New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1875-09-09
MISSISSIPPI IMPROVEMENTS.
FURTHER DETAILS CONCERNING THE
JETTIES.

FURTHER DETAILS CONCERNING THE
JETTIES.
ADJOURNMENT OF THE BOARD OF ENGINEERS TO
MEET IN NEUTRALITY-SUSPICIOUS. SUCCESS
rIoys FROM NATURALIZATION OF CAPT.
EAps's METHODS.
The Board of Engineers charged with the
examination Capt Eadss plans for the Improvement
OF the mouth OF the Mississippi after the adoption OF the
report published yesterdays TRIBUNE, held another
meeting Ut the Fifth Avenue Hotel at late hour on
Tuesday and resumed the consideration OF the works at
the head of the Pass All the members present, ex
cept Gen. Alexander Capt Eads met with the Board.
After thorough consideration vi different projects the
Board recommended unanimously the immediate con-
strl,con Of jety, starting on tangent TO the east
bank Of entrance to the Pass and eurvins
thence to the westward a radius OF 5000 rect,
till it reaches the "a feet contour ne the further pro-
ongation OF this and the execution OF works on tue
west side to be left for determination aitr oDser'suoh
OF effects produced by the construction recommehueu'
The Board then adjourned and reassenbed yesterday
ut noon but, after the minutes OF ali the nieetihs hau
been read adjourned 70 meet at New-Oreans NOV ~
1878.
BY the minutes of the Board II appears-in addtOh 10
what has already been stated ia The rRIBUSE-that tne
Board recommends that the proper line for the eastward
lefty shall begin about $3.50 feet from the Land
End," and about 0S0 feet beyond the mattrass 'id
Sept l. and on the line submitted by capt Eads then
curve southwark, q radius OF 10000 feet tn the 80
feet contour line As the proper width between the
eties ut their ends, the Board recommends that
remain. as designed by Capt. Eads, ut LOCO feet al
water surface ordinary hgn tide. The members OF the
Board are unanimously OF opinion that strictly parallel
alignment OF the western jetty Is IN accoronnce
with the theory of the jetty action that departures
fsAn snch alignment would be advisable IL at all-oniy
on the ground Of economy, facility, aud rapty OF con-
structon they concur in the alignment proposed by
Capt Eads and leave this matter to his Discrimination
aided by the experience Ined the spot Az regards
the length of the jetty the Board thinks 1t de-
srable that the ern, being the wndward Jetty.
should overlap the western by at least coo feet
Capt Eads, who has since June last been engaged on
the which the engineers have just approved states
that ettes simply dykes evees under water, ana
are intended banks to the river TO prevent IT.
expanding difusing itself enters the sea-
notable fact says that where The banks of river ex
tend boldly out into the sea- bar is formed az the en-
where the banks absent, as is the case
In detaformng rivers, that the bar Is an nvariaDle
feature. TIE bar results from the diffusion OF the
stream il spreads out. fanke nm e.eF tn
remedy lies in contracting the stream or IN preventhR
TIE Diffusion gance az TIE map Oh ste e 80 s e
untl is within ABOUT 73 miles OF the bar, "nc 4 nrcc
il building and extending It's own banks nto tIie sea
the rate 0 eight inches per day IFS lesues are coln
probably never chanse ther locat,oni .oign gu, 80
tIne the veldows there fresh deposits VIII raise
them ihgaer lie points therefore, 10 the fact that the
river itself is continually employing tne Je.V sys.el
AMI tha nature maaes parallel not CONVEX sng letties
l3 les above te bar OF the SOUTH" est Pass tt
natural tties finished and narrowed 20 their normal
width feet aud there the Pass s 90 Iect deep IN
consequence Capt. EIds thinks that tle par was once
unaesnonably whore this depth OF 80 eet now exists
From this point river gradually widens cut to the
and tue current gradually diinlnisfes ron IS
feet feet per sec0nd at the BAR aud 70 zero
20 miles beyond in TIE Gull since man nae 1n0wn
bat
the ass above has been tle same 70 mics
For miles tie Pass presents the s1ne narrow
3 and depth TAe bar, says Capt Eiiats, mas mar
Sailed the way through ages past To tbs Ul1 ana the
natural eties have been built up at exactly TIE SANE
r.le speed aud haze constantly kept the Oar - mi
in advance A. the natural JeteS adV'-nce the OAR -
No7 SAYS Cipt lads suppose. that By artificial means
these natural :tie5 could be suddenly exten ;d 3 miles
out to the BAR The volume Of water would be almost
not exactly the same anu would tie current. In
stead OF passing the bar dc II now uVes at three Zee
per second, IL would pass 0ut between These ~ ncli
etcs the rate OF four feet pcT sec0n Inc cues
s, could the bar cOrn again dfter~ard nearer man
73 aes from the On OF these artificial Jetesi cuplose
there was literal Gulf stream 90 carry away
,b % IL has hecn ei,,o ut Tor the last D yes i would
take the river 10 900 days us years 10 extend It's
etIcS place they nSEed out 20 thc
present crest ii man. therefore, should do IN
three or years Will require the river l7S years
do viii be- icr the lapse OF centuries When TIE BAR
can rcappear becaJi must De located at least seven
miles be- On the artificial cties. THIS argument was
made as 20 the SOuthN Pass but applies with egua
force 10 the south Pass he is building the jettes
can't Fas further states that the perInanence OF these
ietcs viii depend mainly on tie skill ami experience OF
r cngnecrs The itself Is daily showing tGGt 1t IS
aD to construct ettics OF scdentsry matters which
transports watch are inperisnAble aud con
SANITY increasing ia strength. On Its banks
are found mIlions of young willows and pop
lars, which property formed mo hsG ,nits
stone line OF the proposed ietsis and securely hed
in position by huge blocks 0f concrete w" SOU p.ome
flied with sedmcntsry deposit and 0rni artificial JanA3
as those nature 10 daily building at tAie
pas %
rivers OF Euro q where ettics have been elective:
IN Ilruth depth,