IMPROVE- MENTS IN THE MANUFACTURE OF COVERED OR INSULATED WIRE AND IN APPARATUS OR MACHINERY THEREFOR
Year: 1882

page_text: LETTERS PATENT to Alfred Julius Boult, of the firm of W. P. Thompson
& Boult, Agents for Foreign Patent Solicitors, of 323 High Holborn, London,
in the County of Middlesex and 6 Lord Street, Liverpool, in the County
of Lancaster for an
Invention
PROVISIONAL SPECIFICATION left by the said Alfred Julius Boult at the
Office of the Commissioners of Patents on the 18th March 1882.
ALFRED JULIUS BOULT of the firm of W. P. Thompson & Boult, Agents for
Foreign Patent Solicitors, of 323 High Holborn, London in the County of
Middlesex and 6 Lord Street Liverpool in the County of Lancaster "IMPROVE-
MENTS IN THE MANUFACTURE OF COVERED OR INSULATED WIRE AND IN APPARATUS
OR MACHINERY THEREFOR," [A communication from abroad by Joseph Drew
Thomas and Leonard F. Requa, both of the City and State of New York, United
States of America.]
This invention relates to improvements in covering or coating wire for electrical
and other purposes and in machinery or apparatus for effecting the same
According to one part of this invention the wire is covered, first with a layer of
india rubber or the like, then with a layer of cord, tape or the like which may be
tarred or otherwise waterproofed and finally with a second layer of indiarubber.
Another part of this invention relates to an improved machine or apparatus
particularly adapted for covering wire in the manner above described.
The said machine is constructed as follows:
On a suitable base or frame two pairs or sets of rollers are mounted at a certain
distance apart. The rollers of each pair are geared together and are mounted and
journalled in standards with tightening screws etc. in the ordinary manner which
needs no specific description. Motion is imparted to the machine by a driving belt

page_text: which passes over a driving pulley on the shaft of the lower roller of the first
pair. This pulley is loose upon the shaft but engaged therewith by a friction
clutch of any suitable construction as will be readily understood. One set of rolls
is driven from the other set by a belt which passes around pulleys on the shaft of
the lower roller in each set. These pulleys are also frictionally connected with
their shaft by an adjustable friction band or clutch so that they can be set to any
desired strain. This frictional driving connection of the rollers with each other
is preferable to a positive connection as it prevents injurious strains on the wire
or its covering while in action and enables the action of the machine to be more
easily regulated.
Now before further describing the construction and action of the machine it
may be proper more exactly to describe the covering which the machine is designed
to apply. To the naked wire two longitudinal strips of rubber or similar material
are applied which strips are each of a width equal to half the circumference of the
wire or slightly more and are curved closely around the wire and joined at the
edges thus completely enveloping the wire. Around this rubber coat is wound a
cord or tape saturated with some suitable waterproof cement and upon this
intermediate coating is placed a second coating of rubber formed in two semi
circumferential strips joined at the edges like the first coating
The machine is preferably designed to cover a series of wires simultaneously in
the manner described, and of different sizes as will be understood. The rollers are
hence provided with a corresponding series of grooves which are separated some
distance from each other and are of course of such a size as to equal the diameter
of the wire plus the thickness of the covering applied thereto. Above and below
each pair of rollers and on the receiving sides of the same is arranged a line of
independent bobbins corresponding with the grooves of the rollers each bobbin
being mounted in a suitable holder which is adjustable on bars so that the
bobbins may be set in exact relation to or coincident with the grooves of the
rollers The strips of rubber with which the wires are to be covered are wound
upon and drawn from these bobbins each of which contains one long closely coiled
strip of the right width to cover half the circumference of the wire as before stated
and the bobbins have of course a suitable tension device to retard the unwinding
of the strips therefrom as usual in similar cases. In front of the first set of rollers
is arranged a guide plate which is perforated with holes in line with the grooves
of the rollers at the junction line of the same through which holes the naked wires
are drawn from reels and thence guided into the coinciding grooves of the meeting
rollers. When the wires are thus entered between the first pair of rollers the
rubber strips are drawn from their bobbins guided into the grooves of the rollers
