Year: 1898

page_text: We, HENRY TIMKEN and REGINALD HEINZELMAN, both of 522, Roe Building,
St. Louis, State of Missouri, United States of America, Carriage Manufacturers,
do hereby declare the nature of this invention to be as follows;
Our invention relates to roller bearings for vehicles and has for its principal
objects to reduce the friction, to provide for the adjustment of the roller bearings,
to provide for the removal of the wheel from the spindle without affecting the bear-
ing rollers, and generally to improve the construction of roller bearings."
Near the end of the axle or spindle and fitting thereon is a conical sleeve pro-
vided with annular ribs on its outer surface. Around this conical sleeve conical
rollers are provided so as to bear thereon; and each roller is provided with grooves
to correspond with the ribs on the sleeve whereby the ribs lie in such grooves. Out-
side of the rollers and arranged to bear against them is a conical shell or box in-
corporated into the outer end of the wheel.
The arrangement of the conical sleeve rollers and box just described is dupli-
cated at the inner end of the wheel's hub. The conical box at the inner end of the
hub has a cylindrical sleeve extending through the hub and adapted to receive
the outer conical shell. A shoulder on said sleeve against which the end of the
other shell abuts keeps said shells a fixed distance apart.
The conical sleeve at the inner end abuts endwise against a shoulder on the axle
and is thereby prevented from going further inwardly. The end of the axle or
spindle is screwthreaded and has a nut working thereon said nut having an
enlarged annular extension adapted to surround the axle and abut against the end
of the conical sleeve. When the nut is tightened the conical shell at the outer
end of the hub is forced inwardly while the shell at the other end remains station-
ary against the shoulder on the axle. The inward movement of the outer sleeve
is distributed through the intermediate parts of the two bearings bringing such
parts closer together and thus adjusting the bearings at both ends of the hub
simultaneously. This provision for adjustment is equally applicable to other bear-
ings than those of the conical form referred to. For instance cylindrical rollers
may be used in place of conical rollers, in which case the sleeve and the box
become cylindrical.
In the case of cylindrical rollers being used the arrangement hereinbefore
described enables the sleeve to be adjusted longitudinally on the axle whereby
the parts are forced together and prevent the lateral movement or jarring incidental
to looseness of the parts. The said adjustment consists in crowding the sleeve in
the outer end of the hub against the prolonged end of the box at the inner end,
whereby the two sleeves and the boxes are held firmly against endwise play. In
making this adjustment the rollers are all advanced evenly and their ends are free
from friction.
For the purpose of making the adjustment simple and reliable the threaded end
of the axle is made of reduced diameter so as to leave a shoulder of sufficient bear-

page_text: When
ing-surface to accomodate an annular washer mounted on the reduced portion
A series of very, thin washers is originally mounted on the reduced portion of the
axle in position to be covered by the extending annular portion of the nut.
the bearing becomes worn the washers are removed one at a time to provide a new
adjustment. This method of adjustment is quité delicate and is capable of being
used by inexperienced persons and has the important advantage of preventing to
a large degree the loosening of the nut. A modified form of this adjustment may
be employed wherein the threaded hole is cut only part way through the nut and
thus constitutes a socket and the diameter of the axle is not reduced but the thin
washers or in this case discs lie in the socket of the nut and bear against the end
of the axle instead of against a shoulder thereon.
At the inner end of the hub the dust is prevented from getting into the bear-
ings by a ring threaded to work on a thread cut in the inner surface of the conical
box. The inner surface of this ring fits over two annular ribs on the axle and a
washer between them. Another washer of felt or other suitable material is located
at the end of the conical sleeve inside of said dust ring. When the wheel is
removed from the axle the dust ring prevents the rollers from falling out of place.
A dust cap is screwed into the end of the conical box at the end of the axle.
As this dust cap covers the end of the axle and the nut thereon and must therefore
be removed to take off the wheel a split ring is fitted into the conical box in position
to keep the rollers from falling out when the wheel is removed.
