AN IMPROVED COMPOUND OR MIXTURE FOR COATING THE SURFACE OF IRON TO PREVENT THE FORMATION of Rust
Year: 1881

page_text: LETTERS PATENT to Charles James Davidson, Foreman in the employment
of Messieurs Richard Perry, Son, and Company, of Temple Street Works,
Wolverhampton, in the County of Stafford, Japanners and Tin Plate Workers,
for an Invention of "AN IMPROVED COMPOUND OR MIXTURE FOR COATING
THE SURFACE OF IRON TO PREVENT THE FORMATION of Rust.”
PROVISIONAL SPECIFICATION left by the said Charles James Davidson
at the Office of the Commissioners of Patents on the 29th September
1881.
CHARLES JAMES DAVIDSON, Foreman in the employment of Messieurs Richard
Perry, Son, and Company, of Temple Street Works, Wolverhampton, in the
County of Stafford, Japanners and Tin Plate Workers. "AN IMPROVED
COMPOUND OR MIXTURE FOR COATING THE SURFACE OF IRON TO PREVENT THE
FORMATION OF RUST."
For coating the surface of iron exposed to the action of the weather or otherwise
liable to be exposed to a moist atmosphere, the compound or mixture is formed
by first dissolving one and a half ounce of caoutchouc in three quarters of a pint
of hot turpentine, and afterwards adding
3 quarts raw linseed oil.
2 lbs. best white lead.
pint liquid terebine.
pint naptha.
4 ounces camphor..
1 ounce plumbago.
The compound or mixture is a liquid, and is laid on by means of a brush as in
painting, or, if convenient and desirable, the article to be coated may be dipped into
the liania The entition 8 the i

page_text: the exact proportions as stated not being essential for the purpose specially
mentioned as being that to which they are applicable.
The compound or mixture may be used on the surface of iron which is to be
afterwards japanned, painted or otherwise coated, in which case the proportions
of the ingredients may be varied as desired. When so used the surface of
the iron is preserved from rusting and causing the japan, paint, or other coating
to peel off.
The compound or mixture may be used also as an anticorrosive paint for
ironwork by adding any suitable coloring matter before laying on the compound
or mixture, but in this case the plumbago is not required.
The compound or mixture may be applied also to the coated surface of iron
coated with tin, or other metal, or alloy, to prevent oxidation taking place through
the pores or interstices of the coating metal or alloy,

