IMPROVEMENTS IN THE MANUFACTURE of TIN AND TERNE PLATES, AND IN THE APPARATUS USED Ttherefor
Year: 1879

page_text: LETTERS PATENT to William Albert Johns, of Gilwern, in the County of Brecon,
Metal Refiner, for the Invention of "IMPROVEMENTS IN THE MANUFACTURE of
TIN AND TERNE PLATES, AND IN THE APPARATUS USED Ttherefor.”
Sealed the 7th November 1879, and dated the 14th May 1879.
PROVISIONAL SPECIFICATION left by the said William Albert Johns at the
Office of the Commissioners of Patents on the 14th May 1879.
WILLIAM ALBERT JOHNS, of Gilwern, in the County of Brecon, Metal Refiner.
"IMPROVEMENTS IN THE MANUFACTURE OF TIN AND TERNE PLATES, AND IN THE
APPARATUS USED THEREFOR."
This Invention has for its object improvements in the manufacture of tin and
terne plates, and in the apparatus used therefor, and relates more particularly to
dispensing with the machinery and manipulation hitherto requisite for cleaning
and coating sheets or plates of steel, iron, or other metal with tin or terne metal or
alloys.
In order to clean such plates ready for coating I pass them singly through
a conveniently formed chainber from end to end, and in the lower portion
of which chamber a suitable acid is contained, while that end of the chamber
where the plates are introduced extends upwards in an elongated curvilinear
form, and is provided with slotted guides through which the plates are passed
down successively into the acid bath, and pass out at the other end of the
chamber into a water bath. When cleaning without acids 1 place in the lower
portion of such chamber a suitable composition, such as coal tar, wood tar,
charcoal in fine powder, oil of wood tar, coal or coke in fine powder, raw petro-
leum, fine sawdust and powdered salammonia, with all or any of the above liquids
thickly mixed together in proper proportions, through which I pass the sheets or plates
of metal until they are thoroughly conted therewith, after which as they come out
of the bath chamber at the delivery end they are piled evenly and packed into the
annealing boxes in the ordinary manner and then placed in the furnace, and when
at a red heat the oxide will leave the same. By employing this composition and
dispensing with the process of pickling the plates in acid, the plates are not only

page_text: preserved from oxidisation and the injurious action of the acid, but are also far
more readily coated with metal, as I avoid the action of the acid on the plates
entering the grease or flux on the coating end of the bath, which is requisite to be
free from all such action to be readily coated with metals. The plates are then
placed in a rotary bath with divisions in it to keep each plate separate and filled
with grease preparatory to coating.
In order to effect this latter operation I pass the sheets to be so coated through
a single bath, preferably of a semi hexagon shape, containing the molten metal, and
which bath is provided with a series of guides extending from end to end of the
space occupied by the molten metal.
These guides are movable and are so arranged that they work in suitable
grooves formed in the sides of the bath for that purpose. Such bath forms a
narrow chamber which is provided with narrow slits or openings at the top in
order to preserve the surface of the metal from oxidisation by protecting the larger
portion of it from the action of the atmosphere, and so containing but a small
quantity of the molten metal through which the plates are passed by the guides
already mentioned. Such guides are fitted with an endless band of steel or other
suitable material, so arranged as to work freely and provided with studs, and on
the plates being placed in the guides and against the studs an onward motion is
imparted to the endless band, and so each plate in succession is passed forward
through the molten metal. If desired such endless band may be caused to revolve
by machinery.
As the plates emerge from the metal bath they pass between suitable lips which
form wipers or polishers which can be worked either by hand or machinery as
preferred.
These wipers or polishers are caused to open slightly until the plate is seized by
a pair of rollers, after which such wipers again close tightly on the plate, and thus
automatically remove whatever scruf or impurities remain thereon, an operation
which at present cannot be performed save by the workman applying his brush
thereto.
For another class of work I use two pairs instead of a single pair of rollers, and
in this case I so arrange the mechanism that the lower pair of rollers are arrested
in their motion as soon as the metal sheet or plate is caught by the upper pair.
By this means the surfaces of the plates are improved, while less metal is left on
them, as they prevent all impurities or scruf entering into the upper or finishing
pair of rollers.
In this improved apparatus I can so arrange it if desired as to enable me to coat
and finish several sheets or plates at one time in a single metal bath by placing a
series of guides one above another, and in such case I employ a pair of rollers
with wipers or polishers for each set of guides I place in the bath.
