, 1877-04-17
But the Supcrstructure Would De De-
cidcdly Improved by Pro-
lection.
81 the Water-supply Is safe Enough, but
the 0rib-Keeper May Come
to griof.
The Cnuvsssing Of the voto Cast at
the Recent Election Begun.
ftt StYenth Ward 1fder1nanlt DaxIntss Sent to The
judiciary Committee and Corpora
ton Counsel.
THE CRIB.
EEanT nH 1EN. HMTTlf.

The Fiunnca Committee, 10 whom was referred
the matter Of tho condition Of the crib, reported
that they had employed Gen. sooy Smith, tho ma
ttns engineer, and two submarine diveEb, who had
visited the crib In company With the Committee,
and mado tho necessary examinations. Attached
10 the report Of tho Committee was the following
communication from Gen. Smith:
"7o HI Honor ,ths Mayor and fAt Finance
Visited Ind thoroughly inspected ihe CRIB ptoteet
lng ths inle!s of hs tunnels y Mich :uppy Tho CIV
seai Its s a. Ia a:s;ass ass
Fss fssss t5e :; whom III 5:s,oas3 -
he 1s:ali, oi their in:pcstlen ha,e tho honor ts
tS plans md e hs e1S son.nee n
strength, of ihe structure, and the iorec Of Tho
Ss ,9sTs aS e he results Of the '1an"4
Then follow. = dcicriptIon Of tho crib. A. taken
frq The eshh nana Of hn ST EnEnes
7nn rxrza,Escs"
above referred to Is related ~ follows q Storm
having occurred during tl,s placing Of the crib IN
position. and while the contractors wero engaged
in hllEng tho compartments Of tue brcakwatns with
,,.Ihi. ;!qrm , continued fos thtss days, ~!
xss Itp. Il ~stf to iii i with watei, .Ss s!snss
ssa'ed % pereept!Sle Of H. s,b III angie:
To- %s s sas fs, s: ssf Ss
tho storm was over two Of tho inner angle:
liz sn1s ass ePs BAD ro.led % sa o wnd
and wave thirteen fcct and The northwest
snsls va 'hse and onehs ect lever hsG the
been in restoring ttt crib TO Its exact poasson nnd
The fear TINT there might be smother storm mean.
necessary IN tho line 81 tho tunnel va, Of 10 ptac:
ths .sfirton q ths s.des Of the ssb from rcrpea:
dcular. though constant eJc sorr, d!l not affect
w. proessdei VIII % !: ia,s ~ :. Il. ss"sf.sters
could. and a'nce II was completed, abuat tho
n as IL. G po.oss IT. Il. .ass,s sss hs ss'sysf sysf
!imes Is during severe stoTms and when
IFS ee nEa1.t 9he es oees:ons,
pted Win i fearful noise. a. aueh tIn,oa The crit
plow moving through she iee. On several oecas
sons the broken masses lodged In tho sonth sidc VI
nna 1.achis from ,hs botc,n Of tho iaEv 10 len % q
A!tesM fevt nboys ths surface.
n assn ri ~ sRa 81
IN pos!tiun Reproduced hero In order that tho
plan et j; ee,.!t,et,en n,, b sns;.So.l and
subjected and the fosces which 1t Ina to scafst.
THK TWO OBSTRUCTIVE AGENCIES
destroy tho ctb, ars ,co md ws,o.acsion. aud Il
II with these that must deal In tho present dis.
s sa a9s esa u
newetI as nften NJ this may. pr0ve ncceA4asY. Tho
Ice Ct Mass. tasy EYER f.troy ths s.b nay do
ssk ~ Il Se1s f. !sSs i: es s's s
T.; AZ. " no; :s!z z,si b. upsa ts's 'saF Fs.s e
@ teas easns Through Z" sso 'ee sho sspsfenss
q the nlns wlnsst@ during which It l,a. .tsea
esn
leo aad waye action In tha Isri Of 1aks lilchxan.
s s u sf' my sdssssy nss ;fsn fsss
tho Ice .Gslds and 1adues them Is harmless itag.
mcn.s. The !co.ded. driven ly winds which asc
.ni ass ea through y the et5 when ny strike IT,
set forth In the description already auotea.
