bodes main interest will be those founds
in the Longitudinal section and) Cross sections which represent Hight Watch Ordinary Springs under the maximum strength of
............,
the N. E. mon
- soon and how water Ordinary Springs
under an
-doon
equally strong 5. W. mon
If the wind lulls in either Case, the N. E monsoon Ordinary
high tido
About
9
is reduced in height by
to 12 inches, while the 5.W. Monsoon ordinary low tide is poised
by about to inches.
The
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