The Washington herald., 1909-07-04

wood around the outer surface produces
practically a waterproof coating when
allowed 70 vulcanize before being used.
This process is especially applicable TO
ties. sllls poles. and other timbers com
ing in contact with the earth.
The difference between the Anardyce
process and that used in Germany con-
sists Of an injection OF zinc solution fol-
lowed by an injection Of dead oil; while
IN Germany the two preservatives are
mixed or attempted 10 be mixed with a
lighter gra6e OF oil, having less preserva-
tive qualities than that used in the Al
lardyce process. While the quantity of oil
is 30 per cent less than that used in the
Allardyce process, the zinc and oil while
agitated will mix but will not amalga-
mate and precipitates when agitation
cases, producing the following effect:
The of IN the cylinder precipitating 70
the bottom except a small amount ~
the lighter portions having a slight mix
ture in the center. leaving the upper stra-
IA comparatively free OF oil In other
words. the lower strata will be creOsOted;
the middle strata zinc and oil OF an in
feriOr grade. and the upper strata chic
ride Of zinc Burnertized.
Use of Zinc. Glue. and TaRnin.
This process was introduced IN St.
Louis in 1873 The first road 10 adopt
the use Of ties treated by this process
was the Atchison. Topeka and Santa Fe.
which was in 1885. Since its introduction
it has received considerable attention
from other roads and ties so treated are
now in use by the Chicago and Rock Is
land. Atchison. Topeka and Santa Fe
and the Mexican Central Railway Com
pany
The process consists Of an injection Of
? per cent solution OF chloride of zinc con-
tanning a small amount of glue followed
by a solution Of tannin- The effect OF
the tannin. II is claimed. being 70 form
with the glue an artificial leather. insolu-
BILE in water. which win close UP the ducts
and retain the zinc chloride.
There are two methods Of using this
process. First. by using the zinc. glue and
tannin as before stated; second, by max
ing three separate solutions and injections
Of zinc glue and tannin respectively.
This process is and has been used ex-
tensively for ties. but from all the In
formation available no very reliable rec
ord has been kept OF the durability Of the
ties so treated. The Gulf, Colorado and
Santa Fe Railroad Company has aban-
doned the use Of this process az its som
erville plant
Value of Treated Wood.
In $50 the Gulf. Colorado and Santa Fe
Railroad built out Of Galveston across
West bay a trestle L. 900 feet long. A con-
tract was made 10 treat the piling for this
structure. Page & Co. Of New Or
leans. contracted to furnish the oil used
This contract called for eight pounds OF
oil to the cubic foot Of timber. which
amount was totally inadequate as a pre-
yentiye against the ravages Of the teredO.
About $50 piles were treated with % 10
q pounds OF dead oil 10 the cubic foot
20 demonstrate its value when properly
used. This piling was placed in the
structure with those treated with eight
pounds Of oil The elght-pound treat
ment proved inadequate and did not pro-
long the life OF the piling to exceed four
years. whereas. those subjected 10 an
impregnation Of % 10 "A pounds Of OIL
are comparatively intact after a service
Of twenty-eight years.
The Gluf. Colorado and Santa Fe Rail
road rebuilt the bridge in 1894. About
4.0J0 sticks. also all stringers used were
treated. After ten years the piles show
no sign Of action by the teredo-