Another advantage of my improved apparatus is that I dispense with the com-
plication of machinery working in molten metal, as the action of machinery
revolving in metal as heretofore used has been found to cause the accumulation of
scruf and waste of metal, and very uncertain in its action.
I would here remark also that I so arrange the finishing end of the bath as to
give the sheets or plates a second or third dip, after which they are passed between
a similar apparatus for the purpose of wiping and polishing them as hereinbefore
described.
I may mention I prefer for terne plates (though the same may be used for tin
plates) a circular bath containing molten metal with two grease pots forming a
double machine placed at opposite sides, into which I put the plates on edge singly,
which are then carried round by a circular motion until they come under one or
other of the grease pots, when they are seized by a pair of conical rollers and
passed upwards through a finishing apparatus.
In connection with the above described grease pots, I place upon the body of the
grease a lighter fluid or oil, such as petroleum or naptha, or any other suitable

page_text: liquids that will float on the same so as to wash off the grease that would remain
on the plate otherwise, by the effect of which I dispense with the handling and
branning as used in the old process. The plates are then passed through a self
feeding dusting apparatus and are finished.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Albert Johns in the Great Seal Patent Office on the 14th
November 1879.
WILLIAM ALBERT JOHNS, of Gilwern, in the County of Brecon, Metal Refiner.
"IMPROVEMENTS IN THE MANUFACTURE OF TIN AND TERNE PLATES, AND IN THE
APPARATUS USED THEREFOR."
This Invention has for its object improvements in the manufacture of tin and
terne plates, and in the apparatus used therefor, and relates more particularly to
dispensing with the machinery and manipulation hitherto requisite for cleaning
and coating sheets or plates of steel, iron, or other metal with tin or terne metal
or alloy.
In order to clean such plates ready for coating, I pass them singly through a
conveniently formed chamber from end to end, and in the lower portion of which
chamber a suitable acid is contained, while that end of the chamber where the
plates are introduced extends upwards in an elongated curvilinear form, and is
provided with slotted guides through which the plates are passed down successively
into the acid bath, and pass out at the other end of the chamber into a water bath.
When cleaning without acids I place in the lower portion of such chamber a
suitable composition, such as coal tar, wood tar, charcoal in fine powder, oil of wood,
tar, coal or coke in fine powder, raw petroleum, fine sawdust, and powdered
salammonia, with all or any of the above liquids thickly mixed together in proper
proportions, through which I pass the sheets or plates of metal until they are
thoroughly coated therewith, after which as they come out of the bath chamber at
the delivery end they are piled evenly and packed into the annealing boxes in the
ordinary manner, and then placed in the furnace, and when at a red heat the oxide
will leave the same. By employing this composition and dispensing with the
process of pickling the plates in acid the plates are not only preserved from
oxidisation and the injurious action of the acid, but are also far more readily
coated with inetal, as I avoid the action of the acid on the plates entering the
grease or flux on the coating end of the bath, which is requisite to be free from all
such action to be readily coated with metals. The plates are then placed in a
rotary bath with divisions in it, to keep cach plate separate and filled with grease
preparatory to coating.
In order to effect this latter operation, I pass the sheets to be coated through a
single bath, preferably of a semi-hexagon shape, containing the molten metal, and
which bath is provided with a series of guides extending from end to end of the,

page_text: space occupied by the molten metal. These guides are movable, and are so
arranged that they work in suitable grooves formed in the sides of the bath for
that purpose; such bath forms a narrow chamber which is provided with narrow
slits or openings at the top, in order to preserve the surface of the metal from
oxidisation by protecting the larger portion of it from the action of the atmosphere,
and so containing but a small quantity of the molten metal through which the
plates are passed by the guides already mentioned; such guides are fitted with an
endless band of steel or other suitable material, so arranged as to work freely and
provided with studs, and on the plates being placed in the guides and against the
studs, an onward motion is imparted to the endless band, and so each plate in
succession is passed forward through the molten metal. If desired such endless
band may be caused to revolve by machinery.
As the plates emerge from the metal bath they pass between suitable lips,
which form wipers or polishers which can be worked either by hand or machinery
as preferred.
These wipers or polishers are caused to open slightly until the plate is seized by
a pair of rollers, after which such wipers again close tightly on the plate, and thus
automatically remove whatever scruf or impurities remain thereon, an operation
which at present cannot be performed save by the workman applying his brush
thereto.