The conical sleeves rollers and boxes are incorporated into the hub of the wheel
and are mounted and removed from the axle along with the wheel. The boxes are
fixed to the hub and turn therewith but the conical sleeves remain stationary on
the axle the friction being reduced by the rolling contact of the conical rollers.
The tendency of the rollers to twist or shift out of position is counteracted by the
ribs on the sleeves. These ribs are not high enough to bear normally on the sur-
face of the grooves their function being to prevent the rollers from coming out
endwise to prevent twisting to advance or retract the rollers evenly in the adjust-
ment of the bearing and to assist in resisting the lateral movement or side thrust
of the axle. When the bearing surface becomes worn a new adjustment is made
as hereinbefore mentioned by removing one of the thin washers and again tighten-
ing the nut at the end of the axle.
It is noted that in the adjustment of the bearing the endwise movement of the
rollers is effected by the sleeve through the grooved and ribbed connection and
that the ends of the rollers are at all times free from contact with other parts and
thus are always free from friction at their ends. The nut thus serving as an
adjusting nut is the same which fastens the wheel on the axle.
We shall now proceed to describe another form or type of our present invention
which differs from the foregoing in certain particulars.
Near the end of the axle or spindle and fitting thereon is a conical sleeve which
is provided with an annular rib or ribs on its outer surface and which has its ends
enlarged. Around this conical sleeve conical rollers are provided so as to bear
thereon and each roller is provided with a groove or grooves to correspond with
the rib or ribs on the sleeve whereby the ribs lie in such grooves. The inner side
or shoulder of the enlarged ends of the conical sleeve that is the side next to the
bearing surface is hollowed out so as to form an annular groove or space therein.
The ends of the rollers are abruptly reduced to a small projection which when the
roller rests on the bearing surface of the sleeve does not touch any portion of
the sleeve but lies in the groove or space in the end thereof and under the over-
hanging annular portion of said end. When the enlarged ends are made integral
with the sleeve, a notch, large enough to let the projection at the end of the roller
pass, is formed in the overhanging portion for the purpose of assembling the parts.
In the groove or space at each end of the sleeve is a raised shoulder constituting
an annular bearing surface, said shoulders extending further beyond the main
bearing surface of the conical sleeve than the ribs thereon which co-operate with
the grooves in the rollers. Between each two of the bearing rollers is a conical

page_text: roller, whose ends extend beyond the bearing rollers and rest on the raised shoulders
in the enlarged ends of the sleeve. The smaller rollers are thus entirely clear
of the main bearing surface of the sleeve and of the ribs thereon and they are
made sufficiently small to clear the outer box or casing of the bearing; which box
is embedded in the hub of the wheel. The notch in the overhanging portion of
this enlarged end is made large enough to allow of the insertion of these small
rollers.
The operation of the device is as follows: The hub of the wheel is furnished
with a cylindrical sleeve terminating at each end in a conical box whose inner
surface constitutes the outer bearing for the rollers around the corresponding
conical sleeves, it being understood that there is one conicial sleeve at each end of
the hub. The wheel is held on the axle by an ordinary carriage nut working on
a thread on the end of the axle and arranged to adjust the conical bearing sleeves.
Suitable dust caps and washers are provided as desired.
The several bearing rollers are assembled upon the conical sleeve with the
projections at their ends inside of the grooves at the ends of the sleeve and their
grooves straddling the ribs of the sleeve and with the smaller rollers arranged
alternately with them. Endwise movement of either of the conical sleeves effects
the adjustment of the bearings. When the wheel turns, the bearing rollers roll
with it upon both bearing surfaces. As the rollers are in contact with the inter-
mediate idle rollers said idle rollers are turned in a direction the reverse of the
direction of rotation of the bearing rollers; that is, the contact surfaces of the
two rollers move in the same direction. Thus the entire friction of the bearing
rollers is due to rolling contact only, and the only sliding friction in the bearing
is that due to the ends of the smaller rollers in contact with the end shoulders,
which is very slight by reason of the small area of the contact surfaces.