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Charles James Davidson in the Great Seal Patent Office on
the 28th March 1882.
CHARLES JAMES DAVIDSON, Foreman in the employment of Messieurs Richard
Perry, Son, and Company, of Temple Street Works, Wolverhampton, in the
County of Stafford, Japanners and Tin Plate Workers. "AN IMPROVED
COMPOUND OR MIXTURE FOR COATING THE SURFACE OF IRON TO PREVENT THE
FORMATION OF RUST."
"
The compound or mixture which forms the subject of this Invention I term
'perryline," and shall refer to it by that name in the following description :-
The perryline as I usually employ it is prepared as follows:-A solution
consisting of 2 ounces of gutta-percha dissolved in 12 ounces of resin spirit is
boiled with 5 ounces of camphor in 2 quarts of linseed oil, and to the compound
or mixture thus obtained is added a solution consisting of 3 ounces of caoutchouc
dissolved in 1 lb. of turpentine, and there is added also 2 lbs. of plumbago or
2 lbs. of white lead, and also 3 pints of linseed oil, 1 lb. of copal varnish, and
ounces of liquid terebine.
The copal varnish assists in setting the porryline when laid on to the surface
to be coated with it. The naptha mentioned in the provisional specification is not
now employed, as it was formerly used to dissolve the camphor which is now
dissolved in the linseed oil. The 2 ounces of gutta-percha dissolved in resin spirit
may be omitted if desired, in which case 5 ounces instead of only 3 ounces of
caoutchouc should be dissolved in the 1 lb. of turpentine. In either case the
camphor dissolved in boiling linseed oil must be employed. Perryline which has
gutta-percha as an ingredient sets harder than when made without it, and also
acts to some extent in resisting the action of acids.
The caoutchouc is preferred to be dissolved in the turpentine cold, as being more
convenient and free from danger, but the process may be considerably quickened
by heating the turpentine. The same remark applies also to the dissolving of the
gutta-percha in the resin spirit.
The perryline is a liquid and is laid on to the article to be coated by means
of a brush as in painting, or if convenient and desirable the article to be coated
may be dipped into the liquid. The perryline should always be well shaken or
stirred whilst in use, as the heavier ingredients settle at the bottom.
The plumbago is usually employed as an ingredient in the perryline when tho
same is to be employed as a coating to stoves, fenders, and such like articles which
are intended to be afterwards blackleaded. The white lead is employed as an
ingredient in the perryline when the same is to be used as a paint either with or
without a mixture of color, and when the white lead is used the perryline dries
quicker than when the plumbago without white lead is employed as an
ingredient.
Both plumbago and white lead may be employed together in any desired
proportions as ingredients in the perryline when used as a paint to give a grey or
neutral tint.
Both the plumbago and white lead are dispensed with when the perryline is
to be used for coating bright iron or steel to preserve it from rusting when
not in use.
The perryline is used chiefly as a first coating or priming to be afterwards
coated with paint, varnish, japan, or with perryline, made up with color and used
as a paint, or with other suitable finishing coat, and when so used the surface of the
iron is preserved from rusting and from causing the paint, japan, varnish, etc., to
peel or chip off.

page_text: The perryline may be applied also to the coated surface of iron coated with tin
or other metal or alloy of metals to prevent oxidation taking place through tho
pores or interstices of the coating metal or alloy, and is specially suitable in the
case of tin-plates which are afterwards to be japanned or otherwise similarly
treated, as the japan, etc. is thus prevented from peeling or chipping off.
The perryline appears to have a cementitious quality, in addition to being an
anti-corrosive coating for iron, as japan or similar coating laid upon it does not
chip off so readily with rough usuage as when laid direct upon the metal
surface.
When perryline is used as a coating for iron on which rust has previously formed
it is preferred to employ stronger solutions of caoutchouc, gutta-percha, and
camphor, by using say 34 ounces of caoutchouc, 2 ounces of gutta-percha, and
6 ounces of camphor, instead of the 3, 2, and 5 ounces of such ingredients
respectively, as before stated, the other ingredients being kept as before. The
loose rust should be brushed off, and the perryline when laid on will form in
combination with the adhering rust a cement which will prevent further
oxidation taking place. In this case it is preferred to coat the iron twice with
perryline before painting.
The perryline dries without heat and does not readily crack or chip off the
surface on which it is laid; it resists moisture or atmospheric influence, and retains
its anticorrosive and adhesive qualities for a long time.
Having now stated the nature of my said Invention and particularly described
and ascertained the manner of performing the same, I declare that I do not limit
- myself_to_the_exact proportions of the ingredients given as composing the perryline,
as the same may of course be varied considerably without departing-from-the-
nature of my said Invention, nor do-l-confine-myself-to-all-tho-exact ingredients
named where there are equivalents which would be obvious to a person skilled
in the trade or trades to which the Invention relates, but what I claim as
my Invention and desire to secure by the herein-before in-part-recited Letters
Patent is,―
The improved compound or mixture for coating the surface of iron to prevent
the formation of rust, substantially as herein described, and referred to by the
name "perryline."
In witness whereof, I, the said Charles James Davidson, have hereunto
set my hand and seal, this Twenty fourth day of March, in the year of
our Lord One thousand eight hundred and eighty two.
CHARLES JAMES DAVIDSON. (L.S.)
Witness,
STEPHEN WATKINS,
Assoc. M. Inst. C.E.,
Office for Patents,
Wolverhampton.