The Ottawa free trader. [volume] (Ottawa, Ill.) 1843-1916, 1853-09-10
The Illino, Central Railroad Bridge.

The Chicago Democratic Press Of the S,h
inst, gives large account Of the great Bridge
which the Illinois Central Railroad Company are
now constructing across tbs Illinois Rper ut
La Sale. The Bridge VIII be about 1900 feet
, long, and 10 feet above low water mark, with
draw 100 feet ia length The supursrruc,ure
Is to be 20 feet high, rooted over the railroad
to run On tie roof and wagon track below
Tie COS, o! the whole work viii he over $3.50,
COO
All the timber used on the bridge is to he
Bara,tisci, process which the Press thus de-
scrlbes:
The process has its name from It's inventor,
Sir William Burnett an f. glishmhn, who. in
proving up-n the old process OF hEUti-iHg has
pres .a.ed the world with an admirable preser-
vatye .gtns, the decay of wood used in .,ruc.
lures OF sufficient value to justify the moderate
additional expense By stating what Che COM
pany are about to 90, we thu, describe the pro.
cess To B. T. Johnson, Esq, yoang gentle.
man Of fine scientific IS well a. literary acquire
nenls, Col Mason has given charge Of the Gusl.
ness, and he ID nov absent in Massachusetts CON
tracing FOR the necessary machinery aud maturl.
ais, to be brought 10 Chicago, and put in opera
ton near the works Of Stone Boomer d Co
First Is required a cast iron cylinder, sixty feet
long and five feet Internal diameter, vi,cu IL
cast IN sections OF five feet each weighir-, about
500 pounds, with hAugcs to fit aud hold them
closely together, when properly packed and riy
oteI so a, to bemlde air and water t.ht. -
many stick, Of timber a. the cylinder will con.
tain, about 1000 fuet.l are introduced upon a
carriugs way, double door is closed upon II aud
bol,cd and packed air and water tight. An air
pump Is then put in motion to exrac! the air IRON
tho cylinder and the pores Of the wood, which
squirrs from two to three hours according To tue
peffectnesS the work and tie nature Of the
wood. This process tests severely The strength
OF 'he cfi!ndsr, inducing pressure O! about one
hundred and f.Ity pounds 10 the square inch.
The exhaustion o. the air being completed. a
liquid being chloride Of zinc in solution, Is in
jrctet until the cylinder is full after which
force pump, driven by steam power IS applied,
producing 3 pressure which fills the wood to ia.
centre withshe fluid. The liquid is drawn Of.
and tie wood is carried out into the open ar
,BarnGi.>E The process requires four hour..
Timber prepared 10 tbs way withstand, the
action OF fire better than common wool aud will
remain unaffected by the ordinary causes Of lie
cay, years after structures built Of timber IN it,
natural state have flllse into ruins. The with
draw1l Of the air and SAD, and the EXCLUSION Of
air aud water ever after by hlHng the pores Of
the wood and preserving il. hhres with this pre.
para;ion Of metal renders il had and impeae
trable, adding to ts strength and lesseRiny the
ultimate cost Of al wos Is in which it ,u.-i.
The expense Of It's preparation is not great
The machinery viii cost from ten to twelve thou
sand dollars Topreplfe 500 00O feet Of timhsr
viii require abou; $4,000 pound. Of the SOLUTION
at cost on the spot Of five cent, per pound -
The cost Of materials, labor, D.. necessary TO the
process, may be put down At $3.50 per 'hol.sq!
feet or entire, 80 10 The safety and d.rsblt.
Of the work will compensate ten y.I ..r this ad-
dhi0H to the original co..