The Richmond Virginian. (Richmond, Va.) 1910-1920, 1914-11-08
ROAD MACHINERY
FOR 1000 YEARS
EVOLUTION OF road BUILDING TO
BE SEEN AT ROADS
CONGRESS-. .
IN ATLANTA ALL WEEK
OFFICE OF PUBLIC ROADS OF U. 8.
DEPARTMENT OF AGRICULTURE =.
HAS HISTORICAL AND TECH j.
NICAL EXHIBIT.
IN ATLANTA ALL WEEK

The ONCE of public roads of the
United States Department of Agrtcul-
ture will display at Atlanta, Ga. dur
ing the Fourth American Road Con-
Eress, which begins tomorrow. com
plete set of models illustrating the
construction and maintenance of stan
dard types Of roads. The models will
be so arranged as to present the his-
toricai and technical development OF
road building. 1t will be the most com
plete and Interesting exhibition ever
made by the government on this sub
feet.
An interesting feature OF the exhibit
will be set of models showing the
evolution of~Stone road building for
period of two thousand years. and
viii include the Appian Way. as repre-.
senting the Roman typo OF construe-
ton, the early French roads during the
reign of Napoleon l.. the Telford and
early rnacadam roads built in England
during the reign OF George w, and
macadam roads as they are constructed
today.
One of the models illustrates the
characteristic features of road con.
struction in the Swiss Alps; another
represents the best practice in this
country Of road location and reloca
ton. In the latter model In shown ar
old earth road, with characteristic Tea
lures, such a. steep grades, bad align
ment. dangerous grade crossing. un-
safe wooden bridges poor location
inadequate drainage. diiapidated farm
buildings, and the old district school.
house. with unsightly and unssnitary
surroundings In the same model II
shown the new road. located on high
ground on side hill slopes. with easy
grades. pleasing and practical align.
ment, with grade crossing eliminated
permanent cuivert and bridge. good
drainage, a wen constructed and main.
tanned macadam surface, slightly farn
buildings and attractive consolidated
district schoolhouse, supplied with purs
water by means Of windmill, and reser.
votr
illustrating Three Varieties.
The most approved methods Of sub
drainage. for roads which pass over
soft or unstable ground. are shown by
model which represents the v-draIn
the Tsiford base. and the French drain
Models showing details OF construc.
tion and important stages In the build.
Ing Of a reinforced concrete culver,
and a concrete bridge of the incaset
steel I-beam type are also included.
Three OF the modeis illustrate the
construction OF earth. sand-cIay and
gravel roads. Miniature mechanical
models In actual operation show the
auarrying and crushing of stone and
the use of a power roller working on q
mace dam road.
Since the coming Of the automobile
with the consequent aEgravAtion OF
the dust nuisance. numerous methods
have been devised to secure lasting
and dustless road surfaces. The mos!
important Of the types thus developed
aside from the paved roads adapted te
heavy traffic. such AZ asphalt block. are
generally CHASED ~ bituminous con-
struction- These types have been large.
ly developed during the past few years
and are represented In the exhibit b.
the following models: Surface treat.
ment Of new macAdam road: resurfacs
of old macAdam road by the penetra-
tion method: penetration method; mix.
ing method: mixed nllsr method: rock
asphalt. and Topeka specification.
All the models are built to the scale
Of one inch to the foot. or one-twslfth
Of the fun size.
An automatic predecessors viii pre-.