Other special advantages of the foregoing construction are the facility with
which the parts can be assembled and kept together while being manipulated.
In use, the overhanging end portions tend to prevent the bearing rollers from
climbing up on the ribs of the sleeve. By making the diameter of the larger
enlarged end of the conical sleeve nearly equal to the inner diameter of the corre-
sponding portion of the box or casing, said end serves as a dust cap, with which
a split ring or washer co-operates.
J. G. LORRAIN, M.I.E.E., M.I.Mech. E.,
Chartered Patent Agent.
Improvements in Roller Bearings.
We, HENRY TIMKEN and REGINALD HEINZELMAN, both of 522, Roe Building,
St. Louis, in the State of Missouri, United States of America, Carriage Manu-
facturers, 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:-
Our invention relates to roller bearings for vehicles and has for its principal
objects to reduce the friction, to provide for the adjustment of the roller bearings,
to provide for the removal of the wheel from the spindle without affecting the
bearing rollers, and generally to improve the construction of roller bearings.
In the accompanying drawings,

page_text: Figure 1 is a side view of a roller bearing adapted to be incorporated into the
hub of a wheel.
Figure 2 is a longitudinal section thereof on the line 2-2 of Figure 1, with
the axle shown in elevation.
Figure 3 is a longitudinal section of the roller box, and a side elevation of all
inside thereof.
Figure 4 is a detail view of the split ring hereinafter mentioned.
Figure 5 is a cross section on the line 5-5 of Figure 1.
Figure 6 is a detail view of the adjusting nut and washers, and
Figure 7 is a like detail of a modified form of said adjusting nut and washers.
Figure 8 is a longitudinal sectional view of a modified form of our bearing.
Figure 9 is a cross section of the sleeve on the line 9-9 of Figure 11.
Figure 10 is a cross section of the bearing mounted on the axle on the line 10-10
of Figure 8.
Figure 11 is a detail view of the bearing sleeve, showing a portion thereof in
section.
Figure 12 is a detail view of a horizontal roller, and
Figure 13 is a detail view of the intermediate idle rollers.
We shall now refer to Figures 1 to 7 inclusive.
Near the end of the axle or spindle 1 and fitting thereon is a conical sleeve 2
provided with annular ribs 3 on its outer surface. Around this conical sleeve
conical rollers are provided so as to bear thereon; and each roller is provided
with grooves to correspond with the ribs on the sleeve, whereby the ribs lie in such
grooves. Outside of the rollers, and arranged to bear against them, is a conical
shell or box 5 incorporated into the outer end of the wheel.
The arrangement of the conical sleeve rollers and box just described is dupli-
cated at the inner end of the wheel's hub. The conical box at the inner end of the
hub has a cylindrical sleeve extending through the hub and adapted to receive
the outer conical shell. A shoulder 6 on said sleeve, against which the end of
the other shell abuts, keeps said shells a fixed distance apart.
3
The conical sleeve at the inner end abuts endwise against a shoulder 7 on the
axle and is thereby prevented from going further inwardly. The end of the axle
or spindle 1 is screwthreaded and has a nut 8 working thereon, said nut having
an enlarged annular extension adapted to surround the axle and abut against the
end of the conical sleeve 2. When the nut 8 is tightened the conical shell at the a
outer end of the hub is forced inwardly, while the shell at the other end remains
stationary against the shoulder on the axle. The inward movement of the outer
sleeve is distributed through the intermediate parts of the two bearings, bringing
such parts closer together and thus adjusting the bearings at both ends of the
hub simultaneously. This provision for adjustment is applicable to other bear-
ings than those of the conical form referred to. For instance cylindrical rollers
may be used in place of conical rollers in which case the sleeve and the box
become cylindrical.
