IMPROVEMENTS IN TREATING TIMBER WITH ANTISEPTIC OR PRESERVATIVE FLUIDS
Year: 1883

page_text: LETTERS PATENT to Samuel Bagster Boulton of No 64 Cannon Street in the
City of London for an Invention of IMPROVEMENTS IN TREATING TIMBER
WITH ANTISEPTIC OR PRESERVATIVE FLUIDS
PROVISIONAL SPECIFICATION left by the said Samuel Bagster Boulton at
the Office of the Commissioners of Patents on the 12th December 1883.
SAMUEL BAGSTER BOULTON of N° 64 Cannon Street in the City of London
"IMPROVEMENTS IN TREATING TIMBER WITH ANTISEPTIC OR PRESERVATIVE FLUIDS
"
In the Specification to my Patent N° 02 of 1882 I described the treatment of
timber for the preservation thereof, either firstly, by impregnation with an aqueous
solution of tar acids extracted from the heavy oils of tar; or secondly, by first
impregnating with an aqueous solution of tar acids, and then subjecting the timber
to the processes described in the specification of my Patent No 1954 of 15th May.
1879., so as to expel the watery particles and impregnate the timber with an oily
body; or thirdly, by impregnating with an oily solution of tar acids; or fourthly,
by impregnating with naphthaline with or without the admixture of tar acid; or
fifthly, by impregnating with the distillates of the heavy oils of tar obtained at
temperatures above 500 Fahr., mixed with other oils; or sixthly, by impregnating
with a solution of tar acids mixed with metallic salts.
According to my present invention, I apply the processes described in the
Specification to my Patent No 1954 of 1879 to timber which has been previously
treated with one or other of the substances above enumerated, and included under
the third, fourth, fifth and sixth heads of my Patent N° 62 of 1882, that is to say,
after the timber has been impregnated with either an oily solution of tar acids or
with naphthaline, accompanied or not by tar acids, or with the distillates of heavy
oils of tar obtained at temperatures above 500° Fahr., or with solutions of metallic
salts with or without admixture of tar acids, it is subjected to the action of heated
creosote or other oily or bituminous body in closed vessels, so as to drive off the
watery particles from the wood, and further impregnate the same with such oily or
bituminous body. In treating timber in this manner with the substances referred
to under the fifth head of the said Patent of 1882, I should prefer to employ for

page_text: this purpose more particularly either the substance now known as acridine and
other isomeric substances, or other basic substances of the Quinoline or Leucoline
series or other basic substances of the heavier tar acids such as may be obtained
from the distillates coming over at high temperatures and which are valuable
antiseptics. Some of the above substances I have occasionally found to be
contained in distillates obtained at a temperature below 500° Fahr. In using
solutions of metallic salts for the treatment of timber according to the above
described invention, the subsequent treatment with a heated oily body, which may
or may not in itself contain germicide substances, will first cause the watery
particles of the said solution together with the watery particles originally contained
in the Timber to be expelled therefrom, leaving the metallic salt in the pores of
the wood, and secondly, the oily or bituminous substance in taking the place of
such watery particles, will prevent the metallic salts from being afterwards
dissolved out of the timber by the incursion of moisture from the soil or atmosphere
and will also impede the entrance into the wood of any further destructive agents.
I am aware that it has been proposed to inject timber firstly with metallic salts
in a state of watery solution and afterwards with an oily or bituminous fluid, as
described in Bethel's Provisional Specification N° 508 of 1853, but, according to
my improved process, instead of subjecting the timber after impregnation with a
salt to a heating process in a drying house, to expel the moisture, which drying
and heating process I consider to be detrimental to the timber, I expel such
moisture by directly subjecting the impregnated timber to the action of the heated
oil or bituminous body according to the processes described in my Specification
N° 1954 of 1879.