and meet around the wire at the junction of the rollers. If the machine is now
set in motion, the rubber strips and the wires will be drawn through between the
revolving rollers and the strips will be thereby curved around the wires on two
sides, meet at the edges and thus firmly pressed and united around the wire so as
to envelop it in a perfect homogeneous tube of rubber in a very rapid and certain
manner. The rubber strips when thus applied are of course unvulcanized while
the rollers are heated sufficiently to soften the rubber and render it adhesive and
the strips are made a little wider or thicker than necessary to fill the grooves of
the rollers so that when thus pressed around the wire the strips will unite perfectly
at their meeting edges and will be slightly compressed around the wire so as to
ensure a perfect formation to the grooves of the rollers and close adhesion to the
wire The rubber strips in passing from the bobbins lay in the grooves of the
rollers for about one quarter of the circumference and the tension on the strips will
thus cause them to become curved or bent into the grooves so as to be formed into
semi-tubes as they approach the wire and thus adapted to the exact shape of the
wire in advance of their entry between the rollers and their compression or union
upon the wire thereby causing the flat strips to be guided in a simple and perfect
manner into the grooves of the rollers and around the wire and preventing all
danger of fouling as will be readily understood. It may also be noted that the

page_text: rollers are so shaped that a relief groove is cut on either side of the forming groove
and that the forming grooves have cutting edges which meet together at the
junction line and discharge into the relief grooves Hence by this arrangement
the rubber will always be sufficiently compressed to form perfectly around the wire
without being possible to compress it too much and all surplus will have free
escape at the relief grooves and will be cut off smoothly by the cutting edges, so
that the wire will issue with a perfectly cylindrical coating of rubber of uniform
thickness all around the wire and with a smooth exterior. Whereas if the forming
grooves were to closely adjoin with cutting edges only between them, adapted to
press wide sheets of rubber around a series of wires at the same time and sever the
sheets between the wires as heretofore proposed, the material would have to be
displaced or compressed too much between the wires particularly if the coating
were thick and no relief being provided at the point of compression the covering
would tend to expand after leaving the rollers producing an irregular rough or
misshapen exterior or the rubber would form in a bunch in advance of the rollers
and clog their action which serious objections are, by this system completely
obviated and rapid and perfect work ensured whether the covering be thick
or thin.
Now when the wires are drawn through the first set of rollers and receive their
first coating of rubber as described they are next guided through hollow spindles
mounted in bearings on standards which rise from the base between the two sets
of rollers These spindles are centred in exact line with the path of the wires
from one set of rollers to the other and they are revolved by belts which are driven
from a drum and pass around pulleys on hollow spindles From that side of each
pulley which is turned toward the first set of rollers projects a crank pin on which
is mounted a bobbin which contains a coil of tape or other fibrous material which
when the spindle revolves, will thus become wound spirally around the rubber
coated wire as it issues from the first set of rolls. This tape is preferably of
ordinary woven cotton saturated with Stockholm tar and so laid upon the wire
that its edges will slightly overlap and sufficiently warmed as it winds upon the
rubber coated wire to soften the tar and render it adhesive so as to insure a
perfectly watertight covering. Instead of Stockholm tar however asphaltum
shellac or other similar cement may be used and instead of woven tape a saturated
cord or a strip of saturated paper may be used but the tarred tape preferable.
As the wires leave the winding spindles they are next guided over a grooved roller
arranged in front of the second set of rolls and being now provided with the first
coating of rubber and the intermediate coating of tape they are then passed
through the second set of rollers where a second set of rubber strips is drawn from
other bobbins and thus formed around the wire in the same manner as the first
thus applying a second and final coat of rubber over the first rubber coat and the
intermediate tape The inner coat of rubber is by preference thinner and of a
purer quality than the outer, but this is not essential.