In the case of cylindrical rollers being used the arrangement hereinbefore described
enables the sleeve to be adjusted longitudinally on the axle whereby the parts are 4
forced together and prevent the lateral movement or jarring incidental to loose-
ness of the parts. The said adjustment consists in crowding the sleeve in the outer
end.of the hub against the prolonged end of the box at the inner end, whereby the
two sleeves and the boxes are held firmly against endwise play. In making this
adjustment the rollers are all advanced evenly and their ends are free from 5
friction.
There is an adjustment independent of the adjustment for the wear of the
conical rollers and bearing surfaces, hereinbefore described, by which the distances
between the bearing surfaces of the sleeve and its box may be varied. This is
a longitudinal adjustment of the sleeve on the axle whereby the parts are forced 5.
together for preventing lateral movement and jar incidental to looseness of the
parts and is common both to a conical and a cylindrical form of our invention.

page_text: For the purpose of making the adjustment simple and reliable the threaded
end of the axle is made of reduced diameter so as to leave a shoulder of sufficient
bearing surface to accommodate an annular washer mounted on the reduced
portion. A series of very thin washers 9 is originally mounted on the reduced
portion of the axle in position to be covered by the extending annular portion of
the nut. When the bearing becomes worn the washers are removed one at a time
to provide a new adjustment. This method of adjustment is quite delicate and
is capable of being used by inexperienced persons and has the important advan-
tage of preventing to a large degree the loosening of the nut. A modified form.
of this adjustment is shown in Figure 7 wherein the threaded hole is cut only
part way through the nut and thus constitutes a socket, and the diameter of the
axle is not reduced but the thin washers or, in this case, discs 9, lie in the socket
of the nut and bear against the end of the axle instead of against a shoulder
thereon.
At the inner end of the hub the dust is prevented from getting into the bearings
by a ring 10 threaded to work on a thread cut in the inner surface of the conical
box. The inner surface of this ring fits over two annular ribs 11 on the axle and
a washer 12 between them. Another washer 13 of felt or other suitable material
is located at the end of the conical sleeve inside of said dust ring. When the
wheel is removed from the axle the dust ring prevents the rollers from falling out
of place.
A dust cap 14 is screwed into the end of the conical box at the end of the axle.
As this dust cap covers the end of the axle and the nut thereon and must therefore
be removed to take off the wheel, a split ring 15 is fitted into the conical box in
position to keep the rollers from falling out when the wheel is removed.
The conical sleeves rollers and boxes are incorporated into the hub of the wheel
and are mounted and removed from the axle along with the wheel. The boxes
are fixed to the hub and turn therewith but the conical sleeves remain stationary
on the axle, the friction being reduced by the rolling contact of the conical
rollers. The tendency of the rollers to twist or shift out of position is counter-
acted by the ribs on the sleeves. These ribs are not high enough to bear normally
on the surface of the grooves, their function being to prevent the rollers from
coming out endwise, to prevent twisting, to advance or retract the rollers evenly
in the adjustment of the bearing, and to assist in resisting the lateral movement
or side thrust of the axle. When the bearing surface becomes worn, a new
adjustment is made as hereinbefore mentioned, by removing one of the thin
washers and again tightening the nut at the end of the axle.
It is noted that in the adjustment of the bearing the endwise movement of the
rollers is effected by the sleeve through the grooved and ribbed connections and that
the ends of the rollers are at all times free from contact with other parts, and thus
are always free from friction at their ends. The nut thus serving as an adjust-
ing nut is the same which fastens the wheel on the axle.