For another class of work, I use two pairs instead of a single pair of rollers, and
in this case I so arrange the mechanism that the lower pair of rollers are arrested
in their motion as soon as the metal sheet or plate is caught by the upper pair.
By this means the surfaces of the plates are improved while less metal is left on
them, as they prevent all impurities or scruf entering into the upper or finishing
pair of rollers.
In this improved, apparatus I can so arrange it, if desired, as to enable me to
coat and finish several sheets or plates at one time in a single metal bath by
placing a series of guides one above another, and in such case I employ a pair of
rollers with wipers or polishers for cach set of guides I place in the bath.
Another advantage of my improved apparatus is, that I dispense with the
complication of machinery working in molten metal. As the action of machinery
revolving in metal as heretofore used has been found to cause the accumulation
of scruf and waste of metal, and very uncertain in its action.
I would here remark also that I so arrange the finishing end of the bath as to
give the sheets or plates a second or third dip, after which they are passed between
a similar apparatus for the purpose of wiping and polishing them as hereinbefore
described.
I may mention, I prefer for terne plates, (though the same may be used for tin
plates,) a circular bath containing molten metal with two grease pots forming a
double machine placed at opposite sides, into which I put the plates on edge singly,
which are then carried round by a circular motion until they come under one or
other of the grease pots, when they are seized by a pair of conical rollers and
passed upwards through a finishing apparatus.
In connection with the above described grease pots, I place upon the body of
the grease a lighter fluid or oil, such as petroleum or naphtha, or any other
suitable liquids that will float on the same so as to wash off the grease that would
remain on the plate otherwise, by the effect of which I dispense with the handling
and branning as used in the old process. The plates are then passed through a
self-feeding dusting apparatus and are finished.
In order that my said Invention may be fully understood, I shall now proceed to
particularly describe the same, and for that purpose shall refer to the several
Figures on the annexed Sheets of Drawings, the same letters of reference indicating
corresponding parts in all the Figures.
Figure 1 on the first Sheet of Drawings represents a longitudinal vertical section
of a chamber containing acid or composition for the preparing of the plates of steel
or iron for the coating.

page_text: Figure 2 is a transverse vertical section of the chamber, Figure 1; A, A, is the
chamber or bath; B, B, B, are the guides for conducting the plates through the acid or
composition; C, C, and C are arms which can be made to revolve on a central
shaft for clearing out the plates from the bath when desired; D, D, are cast iron
pedestals for supporting the bath; E is the steam pipe for introducing steam into
the acid or composition; F is a cover to preserve the plates from coming in contact
with the atmosphere in passing from one bath to the other; G is a water bath;
His a platform; I is a lever worked by the handle K for keeping the plates from
moving forward until desired.
Figure 3 is a longitudinal vertical section of a metal bath, through which the
plates are passed to be coated with tin or terne metal. A, A, A, A, A, A, A, A, are
rollers for conducting the plates out of the metal and grease bath; B, B, are a pair
of rollers which draw up the plates between the wipers C, C, until caught between
the nip of rollers A, A, after which their revolving motion can be arrested by means
of the handle L, which would thereby cause them to act as wipers. The wipers C, C,
are hinged upon the spindles of the rollers B, B, and can be opened or closed as
desired by means of a bandle or lever, which is not shewn on the Drawing. D, D, D,
are light iron frames for carrying slight steel blades or other suitable material, so
arranged as to bear on the surface of the sheet, and thereby remove all scruf or
impurities remaining on its surface; they also act as guides for conducting the plates
into the rollers or out of the bath. E', E', are two slotted guides placed at each
side of the bath and fixed in a frame. Both these guides are filled with plates
passed singly in succession through the slots, which arrangement allows them
sufficient time to be well soaked in the metal when working a heavy gauge of plate,
and are then passed out of the guides into the finishing apparatus alternately, that
is to say, as one plate is pushed into the entering end of the upper guide another
passes out of the finishing end into the finishing apparatus; then the next plate is
pushed into the entering end of the lower guide, and consequently causes another
to pass out at the finishing end of that guide, and so, as will be readily understood,
the plates in the bath can be caused to pass into the finishing apparatus at the will
of the workman in charge of the machine. E2, E2, is a single pair of slotted guides,
placed one on each side of the bath, and fixed in the same frames as E', E¹, between
these guides, and held by the same frames is a bearing guide R slotted on its upper
face, and through which travels freely an endless band or wire, upon which are
fastened studs or projections, such studs or projections being guided and caused to
travel at right angles with the plates by the slot before mentioned. The studs or
projections are made to project a little above the top of the bearing guide, so that
when a plate is entered into the entering end of the slotted side guides and against
one of the studs in the bearing guide, an onward motion will be imparted to the
stud, and consequently as each plate is inserted and pushed on at the entering end
of the guides, a corresponding plate will be passed out at the finishing end into the
finishing apparatus. I is a grease bath or chamber, into which plates are dropped
after being passed through the guides E2, E2, and coated; they are then lifted by
means of a cradle or other method, and caused to pass through the finishing appa-
ratus B, B, and A, A. K, K, are two wells, into which fresh grease can be put to
be seasoned; H is a chamber to hold metal or grease as desired; L, L, are levers,
one end of each of which is attached to each side of the guide frame O; T is a light
iron shell to contain grease, or a composition preparatory for coating.
