The Sun.
London, England, 1854-06-03 00:00:00

Marks to Clear the Corsair Rock,

In working out between the Heads, keep the flagstaff on
Observatory Point open half-a-cable's length with the low-
est part of Nepean Point, until Shortland's Bluff flagstaff
is half a cable's length open to the westward of the low
lighthouse ; which latter mark must be kept on until you
open )ut Nepean Rock to the ea.tward of that point, when
you are out clear of the rock and Nepean Reef.
In working in between the Heads, keep Shortland's Bluff
flagstaff half a cable's length open to the westward of the
low lighthouse, until you have the flagstaff on Observatory
Point half a cable's length open to the lowest part of Point
Nepean, which will lead you clear of the Corsair Rock;
but to clear Nepean Reef, which lies a cable's length in-
side the rock, do not shut in the low lighthouse with
Shortland's Bluff flagstaff until you open out the Nepean
Rock to the westward of that point, when you are in clear
of the reef.
NOTICE TO COMMANDERS OF VESSELS IN HOBSON'S BAT.
Commanders of vessels are requested to take notice, that
for the purpose of enabling them to rate their chronome-
ters, a time-ball, painted black, will be dropped daily (Sun-
days excepted), from the top of the flagstaff at Gelli-
brand's Point, at the instant of one o'clock mean solar
time, there corresponding to 15 h. 20 min. 19 sec. Green-
wich time.
As a preparatory signal, a blue pennant will be hoisted
at the masthead at half-past 12, and hauled down at 10
minutes to 1 o'clock, when the ball will be run up to the
masthead and dropped as above.
In the event of its being necessary at any time to sus-
pend the dropping of the time-ball, either from strength of
wind or any casualty occurring to the apparatus, this will
be indicated by a white pennant being hoisted instead of the
blue preparatory pennant.
Assigned position of the time-ball, lat. 37 dog. 52 min.
42 sec. 8, long. 141 deg. 55 min. 28 sec. E.

TIDAL SIGNALS.
A flagstaff having been erected at Point Lonsdale, the
following signals will be hoisted upon it between sunset
and sunrise on and after this date, to denote the state of
the tides at the Heads :

A blue flag will be hoisted half-mast high when the tide
begins'to flow in the middle of the entrance between Points
Lonedale and Nepean, which will bekept flying all the first
quarter of the flood tide.
The second quarter, a blue flag at the masthead.
The third quarter, a red flag half-mast high.
The last quarter, a red flag at the masthead.
Ebb Tide.
The first quarter, a blue flag half-mast high, with a ball
underneath.
ball
The second quarter, a blue flag at the masthead, with a
h.
The third quarter, a rod flag half-mast high, with a ball
underneath.
The last quarter, a red flag at the masthead, with a ball
underneath.

River Yarra- Yarra.
The following tidal signals will be hoisted at the fore-
mast-head of the water police hulk, moored at the entrance
of the River Yarra, to denoie the height of the tide on
the bar :
When there is eight feet water on the bar a ball will be
hoisted at the masthead.
Si feet, a ball half-mast high.
9 feet, two balls at the masthead.
9i feet, two balls half-mast high.
10 feet, a blue flag at the masthead.
10i feet, a blue flag half-mast high.
11 feet, a red flag at the masthead.
(Signed) CHARLES FERGUSON,
Port and Harbour Master.

Dec. 22, 1851,

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