The grooved roller just mentioned serves not only to guide the wires to the
forming rollers but also stops the vibration of the wires as they enter the rollers
and thus ensures smooth action.
The now completely covered wires after leaving the last rollers pass over a felt
covered guide drum and thence descend to the vulcanizing rooms or ovens where
they are laid in large coils until a full charge or certain length of covered wire is
passed through, say one or several miles in length, when the machine may be
stopped for the day and the product vulcanized after which the wire is ready
for use.
It will therefore be seen that by this system each wire is covered separately or
independently and a whole series of differently sized wires may be thus sinul-
taneously covered by the one machine in a very rapid and simple manner the
action being of such a simple direct nature that there is little liability of clog or
derangement at any point.
The product of the machine when finished and vulcanized will be a perfectly

page_text: covered wire with a firm impenetrable coat perfectly uniform around the wire and
smooth and regular on the exterior. The two homogeneous rubber coatings with
the intermediate tarred envelope form a perfect protection both against electrical
leakage and against the penetration of moisture to the wire, so that the wire thus
protected is thoroughly adapted for permanent underground circuits for telegraphic
or electric-lighting purposes as well as for temporary circuits laid overhead or on
the surface of the ground, such as for military telegraphs etc. The wires may not
only be laid upon the surface of the ground but also in gutters or carried through
streams without objection and vehicles may be run over it upon the ground
without much danger of injury, thus presenting important advantages for many
purposes.
The winding spindles of the machine are arranged in stepped or diagonal position
between the two sets of rollers which arrangement gives sufficient room for the
revolution of the several spindles with their bobbins, yet allows the wires to be run
comparatively close together so that a whole series of wires may be covered simul-
taneously by the same machine without employing very long rollers. The driving
drum from which the spindles are driven is revolved by bevel gearing and a belt
from a pulley on the shaft of the lower roller in the second set.
The rollers are hollow and connected with steam and water pipes through
suitable tubes and cocks in the manner usual in similar cases so that steam or
water may be admitted to the interior of the rolls to heat or cool them as will be
understood.
The machine might be adapted to form a single rubber strip around the wire of
a width equal to the circumference thereof, thus making but one joint on one side
of the wire but this strip would be much more difficult to guide into the grooves
of the rollers and to form around the wire and would be much more likely to clog
or foul, whereas the two semicircumferential strips may be formed around the
wire in the simplest and most perfect manner without any danger of fouling. In
case however a single circumferential strip is used only one cutting edge and one
relief groove would be required to each forming groove of the rollers; but this
modification is not recommended.
I have described the covering strips as being of unvulcanized rubber, vulcanized
after application, which is a very desirable material but any similar or equivalent
material may be employed if found suitable.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Alfred Julius Boult in the Great Seal Patent Office on the
18th September 1882.
ALFRED JULIUS BOULT of firm of WP Thompson and Boult, Agents for
Foreign Patent Solicitors of 323 High Holborn London in the County of
Middlesex and 6 Lord Street Liverpool in the County of Lancaster "IMPROVE-
MENTS IN THE MANUFACTURE OF COVERED OR INSULATED WIRE AND IN APPARATUS
OR MACHINERY THEREFOR
"
communication from abroad by Joseph Drew
Thomas and Leonard F. Requa both of the city and state of New York United
States of America.
