La Junta tribune., 1912-06-29


oees will ~ hla Hrade ssskes sos
more than nf,y feet .i..rt. aud In "a
csse should they II. ov-r nn,sir.c. and
there Will ss'rvp ia,es for the n,acs da III
work In Hrad.nx smpIe nat,-ftai
should " Iefi To form tb~ shoui.i..rs
Care soou'd i'~ 0~.-d iB pso,s-riy niots
ihx cvts shsi nIl~ 10 avoid ~ far ~ g-oa.
sible sett'en,esa VI msi-risi. A ..v,,p vs
not Iess Than ope aud vts~ haf t. Que
should " ussd. Care should nl.o h.
taken 10 have The Kutfrs grades ~ rxsi
fhst tb~fr will i,e NJ least fall u siA
inf.hss ~ ~. h l.u,ssir,-d fsst In vsu.er u
prvvsde ,urfs'e .irsii,ag~.
10 ssn<fnl. al! stone that is to b..
used 10 rosd i,uiiding .b.alI IN te.s
I'd for hsrdne... toaghs.-... r.--i.,s oc~
to ~sar and binding " ,e,u.niiux vsi.
~. The sp~cinc gravity. wright t.-r
eubsc foot sud wster sbsorisd ar.. i.n
detcrmined- VITA such DIST. a. This In
band and n kp0wlcd:e of The ,oume
and chs r.cses of trnfac 10 which the
rosd Ii subjected the engineer ,ap
oake an iateiiigrnf s..iesfiou VI the
best Available uinferisi While the dia
bases, diorite, apd bsssits. all CON.
0osiy known ~ trspsvck. In general
meet The cOnditiou. where nscsda y
rosds are nec~~-ary. ", 1t 10 upwtse to
se'sri . roct by SPECIES alone. ~ they
oil vary greatly.
There arr two distinct types Of bro
ken stoue road In n~~ today. known ~
Wacadam aud t~lford rosda The mac
adam rvad VI today In 81 dtfYereut from
ths type ss,e'.ib~d BY MscAdam ihat tie
relation Is hardly reruxnixst,'~. ny The
best practices used this rvsd consists In
. foundation cours.. OF Two and one
half inch stone of varying thickn~ss-
This foundation should Le thoroughly
rolled with y steam roller and nos mors
thnn . ihkkues~ Of nve or six inches
RULED st 3 time. On top " this II
placed tLre~ or four inch layer of one
sud on~ half inch stone. aud after thor.
ouKnly rolling . layer OF rock screen
Tugs beiow ihree-quar,er> u au inch in
size Is spread This layer of screenings
should fre sufficient only to oil the sur.
should mol be applied all In one layer
Each application OF SCREENING. should
lie rolled in before the next application
Is made After the surface has been
thoroughly tilcd with screenings the
road should be- well >prinllcd with =
watering cart aud rolled with n steam
roller until II l. thoroughly bonded
This rolling should continue until the
surface ceases to wave In front OF the
roller.
Stone should never lie dumped on the
road and n specially devised spread
should b. dumped on board. and spread
from them on TO th. road The con
trnctor should be required Ia place
about q hundred tons of No. . stone
aud screenings at n convenient place
for each mile of road builf for the pur
pose Of making future repairs
The telford road u today varies only
from tn. mscadam IN road In that IL has
y hand Isved foundation cour~e. con
sistius - coarse -t"n~ eight NJ min
inches In its Er~~te~t dimensions
These stone. are placed on edge In the
snbgrad- by hand on their brcsdest
l,ns.., and ~ right angles to the line Of
the road. and all Irregular portions are
broken on with hammers
This yr- ~ road Wits erst designed
ny n French engineer named Tre~a Euet
forty year, In advance of Telford The
r,ndS built by Tclford hnd nat sub
grades. hut those constructed by Ire
-, guet had camben.d subgnde-. which
sr~ Supposed to have the eject Of
keystone arch. and this II the form In
which they are constructed today II
ls rsther an interesting fact that In
France practically all Of the broken
.tous ruads nr~ of the Macudsm tyre.
while In England they are largely of
the Tr--agu~t ~ Tsiford tyre,
Experience In. proved that The only
way IN which roads can h. Kept IN
COOL condition and ai reasonable cOsa
Is by continuous and tni.liiKeu' main
s~nance u In . u,istakes although un
fortunately general impression thss
certain types u rUsd are permanent
No perma n-n' resd ha. ever bern Geo
stvurted " ever can tr.
Cutters. rnich hasis- and eulvses-
snghs ny sii WseaDs u b. kcN cSess'
s,ri small xuilie- 10 s6ouI6er~ seosi0
b. ailssi Lefos- they tecom~ ,vo large
n bos-e ssoee which p<esiy slwsys
spSrsrs ON The surface of = maesds~
sosd sbe arus srsiag after u y bsih
shoa,A ~ naked ur as1 stacked for n
ssrv ~ SAsli hsses sd torsesses
- -. - - - u.