Figures 4 and 5 are sections of different forms of wipers, which can be advan-
tageously used when working long sheets. When in operation the sheet will be
allowed to enter the rollers A, A; then by means of the lever C the wiper B can be
closed tightly upon the surface of the plate, and thus prevent any scruf from entering
the finishing rollers A, A.
Figures 6 and 7 shew end views of the sheets, with a part of their ends turned
up slightly, so as to prevent the succeeding sheets from passing or overlapping them
when being passed through the guides in the bath.

page_text: Figure 8 shews a longitudinal vertical section of the bath containing the molten
metal, and the machinery for finishing the sheets with tin or terne metal.
Figure 9 is a transverse vertical section; and
Figure 10 is a plan of the same machine. A, A, A, A, A, A, are the finishing
rollers; B, B, and B, B, are the equalizers. The outer ones of each pair are made
to move horizontally in parallel guides at the will of the workman attending to the
machine by means of the hand lever D2, the connecting link D', and lever C, or it
may be fastened in one position suitable to the class of work required by means of
the set pin W, which can be screwed down on the outer part of the connecting link
D¹, where it works through the bracket a. The inner equalizer of each pair can
also be made to move if desired, but preferably are fixed. Z forms a distance bar
between both sides of the machine, and also a hinge upon which the whole finishing
apparatus can be turned out of the bath when required; K, K, and K', K', are
spring levers for adjusting the rollers; K², K, K², K, are adjusting nuts for the
spring levers; N is an indicator by which the workman can adjust the equalizer
to any gauge required; G, G, G, is the bath; H is a grease or metal chamber;
I is a grease bath or chamber, into which the sheets are passed from between
the second and third roller, and then raised upwards in the ordinary way and
passed between the equalizers B, B, and rollers A, A; V, V, are two wooden or
composition rollers geared into each other by means of light wheels, and if pre-
ferred can be driven by any suitable arrangement for feeding the sheets into the
guides E', E¹, E¹, E¹; T is a light cast or wrought iron box to contain grease or
composition; E', E', E', E', are slotted side guides for conducting the sheets
through the molten metal to the before described finishing apparatus; R, R, are
central bearing guides, slotted on their inner or upper faces, and through which
an endless band or wire travels freely, as before described in Figure 3; 0, 0, are
frames for carrying the side and centre guides, both ends of which are slotted
to travel on the radial guide bars H2, H2, which are fastened to each side of the
bath; L, L, are two levers, one end of each being attached to one of the frames
O, and the other ends to the spindle S; M is a hand lever attached to the end
of the spindle S for raising the frames 0, 0, 0, and guides E¹, E', E¹, E', and
R, R, out of the metal bath. This arrangement is designed to enable the workman
to readily inspect or adjust any of the guides or bands during the working hours
without causing any delay.
This machine is designed to enable two sheets or more to be passed through
the bath and finishing apparatus at the same time, as will readily be seen in the
section shown at Figure 9.
Figures 11 and 12 shew front and side views of an apparatus for raising clean
molten metal from the bath to feed the rollers, or equalizers, or sheets, as they pass
upwards between the finishing apparatus.
Figure 13 is a longitudinal vertical section of a double bath and finishing appa-
ratus, which may be used for two classes of work at the same time; the cheaper
class may be passed through the upper portion of the apparatus, and the better
class in the lower portion of the molten metal, and then may be dipped again into
the grease bath I, and then passed upwards through the finishing apparatus A, A,
A, A, and B, B.