Wires for electrical purposes as is well known have been covered with rubber or
rubber like coatings for insulation and protection in a variety of ways. One
method is by plunging or dipping the wire in a bath of the dissolved or plastic
covering material. another is to wind spirally onto the wire an unvulcanized strip
of rubber which is afterwards vulcanized. A later method passes a series of closely
adjoining wires simultaneously between two unvulcanized rubber sheets which
are then drawn between grooved rollers which presses or form the sheets around
each wire and at the same time sever the sheet between each wire. The present
invention includes an improved mode of covering wires and improved machinery
therefor. The mode has some relation to that last named but is an improvement
thereon in that by this machine I cover a series of wires at the same time each
wire independently with two separate longitudinal strips of rubber each strip
having a width equal to half the circumference of the wire which strips are curved
around the wire and joined together at the edges by passage between multi
grooved rolls, whereby much more perfect and accurate work is accomplished and
one set of rolls may be formed to cover a whole series of differently sized wires
simultaneously which is not the case with the former system. I also apply two
successive coatings of this kind to the wire with an intermediate winding of tarred
or cemented tape or cord between the two rubber coverings.
The covering
apparatus consists briefly of two successive series of grooved rollers with separate
bobbins carrying the narrow rubber strips mounted in operative relation with the
separate grooves of the rollers and with tape winding devices between the two sets
of rollers whereby the wires are drawn through the first set of rolls and are covered
with one rubber coat, which is thence wound with the intermediate tape and
finally covered with a second rubber coat in passing through the second set of rolls
which operations are all performed in a continuous succesive manner.
The forming grooves of the rollers have cutting edges on each side and relief or
vent grooves are formed on either side of the cutting edges so that the strips are
pressed and formed accurately around the wires the surplus cut off at the junction
line and allowed free escape at the relief grooves, so that very perfect and rapid
work is performed. The several features here outlined embody and express the
main points of this invention which also includes a number of minor features as
hereinafter fully set forth.
In the drawings annexed Figure 1 represents a piece of wire covered according
to this invention with the covering stripped off for a portion of its length to
illustrate the construction thereof. Figure 2 presents a side elevation of the
improved machine for applying this covering and.
Figure 3 a plan view thereof

page_text: Figure 4 is a front elevation or cross section on the line x x of Figures 2 and 3.
looking to the left.
Figure 5 is an enlarged front elevation partly in section of one pair of rolls
illustrating the formation of the grooves thereof.
Referring to Figures 2 and 3 a a indicates the base or frame of the machine on
which two pairs or sets of rollers b b c c are mounted at a certain distance apart
as illustrated. The rollers of each pair are geared together and are mounted and
journalled in standards with tightening screws etc in the ordinary manner of rolls
as illustrated, which needs no specific description Motion is imparted to the
machine by the driving belt d which passes over a driving pulley d¹ on the shaft
of the lower roller of the first pair b. This pulley is loose upon the shaft but
engaged therewith by a friction clutch d" of any suitable construction as will be
understood. One set of rolls is driven from the other set by the belt e which
passes around pullies e e on the shaft of the lower roller in each set. These
pullies are also frictionally connected with this shaft by an adjustable friction band
or clutch so that they can be set to any desired strain. This frictional driving
connection of the rollers with each other is preferable to a positive connection as
it prevents injurious strains on the wire or its covering while in action and enables
the action of the machine to be more easily regulated.
Now before describing the general construction and action of the machine it
may be proper to refer to Figure 1 to describe the covering which the machine is
designed to apply. This is according to this system I first apply to the naked
wire g two longitudinal strips h h of rubber or similar material which strips are
each of a width equal to half the circumference of the wire or slightly more and
are curved closely around the wire and met and joined at the edges thus completely
enveloping the the wire. Around this rubber coat is wound a cord or tape i
saturated with some suitable waterproof cement and upon this intermediate
coating is placed a second coating of rubber formed in two semi circumferential
strips k joined at the edges in the same manner as the first coating as fully illustrated
in Figure 1.
Now the machine shown in Figures 23 and 4 is of course preferably designed
to cover a series of wires simultaneously in the manner described as seen best in
figures 3 and 4, and of different sizes as will be understood. The rollers a a
and b b are hence provided with a corresponding series of grooves which are
separated some distance from each other as shewn best in Figures 3, 4 and 5 and
are of course of such a size as to equal the diameter of the wire plus the thickness
of the covering applied thereto Above and below each pair of rollers and on the
receiving sides of the same is arranged a line of independent bobbins m m corre-
sponding with the grooves of the rollers each bobbin being mounted in a suitable
holder. which is adjustable on the bars nn so that the bobbins may be set in exact
relation to or coincident with the grooves of the rollers, as seen best in Figure 4.