page_text: "
"
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Samuel Bagster Boulton in the Patent Office on the 10th June 1884.
SAMUEL BAGSTER BOULTON of N° 64 Cannon Street in the City of London
IMPROVEMENTS IN TREATING TIMBER WITH ANTISEPTIC OR PRESERVATIVE FLUIDS
In the Specification to my Patent N° 62 of 1882 I described the treatment of
timber for the preservation thereof, either firstly, by impregnation with an aqueous
solution of tar acids extracted from the heavy oils of tar; or, secondly, by first
impregnating with an aqueous solution of tar acids, and then subjecting the timber
to the processes described in the Specification of my Patent N° 1954 of 15th May
1879 so
as to expel the watery particles and impregnate the timber with an
oily body; or, thirdly, by impregnating with an oily solution of tar acids; or,
fourthly, by impregnating with naphthaline with or without the admixture of tar
acid; or, fifthly, by impregnating with the distillates of the heavy oils of tar
obtained at temperatures above 500° Fahr., mixed with other oils; or sixthly, by
impregnating with a solution of tar acids mixed with metallic salts.
According to my present invention, I apply the processes described in the
Specification to my Patent N° 1954 of 1879 to timber which has been previously
treated with one or other of the substances above enumerated, and included under
the third, fourth, fifth and sixth heads of my Patent N° 62 of 1882, that is to say,
after the timber has been impregnated with either an oily solution of tar acids, or
with naphthaline accompanied or not by tar acids, or with the distillates of heavy
oils of tar obtained at temperatures above 500° Fahr., or with solutions of metallic
salts with or without admixture of tar-acids, it is subjected to the action of heated
creosote or other oily or bituminous body in closed vessels, so as to drive off the
watery particles from the wood, and further impregnate the same with such oily or
bituminous body. In treating timber in this manner with the substances referred
to under the fifth head of the said Patent of 1882, I should prefer to employ for
this purpose more particularly either the substance now known as acridine and
other similar or isomeric substances or other basic substances of the Quinoline or
Leucoline series, or other basic substances, or the heavier tar acids, such as may be
obtained from the distillates coming over at high temperatures and which are
valuable antiseptics. Amongst the tar acids I prefer those which are less volatile
and less soluble in water than carbolic acid and cresylic acid. Some of the above
substances I have occasionally found to be contained in distillates obtained at a
temperature below 500° Fahr.. In using solutions of metallic salts for the
treatment of timber according to the above described invention, the subsequent
treatment with a heated oily or bituminous body, which may or may not in itself
contain germicide substances, will first cause the watery particles of the said
solution together with the watery particles originally contained in the timber to
be expelled therefrom, leaving the metallic salt in the pores of the wood, and
secondly, the oily or bituminous substance in taking the place of such watery
particles, will prevent the metallic salts from being afterwards dissolved out of the
timber by the incursion of moisture from the soil or atmosphere and will also
impede the entrance into the wood of any further destructive agents.
I am aware that it has been proposed to inject timber firstly with metallic salts
in a state of watery solution and afterwards with an oily or bituminous fluid, as
described in Bethel's Provisional Specification N° 508 of 1853, but according to my
improved process, instead of subjecting the timber, after impregnation with a salt,
to a heating process in a drying house to expel the moisture, which drying and
heating process I consider to be detrimental to the timber, I expel such moisture

page_text: by directly subjecting the impregnated timber to the action of the beated oil or
bituminous body, according to the processes described in my Specification N° 1954
of 1879.
In all cases my experience leads me to set the highest value for wood preserving
upon such Antiseptics as are in themselves least volatile, and least soluble in water,
with a due admixture of bodies which solidify within the pores of the timber.
Tannin and other astringent bodies derived from vegetable substances may
sometimes be used with good effect.
Having thus described the nature of my invention and in what manner the samo
is to be performed, I claim:-
First. The process of treating wood with antiseptic or preservative substances,
wherein the timber is first treated with any one or more of the substances or
combination of substances referred to under the third, fourth, fifth and sixth heads
of the Specification to my Patent N° 62 of 1882, and is then subjected to the
action of a heated oily or bituminous body according to the processes described in
the Specification to my Patent N° 1954 of 1879.
Second. The process of treating wood with antiseptic or preservative substances,
wherein the timber is first treated with a solution or solutions of metallic salts and
is then subjected to the processes described in the Specification to my Patent
No 1954 of 1879.
Third. The process of treating wood with antiseptic or preservative substances
wherein the timber is first treated with the basic substances called acridine and
other basic substances or alkaloids of the leucoline or quinoline series, or with the
heavier less volatile and less soluble tar acids, when separated from coal tar, the
timber being afterwards subjected to the processes described in the Specification to
my Patent No 1954 of 1879.
In Witness whereof I the said Samuel Bagster Boulton 'have hereunto set my
hand and seal this Sixth day of June in the year of our Lord One thousand eight
hundred and eighty four.