I may mention that the cheaper class of work may be passed through the same
finishing apparatus as the better class, if desired.
A, A, A, A, A, A, A, A, are rollers, B, B, and B, B, are wipers or polishers, which
can be made hollow, and into which molten metal is raised by the apparatus
described in Figure 12, which molten metal would be allowed to escape through
openings on to the sheets as they pass through the apparatus, such openings not
being shewn on the Drawing. By this arrangement the sheets may have lighter or
heavier coating of metal on their surface, as may be required. C, C, are light guides
with wipers on their inner faces to prevent any scruf or impurities from passing
upwards into the finishing apparatus. D', D, are levers for working or adjusting

page_text: the before described wipers or polishers. L, L, are quadrant levers to which the
lifting apparatus is attached, such lifting apparatus not being shewn on the Drawing.
S is a spindle to which the said quadrants are fastened. P is a spindle giving
motion to the machinery. K, K, are wells for grease. Gis the bath. G is a bath
containing metal for sealing grease in finishing bath I.
Hand H are hollow cham-
bers dropped into the metal bath so as to form a narrow metal chamber. T¹ and T
are grease or composition boxes. V, V, are two feeding rollers. E', E', are a pair of
slotted guides, placed one on each side of the bath, to conduct the sheets through
the metal as before described in Figure 3. R is a central guide slotted from end to
end, and through which are or any other suitable contrivance with projecting
studs thereon may work frey. F is a wire to which are attached studs or pro-
jections for separating the plates as they pass through the bath. E2, E2, are slotted
guides, two being placed on each side of the bath, and held in position by the two
frames O, O, such frames being fastened to the chamber piece H².
I will here remark that a system of radial arms or wires for separating the sheets,
something similar to that described in my pickling apparatus, or an arrangement
of small dise wheels with grooved edges like those described in Figure 18 of my
cleaning apparatus, may be used for passing the sheets through the metal bath, after
which they can be passed into a finishing grease bath and apparatus, as hereinbefore
described.
Figure 16 shews a sectional elevation of a rotary bath which contains grease or
composition, preparatory for coating. A is a pivot fixed to the foot plate C. B is
the bath. D, D, D, D, are projections for separating the sheets.
Figure 14 is a plan view of a circular terning bath, and Figure 15 is a sectional
elevation of the same machine. I, I, are grease baths placed diametrically opposite
each other. G, G, G, is the bath, in the upper part of which, and above the grease
baths, are the finishing apparatus. A, A, A, A, A, A, are the rollers. B, B, are the
wipers or polishers, one of which may be made to move by means of the lever D.
C, C, are guide rods for guiding the sheets into the grease baths I, I. P, P, are the
spindles for driving the finishing apparatus. H, H, is the trough or chamber con-
taining the molten metal. E, E, are small rollers placed at the bottom of the said
trough or chamber, and upon which will travel the platform F, F, carrying the sheets
with it as shewn by letter Z', such sheets being kept in a vertical position by the
light frames L, L, or the platform may be stationary and the plates caused to move
forward until under the finishing apparatus by crossing them alternately, as shewn
by letters Z2, Z3 M, M, are plates fixed on the top of the trough or chamber, and
in the centre of which is a groove through which the sheets are passed downward
into the molten metal. N is a crossbar carrying the pivot O. S, S, are levers
working on the pivot O, and causing the travelling notion to be given to the plat-
form F. Z, Z, Z, Z, on Figure 14 show position of sheets on the platform F when
being carried forward in the molten metal, and as cach sheet arrives immediately
under the finishing apparatus it is caught and lifted up by means of a lever, not
shewn in the Drawing, until received into the nip of the rollers A, A.
I may here remark that the wipers B, B, may be made of any other suitable form,
as I do not confine myself to the shape shewn in Figure 15.
The sheets will be lifted in the grease baths L, L, up to the finishing apparatus
by means of a cradle or any other suitable contrivance.
Figure 17 is a transverse sectional elevation of a cleaning or dusting apparatus,
and Figure 18 is a longitudinal half sectional elevation of the same apparatus. The
sheets are inserted in the centre of the boxes E and F, which contains any suitable
absorbing dust. G is a pair of wiping lips made of any suitable material. I, I, I, I,
are fine brushes to which a quick motion will be given. A, A, A, A, are circular
formed brushes which revolve at a high speed in the same direction on the spindles
S, S. C, C, C, C, are disc wheels, slightly V grooved on their edges, and driven by
the worm gearing 0, 0, 0, 0, which causes the sheets to travel downwards between
the faces of the circular brushes A, A. Z, Z, are two thin iron guides, with their
inner edges grooved, for guiding the sheet in its downward course between the top .