The strips of rubber with which the wires are to be covered are wound upon and
drawn from these bobbins each of which contains one long closely coiled strip of
the right width to cover half the circumference of the wire as before stated and
shown best in Figures 3 and 4 and the bobbins have of course a suitable tension
device to retard the unwinding of the strips therefrom as usual in similar cases. In
front of the first set of rollers is arranged a guide plate o which is perforated with
holes in line with the grooves of the rollers at the junction line of the same through
which holes the naked wires g are drawn from the reels f and thence guided into
the coinciding grooves of the meeting rollers. When the wires are thus entered
between the first pair of rollers the rubber strips h are drawn from the bobbins m
guided into the grooves of the rollers and net around the wire at the junction of
the rollers as seen in Figures 2 and 4. If the machine is now set in motion the
rubber strips and the wires will be drawn through between the revolving rollers
and the strips will be thereby curved around the wires on two sides met together at
the edges and thus firmly pressed and united around the wire so as to envelop it

page_text: The
in a perfect homogenous tube of rubber in a very rapid and certain manner.
rubber strip when thus applied are of course unvulcanized while the rollers are
heated sufficiently to soften the rubber and render it adhesive and the strips are
made a little wider or thicker than necessary to fill the grooves of the rollers so
that when thus pressed around the wire the strips will unite perfectly at their
meeting edges and will be slightly compressed around the wire so as to ensure a
perfect formation to the grooves of the rollers and close adhesion to the wire. It
will be noted on reference to Figures 2 and 4 that the bobbins m m are arranged
above and below the rollers in a position at right angles or nearly so to the passage
of the wires between the rollers so that the rubber strips & in passing from the
bobbins m m lay in the grooves of the rollers for about one quarter of the circum-
ference and the tension on on the strips will thus cause them to become curved or
bent into the grooves so as to be formed into semi tubes as they approach the wire
and thus adapted to the exact shape of the wire in advance of their entry between
the rollers and their compression or union upon the wire thereby causing the flat
strips to be guided in a simple and perfect manner into the grooves of the rollers
and around the wire and preventing all danger of fouling as will be readily under-
stood. It may also be noted on reference to Figure 5 that the rollers are so shaped
that a relief groove p is cut on either side of the forming groove land that the
forming grooves have cutting edges which meet together at the junction line and
discharge into the relief grooves. Hence by this arrangement the rubber will
always be sufficiently compressed to form perfectly around the wire without it
being possible to compress it too much and all surplus will have free escape at the
relief grooves and will be cut off smoothly by the cutting edges so that the wire
will issue with a perfectly cylindrical coating of rubber of uniform thickness all
round the wire and with a smooth exterior. Whereas if the forming grooves were
to closely adjoin with cutting edges only between them adapted to press wide
sheets of rubber around a series of wires at the same time and sever the sheets
between the wires as heretofore proposed the material would have to be displaced or
compressed too much between the wires, particularly if the coating were thick and
no relief being provided at he point of compression the covering would tend to
expand after leaving the rollers producing an irregular rough or misshapen exterior;
or the rubber would form in a bunch in advance of the rollers and clog their
action, which serious objections are by this system, completely obviated and rapid
and perfect work insured whether the covering be thick or thin.
Now when the wires are drawn through the first set of rollers and receive
their first coating of rubber as described they are next guided through hollow
spindles mounted in bearings or standards, which rise from the base a between
the two sets of rollers. These spindles are centred in exact line with the path of
the wires from one set of rollers to the other as shown best in Figures 2 and 3
and they are revolved by belts & which are driven from the drum 8' (see
Figures 2 and 4) and pass round pulleys on the hollow spindles as illustrated.
