Improvements in the Process for Preserving Iron and Steel Structures from Oxidation.
Year: 1886

page_text: Date of Application, 10th June, 1886.
Complete Left, 8th Mar., 1887.
Complete Accepted, 7th Apr., 1887.
Improvements in the Process for Preserving Iron and Steel
Structures from Oxidation.
WILLIAM BRIGGS 3 Springfield Terrace Arbroath Manufacturing Chemist do hereby
declare the nature of this invention to be as follows:-
After cleaning the surface to be preserved I apply to it a coat of Varnish composed
of about 11 lbs. of Coal Tar Pitch-4 lbs. Tar Oil and 84 lbs. Coal Tar Naphtha mixed
together and before this Varnish is quite dry I cover it with a coat of British
Asphalte (or Coal Tar Pitch) to the required thickness-the usual thickness being
from one sixteenth to a quarter of an inch-I put on the British Asphalte (or Coal
Tar Pitch) with a brush-and whilst in a heated state-because then it at once
adheres firmly to the iron or steel surface prepared for it as above set forth-and
cannot be removed by any ordinary vibration.
Dated this Seventh day of June 1886.

page_text: Structures from Oxidation.
I, WILLIAM BRIGGS of No. 3 Springfield Terrace, Arbroath, Manufacturing Chemist,
do hereby declare the nature of this invention and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:
In carrying out my invention I prepare a varnish composed of about eleven pounds
of Coal tar Pitch, four pounds of Tar Oil, and eight and a half pounds of Coal tar
Naphtha, intimately mixed and incorporated in the manner usually followed in making
varnishes.
The surface of the iron or steel structure to be treated for the preservation of same
from oxidation, having first been cleaned, and all loose particles removed there-
from, is carefully coated over with the varnish prepared by the intimate admixture
and incorporation of the several ingredients hereinbefore specified, and in, or about
the proportionate parts thereof which I have given above. Before the varnished
surface is dry, and whilst in a sticky, viscous or tenacious condition, I cover it to the
requisite thickness by means of a brush, with one or more coats of British Asphalte
(or Coal Tar Pitch). The usual thickness of the protective coating, when finished,
will be from 1 to 4 of an inch, although in special cases a coating of greater thickness
may be adopted.
The British Asphalte (or Coal Tar Pitch) is applied whilst in a hot liquid state, to
the structure, because in this condition it at once adheres very tenaciously to the iron
or steel surface previously prepared for the application of the varnish in the manner
above described, and cannot be disturbed or removed by ordinary vibration,
contraction, or expansion.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed, I declare that what I claim is :-
Firstly For the preservation of iron and steel structures from oxidation the
preparation of such structures for the reception of the British Asphalte (or Coal Tar
Pitch) referred to in the following claim by coating same with a varnish substantially
as herein described.
Secondly The mode or method of applying British Asphalte (or Coal Tar Pitch)
to iron or steel structures whilst the varnish referred to in the preceding claim is in
a sticky, viscous or tenacious condition substantially as herein described and set
forth.
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321
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JAMES STEVENSON,
Gray's Inn Chambers,
20, High Holborn, London, W.C.,
Agent for Applicant.