COATING IRON, STEEL OR OTHER METAL WITH LEAD
Year: 1884

page_text: I JOHN MAKIN of Charlestown, Glossop in the County of Derby Paper Mill
Manager do hereby declare the nature of my invention for "AN IMPROVEMENT IN
" to be as follows :―
COATING IRON, STEEL OR OTHER METAL WITH LEAD
This invention relates to the coating of iron steel or other metals with lead and
is applicable to a variety of useful purposes such for instance as the coating with
lead of the vessels used for boiling wood fibre with acid solutions in the manu-
facture of paper; coating of the interior of cast iron pipes with lead so as to resist
the action of acids; and numerous other uses where it is desirable to apply a thick
coating of lead (by casting in a molten state) to one or both surfaces of iron steel
or other metal,
The object of the invention is to cause the lead to adhere closely to the iron or
other metal and to prevent it from becoming loosened, as frequently happens when
such lined vessels are exposed to heat in consequence of the unequal expansion and
contraction of the iron or steel and the lead.
The invention consists principally in perforating the iron or other metal all over
with a number of holes (say from one quarter of an inch to three inches asunder
more or less) and then to apply the coating of lead, in a molten state; by which
means the coating of lead is formed on both sides of the iron or metal and the two
are united together through the perforations at intervals all over the surface.
The consequence of this is that the lead adheres closely to the iron or other
metal, and if any unequal expansion takes place the effect is minimised and
localised and the lead coating cannot leave the surface of the iron or other metal,
being bound through from side to side by leaden studs or pins at each perforation.
If the surface of the iron or other metal is galvanized before the lead the lead is
cast on, the latter adheres still more closely.
In cases where it is only desired to coat one side of the iron or other metal with
lead I countersink the holes on the reverse side so that when the molten lead is
run on it flows through the perforations forming as it were leaden rivets to hold the
lead coating in its place.

page_text: COMPLETE SPECIFICATION.
I JOHN MAKIN of Charlestown Glossop in the County of Derby Paper Mill
Manager do hereby declare the nature of my invention for "AN IMPROVEMENT IN
COATING IRON STEEL OR OTHER METAL WITH LEAD" and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement :—
This invention relates to the coating of iron steel, or other metal with lead, and
is applicable to a variety of useful purposes such for instance as the coating or
lining, with lead of the iron or steel boilers or vessels used for boiling wood fibre
with acid solutions in the manufacture of paper pulp; coating of the interior
of cast iron pipes with lead so as to resist the action of acids; and numerous other
uses where it is desirable to apply a thick coating of lead (by casting in a molten
state) to one or both surfaces of iron, steel or other metal.
The object of the invention is to cause the lead coating or lining to adhere
closely to the iron or other metal, and to prevent it from becoming loosened as
frequently happens when such lead lined vessels are exposed to heat in consequence
of the unequal expansion and contraction of the iron or steel and the lead.
The invention consists principally in perforating the plate or sheet iron, steel, or
other metal article, all over with a number of holes (say from one quarter of an
inch to three inches asunder more or less) and then placing the same in a mould
suitably prepared and afterwards running in the load in a molten state; by which
means the coating of lead is formed on both sides of the plate or sheet of iron or
steel or other metal article to be coated, and the two coatings are united together
by the plugs of lead running through the perforations at intervals all over the
surface.
The consequence of this is, that the lead coating adheres closely to the iron, steel,
or other metal and if any unequal expansion takes place, the effect is minimised
and localised and the lead coating cannot leave the surface of the iron or other
metal, being bound through from side to side by leaden plug studs or pins passing
through each perforation, such plugs, studs, or pins being formed or cast in ono
piece with the coating or coatings as described.
If the surface of the iron, steel, or other metal is galvanized before the lead is
cast on, the latter adheres thereto still more closely.
In cases where it is only desired to cont one side of the iron or other metal with
lead I countersink or enlarge the holes on tho reverse side so that when the molten
lead is run on to form the lead coating it at the same time flows through and fills
the perforations forming as it were leaden rivets to hold the lead coating in its
place.
In this case instead of casting the molten lead into the perforated iron or other
metal a plain sheet of rolled lead may be placed below the perforated iron or other
metal, and the connecting plugs or rivets may be formed one by one by running
lead or solder (by means of a blow pipe) into the holes so as to fill them and
become fused with the back of the sheet lead coating and thus cause it to adhere
closely to the iron or other metal,

page_text: 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
First. The method of coating iron steel or other metal on both sides with lead
by perforating the former all over with holes and then placing the perforated metal
in a suitable mould and running in the lead in a molten state, so as to form a
coating on each side, the two coatings being joined together at intervals, by plugs
or pins passing through the perforations and forming one piece or casting with
both the coatings substantially as described.
Secondly. Coating iron, steel, or other metal with lead on one side only, by
perforating the former all over with holes countersunk or coned on the reverse
side and then casting or running in the lead substantially as described.
Thirdly, Coating iron or steel or other metal with lead by perforating the
former all over with holes, placing a sheet of rolled lead beneath the same and then
running lead or solder into the holes by means of a blow pipe so as to form plugs
or rivets fused to the rolled lead coating substantially as described.