Evening times-Republican. [volume] (Marshalltown, Iowa) 1890-1923, 1916-03-23

tiveS OF the federal O1Ilce Oh lOdQo dho
rural engineering Of the department OF
agriculture. ~
After having been on the road since
Monday morning those with the train
have found that the two coaches ar
ranged for lectures aT5 Quio.s!!y Allied up
even In the small towns, and 1t was
with this in mind that arrangements
have been made for place where
more can be accommodate here.
Send Out Letters.
Secretary johnson, of the Marshall
town Club, mailed this morning 1900
circular letters to farmers Of Marshall
county, explaining to them the plan OF
having the lectures at the Strand, and
asking that they make a special effort
to be present on time in order that the
lecture may start promptly and be
completed before the regular sho"
starts. These letters will reach the
farmers by Friday morning and It 10
expected a big crowd viii be on hand.
The models Of the roads VIII not De
removed from the cars.
80. Exhibit Car Interesting.
The exhibit car Is equipped with
twelve models showing different types
Of road building from Roman road
laid down in 300 B. c., to. the latest
type OF asphalt block road, and shows
also a model Of a reinforced concrete
bridge andsa model Of the special foun-
dations and drainage At the sides or
the cars are twenty large photographs
furnished by the Iowa state highway
commission. showing styles OF con-
struction of highways and bridges and
twenty views furnished by the govern
ment showing roads under process OF
construction and the resultant benefits
Of improvement. H. gEasss ~
Roman Read Exhibit.
The model Of the Roman road 10
shown for the interest which attaches
to a road which has lasted and - still
disable after 900 years. e.
The second exhibit 10 the model OF
an earth road. All Of the models arc
one-twelfth actual size. Tho earth
road model, showing the typical bad
road, and road crowned with the
grader and the road when dragged. to-
gether with small model Of q road
drag, is of especial importance be-
cause nine-tenths Of the 100000 miles
Of roads in the United States are earth
roads. Mr.. Tobin said hast night that
he knew Of no place where earth roads
are successful In wet climates. .'a,,-
The third model, the gravel road.
probably win attract large share OF
the attention OF the visitors to the
car in view Of the. fact that the boost
e-s have adopted the. slogan, TEavel
on Gravel for the trip and cards
bearing that motto VIII be conspicu-
ously placed thruout the train. The
model showb the prepared sub grade,
the first course which il. rolled and OF
four inches compacted. and the second
c6urse completed with two inches COM
pacted. s $sS =.
Other Kinds 81 Reads. ~
Other models show the simple ma
cadam road. the macadam road with
bituminous surface treatment. the re-
surfaced macadam road treated by the
penetration method the bitun1inons
macadam road built by the mixing
method, the sand clay road, the con-
crete road, the asphalt block road and
the brick road. Ss.s "a NJ gT5E
..rhe sand clay road Ii still under en-
Fermentation BY the goyernnsent ex-
perts and more than 1890 miles Of
such road fhave bean buitt and &re tn-
der observation - North and South
Carolina. & -
An innovation recently adopted for
trial by the govsrnmsnt msn IN the
building Of the conprets Tuad = the
placing Of the expansion Joints diax-
onally across the. road instsad sof ct
right angles with the stl1es Of the
road. The method has the advantage
Of allowing the whsSls of vallcles to
strike the point at dinefSnk stiSMes and
presents the heavy Jars to tte road and
the shock TO the vehicle itssK
VI The asphalt block road. one OF the
later inventions, 10 paved s sss<;:.:
of asphalt az with bricks.
Model conerats 1sidg2s
The reinforced concrets1 hffoos mpdef
is OF the ineascd I-beaIn type and.
shows the bridge half conplstsds antf
with the forms IN place u ~ other
half. 81 an assY, N sS
Mr.. Tobin and Mr.. Hooper WIN con-3
iine themselves In their lecturss entire
Nv to an explanation Of methods OF
road financing and a presentation Of
the henefits which accrue from road
innrovennents They will leave the
questions Of hsineerins and All local
problems to the other speakers OF the
party ana 70 the local speakers who
VIII ipin ION
sssss mile trip They VII Arecntnmend
no particular kind q roa but viii ex-