An Improvement or Improvements in Coating Sheets or Plates of Iron and Steel with Lead.
Year: 1892

page_text: Date of Application, 25th Jan., 1892
Complete Specification Left, 5th Oct.. 1892-Accepted, 5th Nov., 1892
PROVISIONAL SPECIFICATION.
An Improvement or Improvements in Coating Sheets or Plates of
Iron and Steel with Lead.
I RICHARD BEAUMONT THOMAS, of R. Thomas and Co. Limited, of Lydney,
in the County of Gloucester Iron and Tin Plate Manufacturers. do hereby declare
the nature of this invention to be as follows:-
:-
The
Lead is an excellent and cheap preservative of sheet iron or steel but the
difficulties hitherto experienced in coating sheets or plates of iron or steel with
lead have prevented the general use of lead as a preservative of sheet iron.
fluxes which are successfully used in coating iron and steel with tin and zinc, such
as chloride of zinc, chloride of ammonium and palm oil are imperfectly operative
when lead is used.
The object of my invention is to effect the coating of sheets or plates of iron and
steel with lead rapidly and effectually so as to produce lead coated sheets or plates
of iron or steel which will compete successfully with galvanized sheets or plates of
iron, that is, sheets or plates of iron coated with zinc or other metal, such for
example as copper.
Sheets or plates of iron can be readily coated with an alloy of tin and lead (which.
alloy is well known as terne metal) and iron sheets or plates. coated with terne
metal are well known in commerce.
.
In coating sheets or plates of iron and steel according to my invention I first
coat the said sheets or plates with a thin coating of terne metal in the manner well
known and commonly practised. The sheets or plates so conted with terne metal
readily take a coating of lead when plunged in a bath of melted lead either with
or without a flux of chloride of ammonium, palm oil or with such other fluxes as
are used in coating iron plates with tin or zinc. In carrying my invention into
effect I prefer to pass the iron or steel plate under operation directly from the
bath of melted terne metal to the bath of melted lead, but I do not limit myself
thereto as the plates may be coated with terne metal and kept in stock to be
subsequently coated with lead.
Although the alloy of tin and lead commonly employed in the manufacture of
terne plates answers well in carrying my invention into effect I prefer to employ
a terne metal in which the proportion of the tin to the lead is less than in ordinary
terne metal as an alloy less rich in tin answers the purpose and is cheaper than an
alloy containing the ordinary proportions of tin and lead.
The appliances I use in carrying my invention into effect are such as are
employed in the manufacture of tin and terne plates and the manipulations similar
to those with which workmen engaged in the manufacture of tin and terne plates
are familiar.
Dated this 25th day of January 1892.
:
W. T. WHITEMAN,
Agent for the Applicant.
COMPLETE SPECIFICATION.
An Improvement or Improvements in Coating Sheets or Plates of
Iron and Steel with Lead.
I, RICHARD BEAUMONT THOMAS of Richard Thomas and Co. Limited, of
Lydney, in the County of Gloucester, Iron and Tin Plate Manufacturers, do hereby
declare the nature of my invention and in what manner the same is to be
Price 8d1

page_text: performed to be particularly described and ascertained in and by the following
statement :-
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Lead is an excellent and cheap, preservative of sheet iron or steel but the.
difficulties hitherto experienced in coating sheets or plates of iron or steel with
lead have prevented the general use of lead as a preservative of sheet iron and
steel. The fluxes which are successfully used in coating, iron and steel with tin
and zinc, such as chloride
imperfectly in coating iron
witli lead.
The object of my invention is to effect the coating of sheets or plates of iron, and
steel with lead rapidly and effectually so as, to produce lead coated sheets or plates.
of iron and steel which may be successfully, employed for the purposes for which
galvanized sheets or plates of iron are commonly employed and for other purposes;
that is, sheets or plates of iron coated with zinc or other metal bel
Sheets or plates of iron can be readily coated with an falloy of 'tin and lead
(which alloy is well known as terne metal) and iron sheets or plates coated with
terne metal are well known in commerce as terne plates.
andc,, chloride of ammonium and palm oil, operate
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In coating sheets or plates of iron and steel with lead according to my invention
I first coat the said sheets or plates with a thin coating of terne metal in the manner
well known, and commonly practised: The coating of terne metal is made thin by
passing the plate or sheet as it emerges from the bath of terne metal between
a pair of cylindrical rolls. by the regulation of the pressure of which rolls "the"
thickness of the coating of terne metal can be determined. The sheets or plates so
coated with terne metal readily take a coating of lead when plunged in a bath of
melted lead either, with or without a flux of chloride of ammonium or chloride-of
zinc.or palm oil; or with such other fluxes as are used in coating iron plates with
tin or zinc. In carrying my invention into effect. I prefer to pass the iron or steel"
plate under operation directly from the bath of melted terne metal to the bath of
melted lead, but I do not limit myself thereto as the plates may be coated with
terue metal and kept in stock to be subsequently coated with lead! The sheet
or plate may be transferred from the bath of terne metal to the bath of lead
either by hand or by means..of the well known transferring rolls commonly used.
for like purposes.
Although the alloy of tin and lead 'commonly employed in the manufacture of
terne plates answers well.in.icarrying my invention into effect I prefer to employ
asterne metal in which the proportion of the tin to the lead is less than in ordinary
terne metal as an alloy less rich in tin answers the purpose and is cheaper than an
alloy,containing the ordinary proportions of tin! and lead. Ordinary terne metal
consists of equal weightsi of tin and lead. I find in practice that an alloy containing
one part by weight of tin to three or four parts by weight of lead answers as well
or nearly as well as terne metal of the usual composition.
The appliances I use in carrying my invention into effect are such as are
employed in the manufacture of tin and terne plates and the manipulations are similar
to those with, which workŵmen engaged in the manufacture of tin and terne plates"
are, familiar. i
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Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed I, declare that I claim
as my invention of "An improvement or improvements in coating sheets or plates
of iron and steel with lead:-
Effecting the coating of sheets or plates of iron and steel with lead by first
applying to the sheets or plates of iron and steel a coating (preferably thin) of
terne metal and afterwards coating the 'terne coated plates of iron and steel with
a coating of lead substantially in the manner hereinbefore described!
Dated the Third day of October 189232
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RICHARD BEAUMONT THOMAS:
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