Plate 50 
ABB T3.EYIAT I OKS 
Meiirrmla 
Cetera 
or Shades 
OlhwqrwKtiea 
2 Y.fbrMud, 
bh. for blfuzk 
hrd,. for hard 
S. - 
Sand 
&■ - 
grey 
aft. 
soft 
e-.-- 
Gravel 
dk. - 
dark 
the. 
fine. 
Shm 
Sheds 
gn.. - 
Sfrsc.ro 
era. 
coarse 
B. . 
Pebbles 
&r. . 
brow 71 , 
Irk-... 
broken. 
^0.. 
Specks 
Ji#. « 
bla& 
rly. - 
rorJcy | 
c. - 
m. 
&. - 
tight 
sik,. »• 
The plane, of reference is Mean I.ow'Water 
■Average time of High "Wafer after Moons Meridian passage... 
Aserago time of Law ^9ater after "Moons MerMhaa passage.... 
Average height, of B3gh Water above the plane of reference... 
2 20 
.JLIffc. | 
The predicted time. and. height of die tide can H obtained thorn the TXDJ& TABLES 
published annually by the United States Coast and. Geodetic Surety. 
M/e: 
UnferfineH figures refer fi number of dredging Sfa. 
US. fir's b Commission Skeamerf/sfi Hawk /839. 
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'Iterf 40 50 TS 13 .. iyiH, >.•"' 
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KLBVATIOKS 
^ elevations are referred to high, water and are 
expressed, vn.rrid.rcs and by contour lines showing 
successive differences of 4- metres. 
BUOYS 
$ /lco’ Buoy, to be. left- in entering, on. Starboard hard 
f Black Bui>y. to be left. in. entering, on, Fort hand 
$ Black and Red horiaordaL s' tripes. .. Banger Buoy 
f Black and WhJs perpendicular stripes _ Channel Buoy 
C ■ N.-or S. signides Can ... Bun. or Spar. 
SOUNDINGS 
Ha Soundings are. expressed in feet and show the depth, at me 
low water 
The S foot curve is sho Wn. thus : - • - - 
„ 28 „ " " ” ’’ ... ... 
- IS* 29' 
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Nate - ft?# titotneJre or. WOO mams *3280.83 ft~ x&o fa, sennae yule nearly. One, statute, mite *1609.3$ metres. 
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Z/cZcZ/ZZoniS by (Z.S.frsZ) Commission Z 899 
