, 1869-07-12
THE GREAT COUNCIL RLUFFs
!. : = BRIDGE. -.
Deta1Ia' Of its Constxucslun-Rl1n u
OBSERVATION-DISCLOSURES Cd 0falnk1AE tAe
;. F&eK4-8x1dgo Fo<s0nA8s4 -

Foupdatten-neaho e1sInktaK 1A<
T. Rte1s-Rx4dgo. .RoeH0nAis~ = j,
+ Esps IL 'coaaea H.Js 6oaparss1. suly TO-,
Th1 progress ut bnlding tho great bridge Ac.oal
&nd No hsy1 received frequent rcqueaa Ior d:
|. t1lla We 1nuK Ego e1naniled tho enttfu n0ttnnI
q our paper o@tatnlns taese facsar hus 8 10
Jon se ttn All ns to rfme, id d famsn1 of M
promtse, E1vo It in this Issue We do not x1ita fot
~ ~ . in{HHss1@ q mose rcIdiaS ta Com.
much nue. hss @ ZEE saa 4 tasss cosanaa. M lrp@
operntouA on the ground. Several month"; h4ye
the nE1rge proper viii rest This Is wrongh tsou
10 eonhtfie Strength md oondensas of surface,
30 ns 70 prevent lnjury by hIgh wiuds to which II
would ei1erwise b. eiposed :! 4 ereas eiststto1
be two hundred md nlti feei long, and vii rest
on lron coluinns, patr Of each, Which Knf form ,
aaad a taif feet Ia di.metes, vim 1aicfnsss
cylinders are Irom eishs to ten. ieet high
lnside ncngee Tho lower eectlon Of each cotulap
has no nange on l,s bottom. Each .patr OF col
@ pnn. eoDstltut,ng pie.. ~. Ell b united between
.ddsd = ~ - si1taa!k e 81 re-: a. - sease &
betwetn ne eoln@ns Inn hnmed!s1sly below low
pls1es. reaching from one column 70 oaother.
These piatea will be strongly bo1ted ard b11ced.
and the Space thus enclosed 1ued with either
concrete or in0se rock to prevent the lodgmcnt Of
either DRIFT rood or ice, and giving additional
strength 10 the structure Were the columns
sna Ss sns 70
there would be danger from the high wind1 prev.
h1eDt and the noatin8 maases which come down
Columns thsf a1o Mfeady do1a. This d % 81
etrapEe. Tho conpany expended oveE s5o,ooa u
Eoundlnes to ascertain INC depth End character Of
nsiteFtnE ftsalt9 E1ect pFonles oi ID foaads-
ticp have been qptaiped nom the soundlacs, md
lie 6olututs already doxn snow TINT tne sound
ings were aecuratsL Int cstn1N sppsoaohss
sse Il @ q 1ss s IT :, g res ~ lne
decusitJ beng z shoIn Of ssnd aud 1nelJ
grained toa. Ins touoEtas IN snsxsr g
by sinking tho tQbca: Tho DIST section, having no
bottom for oolting 70 it, counterpart, Is loHered
70 ~ nsss ~ nuse derrick, snd ,,s A. fgus q
hnaNed b double slf-pnmp. mored by steam
engine, and. u the Gaze Of tna nrst psar nesr the
shore, estobl!shed about 70 feet ffom the stte
Of the p,er: I1e xe,eht Of tho external otuos.
pbere, let fall upon tho cap, forces the cTlloder
downwards deptn depending upon ettheI M
coul aetnesa ot the loosepcsa of tha aall Wheo
level of the water Surface. the metal
cap y removed and another section boltcd
ou, tas eol.s passing is tasouaa tas cor; =;
tne,r raea " tho force Of gravity ia sae weight Of
the metal, aud In the pIeakure OF tho Asnosphere
oomes too hrtn for this mode q. operating. This
being tho ea6e, IN atr chamber made oS strong
toiler Iron, IN atze TO match the circumference ol
and Hotkmen zIe sent inside Of the column ID
c1caYate The nard eazth, while .tho woteF IL
nl 1sRt 91s 2 S.r ~ se Ct I
VI %hen II ah seah sna ssna - loossnsa
they ss 1osssd 9ns q y " ass Of tss hs eo!umn
HorE M @ for 81: Eo6mer - sonirassef. %so Guilds
wmpss.sed s1I IL sud bringing i ID escs Mi;h the
loofeued earth. the velocity md fofc4 Of tha cur
nt seno nc ;, in,oosa ne1s .q y RE
Er, making 1t . Curtoue 1ounMih of BsEd. ca8ting 1
!ts asneoNless spray ior serktal tods shout tae
sir e,eiops aad CO eons f % eaad
ee1le an lnte1esung scteu1nc fbet The coNprezs-1 |
ed A11 passes 10 the LII chamber nlfohYh cast
eeipet! rum the co1nruon atrnospnete IN Its CON-
mon ntneFpher1e Temperature. but ~ ha;FtpceaH
Of eonpress.os WITH nc piston ,s1d; y ysi-:s Y
evolves eEeueh of hest 10 render " dlh1eu1S to
place the nafed hand upon the pipe tffpagh which
It pnsses III acoE7TcTsed btate. The enleleDc9 Of
aes aas "a ssen eaas ysas g of sans
earth have been removed N thirty-t~o nssutca
Where hesyy ss,s Sl sIas ~ ,o1s ssaehsd e. Wo5
carried up through the coiumu 70 the cap, which
il TIE bottom os the atr chamber, BY w.tsdlaRs
and buete<, tho win1lass being wu1ted by don:
the alr-cA2mber. :. It ID then discharged through
the dcprps ssed hollow zzEas Al the .HdeA closed
s. suar III tor IS nearest pier . tae coaaen Mcas
Eide. Af,cr this wa Completed the water rose te.
