407
Knowledge of these points is absolutely
necessary.
I therefore made arrangements to remedy This deficiency. Thanks to the Kindness of the Officer in change of the naval Yard I
was able to set up a simple gauge at the
Wockyard Fier and to obtain a series of
half-hourly readings night and day,
extending over three months.
I also addressed several letters to the
government on this point, and arranged for the continuance of the observations,
and for the transmission of the results to
me, but since my departure I have heard
no
more about them.
I also obtained from the manager of
one of the private work Companies, a set
of hourly observations for the whole year 1881. A superficial examination of these data
convinced me chat, contrary to local opinion
the
the tides of Hong-Kong harbour could be
predicted with, accuracy
time. The only doubt was,
Boch
as to height and
whether the obser
-vations in my possession extended over a
sufficiently long period of time.
After consulting Sir William Thomson
and General Strachy, Ireferred the observations
to Mr Roberts, of the hautical almanack Office,
who has calculated and predicted the tides of
the Indian Ports, and he informs me that,
from the data now before him, he can predict
the tides
of
next or
other
with
any
year
satisfactory accuracy; both the times of sigh
and how water and their heights. I append
a copy of his letter to me.
The Surveyor General, I believe, concurs
with me in saying that this information will
вить
of
the greatest value to him, not alone for the preparation of drainage projects, but in the construction of sea walls and
marine
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