The Clarksburg telegram. [volume] (Clarksburg, W. Va.) 1874-1926, 1912-07-18

49, =. y.
about Is per cent. !. The careful enEi-
neer viii set his grade stakes not
more than City feet apart. and in ne
case should they be over hundred, and
these win serve later for the macadam
work. In grading ample material
should be left to form the shoulders.
Care should be used in properly slop-
ing cuts and dis TO avoid as far as pos
stple settlement Of material A slope Of
not less than one and one-half to one
should oe nsed. Care should also be
taken 10 nave the gutter grades SO liked
tnat Lhere VIII be at least fall cf SIX
incnes 10 each hundred Teet In order to
provide surface drainage.
IN general any stone that Is to be
used N road building should be test
60 Tor hardness, tougnness, resistance
10 wear ana blndlng or cementing val.
ue. Inc SPECIFIC gravity, weight per
cnDic loot and water absorbed nre also
determined. With such data us this In
hand nnd knowledge OF the volume
ana cInracter OF franc TO which the
roau - subjected tue engineer can
make an intelligent selection or the
pest avallaple material. Whlle the dia-
Dases' olorltes anu nasalts. ali com
monty known as 1faprocs. IN general
meet tne conditions where macadnm
Eoaas are necessary. yet It ID unwise to
seiect a>rock by species alone, as they
HI vary greatly.
There are two distinct types of bro
ken stone road In use today. known Us
macadam and telford roads. The mac
adam road Of today is so different from
the type specified by Macndam that the
lelatlon Is hardly recognizable. BY the
pest praeuees USED ans road consists In
a ioundation course OF two and one
mar men stone OF varying thickness.
Anis 'ounoanon shou!d be thoroughly
rolled Win u steam roller aud not more
IMAM thickness Of I've or SIX Inches
roiieu NJ time. ON top OF this Is
placea a three or four inch layer of one
ana ohe,hnlt inch stone, ana after thor
ousniy roiung layer offroek screen
ings paloW tnree-quarters OF an inchitn
SIZE ID spread. This layer of screenings
snouia De suthcient only to Ill the sur
race yoius OF the wearing course and
should not be applied nll In one layer.
Each application OF screenings should
pc rolleo In before the next application
IS MADE. After the surface has been
thoroughly niled with screenings the
ROAD should be well sprinkled with a
watering cart ana rolled with steam
roi!er until 1t Is thoroughly bonded.
Tbs rolling should continue until the
SURFACE ceases to wave In front OF the
roller
Stone should never be dumped on the
road, and ifIspeeialiy devised spread
ing wagons are not used the stone
should be dumped on boards.and spread
from them on to the road. The, con-
tractor should be required to place
about hundred tons of No. 2 stone
and screenings at a convenient place
Tor each mile Of road built for the pur.
pose or making future repairs.
The telford road of today varies only
from the macadam road In that It has
hand paved foundation course. CON
sisting Of coarse stone eight or nine
inches in It's greatest Dimensions.
These stonesGare placed on edge in the
subgrade by hand. on their broadest
bases and ut right nngles to the line of
the road. and, irregular portions are
broken on with hammers. a
This tyre of road was first designed
by French engineer named Trcsaguet
forty years in advance Of Telford. The
roads built by Telfordl had fiat sub
grades, but those constructed by Ire
snguet had carnbered 'subgrades. which