..'Ths WauRosh.ncs lght.hoase. aandlne two
and half mica FROM .horc " llo Western IN.
CRIB Inst was abont 100 feet squa1c, and which
VIVA sth9et .ny protection fgr .%tsTty ysss
all this tins, though frUn the RrGntcr thickness u
sesefa than i !. likely t. y IL W. vicinity q 80
CRIB Tho Injury from The cutting acffon Of tho
q repaired. The inferior construction ol. tho
ons under discussion: The NUMEROUS piles Gun.
a.ractod by the United Suites En9inceFs In tho
be cited ~ examples to proyo ito suulcisney oi
!hs.s structure. 10 ses'st tho Ice action to which
they ste exposed
s'The greatest height Of sea- waves, ~ given BY
soors.1y, T. fstty:ta5ss s ret Tleis Greatest
to specd Of about aftY feet per tecoad titanknel
and tho greatest toscs 81 wases o. obaerycd BY
Thomas Stevenson at skerryyoss Light. .liouss dur.
~st II m 4
crib probably does not sxeusd len feet, but w viii
ASSUME 1t to be 1ftccn feet. ThA corresponds with
cd OF forty. fire feet second, CFn{nea
BY Rankino.s !ute tot tha ye!oclty Of waves where
tho length Of lho wave. Ii W uao hI4 rule ~ the
speed OF wases In deep water. VIZ shall yet
aa sah : ssss a:S ~
similar n .hs forms of thets er9s*..ectiona. Thu
slFsht nascnfasy n ts s.annp!on IT. y unfs.o,abis II
Determining in tha way tic muse. ot the waves,
and having their .sloet!es and ths force Of tho
on tbc principle that lhe forces Of lhe waves are
Rsopottiona!to shsI. ma.;e. INTO the squares o.
" 525 pounds per square foot a. the folce Of a
isks.wsss h'teen feet high. II Il nut pretended
Get;ef thsn IN ' ~ spprssinstoa but t. NUT h X
noted that !ta inaccuracies all ttnd to giro us Z
,ays1 ntes4 et smaller s..nt lor ths toaee q
l.ke Il DC proportion q 81 e as as, which
gi,es the s.wAyr greater strength than lakB'
Wa,a having tbs same magn!tuda ana velocity.
That b.h pounds per sauase foot Ia ncsrspP1o1l
conyIneedb " Observations when have made o.
the movement Of ma.ssa Of stone BY the lake
Mnscs different points Vn The lakes. particularly
Al WsugosLance, Mich, and Usweyo, Ny. Bu
for greater safeay a tue concluslon cached BY tht
pEeaelt dscukAl1n let 1t BE- assumed that thls uHc<
u nearly double Rho above amount, or ], O0t
POUNDS per square foot,
THE hkstHTAHCk.
t'And let ~ suppose that the wave approaches th.
crib On linc bsccttnS ons u IL angles. aat
stEkrs p!lnu surface. which rcpscssutS The yer.
tical ctuss section oI tho crib taken through th.
two angles a4 luecns to tAEs oue. Thts panr sur
fses will bs VI feet tn 1ength, and 1t VIII tsecis,
The ahuck Ut The that puftlon OF IT. surfac
which ez1enda fran, horizontal llus ~ fset abov
to ons ~ feet tslow wateE.suEttce. lhe arcs O
the sufface struck will therefore 10 l61Dl feet,
l. Id5 square fctt sud ths totsl fotce ot the blow
viii! oe equal u l. :.u5 multiplied ~ ], 600 pounds
or j. 3d5. Uoo pouuls; which lcnds to oreFtnm th
crib shout tho side which l. parallel with tho ~
suned plane Of Impact. The horizontal ceutrellhs
the wave will he Ut ns nea! the wsteF-alftace, an
Il We suppose IL <ntlrs fofce concentrated upo
this lDs IL lever.A1m will Ga thirty fuus feet, y