From that side of each pulley which is turned towards the first set of rollers
projects a crank pin on which is mounted a bobbin u which contains a coil of tape
or other fibrous material which when the spindle revolves will thus become wound
spirally around the rubber coated wire on its issue from the first set of rolls as
seen best in Figure 2. This tape is preferably of ordinary woven cotton saturated
with Stockholm tar and so laid upon the wire that its edges will slightly overlap
and sufficiently warmed as it winds upon the rubber coated wire to soften the tar
and render it adhesive so as to insure a perfectly watertight covering. Instead of
Stockholm tar however asphaltum, shellac or other similar cement may be used
and instead of woven tape a saturated cord or a strip of saturated paper may be
used but the tarred tape is preferable. As the wires leave the winding spindles T
they are next guided over a grooved roller t arranged in front of the second set
of rolls and being now provided with the first coating of rubber, and the
intermediate coating of tape, they are then passed through the second set of

page_text: rollers c where a second set of rubber strips ff is drawn from the bobbins m¹ and
thus formed around the wire in the same manner as the first thus applying a
second and final coat of rubber over the first rubber coat and the intermedinte
tape. It is preferred to have the inner coat of rubber thinner and of a purer quality
than the outer but this is not essential.
The grooved roller t serves not only to guide the wires to the forming rollers
but also stops the vibration of the wires as they enter the rollers and thus ensures
smooth action.
The now completely covered wires after leaving the last rollers c pass over a felt
covered guide drum and thence descend to the vulcanizing rooms or ovens where
they are laid in large coils until a full charge or certain length of covered wire is
passed through say one or several miles in length when the machine may be
stopped for the day and the product vulcanized after which the wire is ready
for use.
.
It will therefore be seen that by this system each wire is covered separately
or independently and a whole series of differently sized wires may be thus simul-
taneously covered by the one machine in a very rapid and simple manner the
action being of such a simple direct nature that there is little liability of clog or
derangement at any point.
The product of the machine when finished and vulcanized as seen in Figure 1
will be a perfectly covered wire with a firm impenetrable coat perfectly uniform
around the wire and smooth and regular on the exterior. The two homogenous
rubber coatings with the intermediate tarred envelop form a perfect protection both
against electrical leakage and against the penetration of moisture to the wire so that
the wire thus protected is thoroughly adapted for permanent underground circuits
for telegraphic or electric lighting purposes as well as for temporary circuits laid
overhead or on the surface of the ground, such as for military telegraphs, etc.
The wire may not only be laid upon the surface of the ground but also in gutters
or carried through streams without objection and vehicles may be run over it upon
the ground without danger of injury, thus presenting important advantages for
many purposes.
It will be seen on reference to Figure 3 that the winding spindles are arranged
in stepped or diagonal position between the two sets of rollers which arrangement
as will be understood gives sufficient room for the revolution of the several
spindles with the bobbins yet allows the wires to be run comparatively close
together so that a whole series of wires may be covered simultaneously by the
same machine without employing very long rollers. The driving drum s from
which the spindles are driven is revolved by the bevel gearing wand a belt w¹
from a pulley on the shaft of the lower roller in the second set as seen best in
Figures 2 and 3.
On reference to Figure 5 it may be observed that the rollers are hollow and
connected with steam and water pipes through suitable tubes and cocks in the
manner usual in similar cases so that steam or water may be admitted to the
interior of the rolls to heat or cool them as will be understood.
I would remark that the machine might be adapted to form a single rubber strip
around the wire of a width equal to the circumference thereof, thus making but
one joint on one side of the wire but this strip would be much more difficult to
guide into the grooves of the rollers and to form around the wire and would be
much more likely to clog or foul; whereas the two semi-circumferential strips may
be formed around the wire in the simplest and most perfect manner without any
danger of fouling. In case however a single circumferential strip is used only one
cutting edge and one relief groove would be required to each formning groove of the
rollers; but I do not recommend this modification
I have described the covering strips h h k k as being of unvulcanized rubber,
vulcanized after application which is of course the most desirable material known
but any similar or equivalent material may be employed if found suitable.