page_text: and bottom pair of the disc wheels. B, B, the shell for enclosing the revolving
brushes. D, D, is the table for carrying the apparatus. V, V, are the brackets for
carrying the disc wheels C, C, C, C, and worm wheels 0, 0, 0, O. H¹, H¹, H², H,
are the driving pulleys. K is the transverse driving spindle. P, P, are mitre
wheels for driving the worm gearing. L is an adjusting screw for the bracket V.
The sheets, after passing through the apparatus shewn at Figure 18, drop on to a
wide travelling band not shewn on the Drawing, thus obviating the handling of the
sheets when cleaned. I would here observe, the action of the above described
apparatus may be reversed, and the sheets either passed upwards or at an other
angle, as preferred.
Having now described and particularly ascertained the nature of my said Inven-
tion, and the manner in which the same is or may be used or carried into effect, I
would observe in conclusion that what I consider to be novel and original, and
therefore claim as the Invention secured to me by the hereinbefore in part recited
Letters Patent is,―
1st. The improved construction, arrangement, and combination of apparatus for
preparing, coating, and cleaning sheets or plates of steel or iron with tin or terne
metal, as herein before described and illustrated.
2nd. The application and use of a preparing chamber supplied with acid or other
suitable composition for cleaning the sheets preparatory to coating them with tin
or terne metal, and fitted with internal guides, along or through which the sheets
to be tinned are first caused to pass in the manner herein before described and
illustrated.
1
3rd. The improved arrangements for, and method of feeding, guiding, and pro-
pelling the sheets through the preparing and coating baths in such a manner as to
obviate the use of any complicated machinery in the baths, and whereby such sheets
may be allowed to remain any desired length of time in either or any of the said
baths, as hereinbefore described and illustrated.
4th. The improved construction of tinning baths, with their several arrangements
of internal guides and swivelling feeding apparatus, as herein before described and
illustrated.
5th. The combination with the tinning baths of an enlarged end containing an
up and down motion, with hinged side frames carrying rollers and wipers or
polishers for taking off all scruf and surplus metal, in the manner hereinbefore
described and illustrated.
6th. The application and use of the improved wipers herein before mentioned, in
the manner and for the purposes herein before described and illustrated.
7th. The combination of a light box with a pair of light rollers for feeding and
greasing the sheets as they enter into the coating metal, as hereinbefore described
and illustrated.
8th. The improved arrangement by which the guides may be readily withdrawn
from and replaced in the metal bath, as herein before described and illustrated.
9th. The arrangement of a central slotted guide in combination with the slotted
side guides, through which a wire or band may freely travel, as hereinbefore
described and illustrated.
10th. In combination with the tinning and finishing apparatus herein before
mentioned, a light spindle and quadrant levers, to which are attached a lifting
apparatus, as hereinbefore described and illustrated.
11th. In combination with the finishing polishers and rollers, a feeding apparatus
for feeding such finishing rollers and polishers or sheets with clean molten metal, as
herein before described and illustrated.
12th. The application and use of a liquid or spirit, such as naphtha, petroleum, or
other equivalent, for removing grease off the tin or terne plates, as herein before
specified.
13th. The improved construction and arrangement of apparatus for cleaning and
polishing the tinned plates as fast as they issue from the tinning bath, as herein-
before described and illustrated.

page_text: 14th. The improved construction and combination of a circular metal bath, with
one or more finishing grease baths and machinery, in which the sheets are coated
while travelling edgeways through the molten metal, after which they are raised
and passed through the finishing apparatus, as hereinbefore described and
illustrated.
15th. The use, in combination with the molten coating metal bath with slotted
guides through which the plates travel from end to end as herein before mentioned,
of an intermediate bath of molten metal and finishing grease bath, together with
the improved lifting and finishing apparatus, all substantially as herein before
described and illustrated.
In witness whereof, I, the said William Albert Johns, have hereunto set my
hand and seal, this Seventh day of November, in the year of our Lord One
thousand eight hundred and seventy nine.
WILLIAM ALBERT JOHNS. (LS.)