some e1sent, md the oarEes perrar:d last winter
columns teIsg tcmoved to the borRes
An attenpc'was nsda u tow them to the pisces I
lot The iscatlon Of sbs second and !
81 1xt-I ,,fnx HVfT fL,ff hath
reached the reaycctise points the wntcs teceded,
md le11 them hRh eoa dr1. wfssan . few yards o1
faes Tste .esn dsssn ffo%
order, 70 as to continue rhsEoEK from them, hnt
In the meantime tha beachad barces were gotten
ts Sa 9na = tss POINTS s .as! 9ua oe
NTH ~ little delay ns pSssihie. Tho atst p4es |
ras sunk ecscnt5, feet 10 ruck Ins1de Of |
b. fraul.c cement Eh!s VII MAKE SOLID colIAA I
ol stope md unc RISING on the roct and Shielded
sr Esq OF Chicago to The can.raetof for building
this 1mmehse structure, and IS now in the city.
liz intends pushing forward tho ~ort with errrs'-
Ths rian Of the bridge wns prrparrd BY General
@. " Dodge, Chief Engtnecr ot TIC union Pacific
nas AZ assistant cp3!neer 10 the construction OF
:he Harlem b1idgc- Il lAe EuF1aeer aud HnPes1a-
aaSss sa.as a Walsos aa iors.1 as.sss4as Is
gtncer On tha Quincy or4dGn- has b "a chnrEe Of
running ths lines. mating taS ~ Ioannxs and do
In the piera theru Will b used about {, soo, go
pounds ot cast tou, md 70 COO pounds OF wrought
[1on In the AupeEstluctutc t.esc v Vi be 5,o31v Nv
pounds Of iron, mostly wsouCaL II viii require |
tnub 10 cnhlc a1ds 0t cath excavstton. ST, 900
lcet Ui tlIntel, boa1i measure, Ii the treatic ln
the east aud The es: dykea and approaches, and |
7Vee cr.nc yards Of ZIP 1aY IN ihe dykes, and \
atoo cubic yatds Of nasourJ In the west atai-
ment, bellur4 the nlnDant VI timber md iron
IN tie sa.te wp5k, platform. &c. Fh1eh cannot
Lc easily cAlc.ntcI These f1cA will give some
tie struclure. The entire length Of ttou wosk
1roper In sou feet the ttfstls will De noout the
same length, and " Ah the Garth elnoaukDcnt ap-
r1c1ch, WLl Ge Intee mIles long. Tha weight OF
the euperttfucurc will be ao0a 10 ands per llneal
lppl rut eacn column hnA supporting strength.
kfter uahg tha factor Of sAo loaA and eacn ptcra
curutaa oI sustaining ,61 toua, aho H1nE tnAt nf
ter The factor Of kalGtJ IL Applied 1t viii stlstan
w'tn perteet saiet. neMly tour times the weight
that wuLeVer he placed upon It; md the amouut
OF weight required u hEcas one column
1<0 tack high, without iaterN snrPort
Or, In other NpftlAY It's crushing weight VII oe
l:,ts. topa- Each column, tae.ttose, hAa twenkJ
timts the supporting strength TO carry any load
that cun bc put on INC bridge, and each pier forty
times tho strrn4Ih 10 carry any running loAd4
IEueea with similar foundations have been bunt
III this couuty-At Harlem, ~ y. J. AcAIplnc,
Etq., of A1stashusetts. \. ssyaanAe. nnl over
iope, Ct Win such deep founda.}ons Is thi1
prugo over the MIsAouTi vii BE-
In Europe great many bridges hAse been huus
on tu1t11Y p1crs and eAns0nt sunk W lAi4 proceAA
t1uouS them the C1}dc hndgc, n Scotland, whoee
columns wcro t1hE elghly.soseA feet he.oK low
water. The Saltash columns WcTs sunk 1lneEy
ttct, and tho hrdts1 s<at Ma Cno huadsed tccf
ahosc tor water. Tht Chcpstouo, orcf the MJe,
+, r<,ny1n. NJ ,tfn la 1rrt fOir Ny fECk dim.