page_text: am aware that, wire has been heretofore proposed to be covered with two
itudinal strips of about semi-circumferential width joined thereupon by rolls,
beretofore the machines for doing this have been designed for covering but one
e at a time, whereas this machine is designed for covering a series of differently
d wires simultaneously and independently.
[aving now described the nature of the said invention and the manner of
orming the same as communicated to me by my foreign correspondent I wish
nderstood that what I claim and desire to protect under the hereinbefore in
recited Letters Patent is:
t-A covered wire provided with two successive layers of rubber or equivalent
laid on in a longitudinal strip or strips with an intermediate spirally wound
layer of cement-saturated tape substantially as berein shown and described.
ond-A covered or insulated wire provided with an inner and an outer coating
of rubber or its equivalent, each coating being laid on in longitudinal strips
with their edges meeting, and an intermediate layer of cemented tape wound
spirally between the said inner and outer coatings with its edges spirally
overlapping, substantially as herein shown and described.
d-A machine for coating wire consisting of a pair of rollers grooved to
correspond to the wire and its coating with means for rotating the same, in
combination with a pair of bobbins each containing or adapted to contain
long covering strips of a width equal to half the circumference of the wire
the said bobbins being arranged in operative relation with the grooves of
the rollers at such an angle to the nipping faces of the rollers that the strips
passing from the bobbins curve around a portion of the circumference of
the rollers and lie in the grooves thereof in advance of the nip on the wire,
whereby the strips adapt themselves to the grooves of the roller and to
the form of the wire previous to being pressed upon the wire in passing
between the rolls substantially as herein shown and described.
rth-A machine adapted to cover a series of wires independently and simul-
taneously consisting of a pair of rollers having a series of distinct and
separated grooves corresponding to the wires, in combination with a corre-
sponding series of distinct and separate bobbins arranged in relation with
said grooves and wires, one series for each roller and adapted to contain
covering strips equal to half the circumference of the wires and so arranged
that the said strips are drawn from the bobbins on either side of the wires
and passed between the rollers so as to curve and unite each pair of strips
independently and simultaneously around the respective wires substantially
as shown and described.
-A machine for applying two successive longitudinal coatings to wire with
an intermediate wound coating, consisting of two pairs of grooved rollers
arranged at a distance apart with bobbins adapted to carry longitudinal
covering strips arranged to deliver the strips to the grooves of the rollers
and hollow rotary spindles arranged between the two sets of rollers and in
line with the passage of the wires from one to the other, with winding
bobbins carried by said spindles whereby the wires after receiving their
first longitudinal coating pass through the hollow spindles and receive a
spiral coating of tape or its equivalent from said winding bobbins and finally
pass through the second pair of rolls and receive a second longitudinal
coating substantially as herein shown and described.
h-In a machine for covering wire a pair of grooved rollers having a cutting
edge or edges on the side or sides of its forming grooves with a relief groove or
grooves outside the cutting edges substantially as and for the purpose set forth.
nth-In a wire covering machine the combination with the feeding or covering
rollers bb grooved to admit a series of separate wires, of the hollow winding
spindles and their bobbins & arranged in stepped or diagonal position
on the delivery side of the rollers substantially as and for the purpose set forth.

page_text: .
Eighth In a wire covering machine the combination with two sets of covering
rollers b b c c of the vibration preventing guide roller t arranged close to the
junction of the second set of rollers and parallel with their junction line
over which the wires from the first set of rollers pass in entering the second
set substantially as and for the purpose set forth.
In witness whereof I the said Alfred Julius Boult have hereunto set my hand
and seal this Eighteenth day of September in the year of our Lord
One thousand eight hundred and eighty two.
ATTDED T POULT (TO)
AT DE
44514W
BOULT
(1.0)