We shall now proceed to describe another type or form of our present inven-
tion which differs from the foregoing in certain particulars. This type or form
is illustrated in Figures 8 to 13 of the accompanying drawings,
Near the end of the axle or spindle 1 and fitting thereon is a conical sleeve 2
which is provided with an annular rib or ribs 3 on its outer surface and which
has its ends enlarged. Around this conical sleeve, conical rollers 4 are provided
so as to bear thereon; and each roller is provided with a groove or grooves to corre-
spond with the rib or ribs on the sleeve, whereby the ribs lie in such grooves. The
inner side or shoulder of the enlarged ends of the conical sleeve, that is, the side
next to the bearing surface, is hollowed out so as to form an annular groove or
space therein. The ends of the rollers 4 are abruptly reduced to a small pro-
jection 16 which, when the roller rests on the bearing surface of the sleeve 2
does not touch any portion of the sleeve but lies in the groove or space in the
end thereof and under the overhanging annular portion of said end. When the
enlarged ends are made integral with the sleeve, a notch 17 large enough to let

page_text: the projection at the end of the roller to pass, is formed in the overhanging portion
for the purpose of assembling the parts.
In the groove or space at each end of the sleeve is a raised shoulder 18 con-
stituting an annular bearing surface, said shoulders extending further beyond the
main bearing surface of the conical sleeve than the ribs thereon which co-operate
with the grooves in the rollers. Between each two of the bearing rollers is a
conical roller 19 whose ends extend beyond the bearing rollers and rest on the
raised shoulders in the enlarged ends of the sleeve. The smaller rollers are thus
entirely clear of the main bearing surface of the sleeve and of the ribs thereon;
and they are made sufficiently small to clear the outer box or casing 20 of the
bearing, which box is embedded in the hub of the wheel. The notch in the over-
hanging portion of this enlarged end is made large enough to allow of the inser-
tion of these small rollers.
The operation of the device is as follows:-The hub of the wheel is furnished
with cylindrical sleeve 21 terminating at each end in a conical box 20 whose
inner surface constitutes the outer bearing for the rollers 4 around the corre
sponding conical sleeves 2; it being understood that there is one conical sleeve
at each end of the hub. The wheel is held on the axle by an ordinary carriage
nut 22 working on a thread on the end of the axle and arranged to adjust the
conical bearing sleeves. Suitable dust caps and washers are provided as desired.
The several bearing rollers 4 are assembled upon the conical sleeve 2 with the
projections at their ends inside of the grooves at the ends of the sleeve and their
grooves straddling the ribs of the sleeve and with the smaller rollers arranged
alternately with them. Endwise movement of either of the conical sleeves effects
the adjustment of the bearings. When the wheel turns the bearing rollers 4 roll
with it upon both bearing surfaces. As the rollers 4 are in contact with the
intermediate idle rollers 19 said idle rollers are turned in a direction the reverse
of the direction of rotation of the bearing rollers; that is, the contact surfaces of
the two rollers move in the same direction. Thus the entire friction of the bear-
ing rollers is due to rolling contact only, and the only sliding friction in the
bearing is that due to the ends of the smaller rollers in contact with the end
shoulders, which is very slight by reason of the small area of the contact surfaces.
Other special advantages of the foregoing construction are the facility with
which the parts can be assembled and kept together while being uranipulated.
In use, the overhanging end portions tend to prevent the bearing rollers from
climbing up on the ribs of 'the sleeve. By making the diameter of the larger
enlarged end of the conical sleeve nearly equal to the inner diameter of the corre-
sponding portion of the box or casing, said end serves as a dust cap, with which
a split ring or washer 23 co-operates.
Our invention is of general use as a journal bearing and admits of divers changes
and modifications in construction, and we do not wish to be limited to its use for
vehicles or to the specific constructions shown in the drawings. For instance,
the annular ribs may be arranged on the inner surface of the roller boxes instead
of on the sleeves; or in the cylindrical form the ribs may be formed on the rollers
and the grooves in either the boxes or the sleeves. Obviously, also, in the
cylindrical form the inner bearing surface may be integral with the axle instead
of a separate sleeve, and the outer box may likewise be formed in the body of the
hub instead of separate therefrom.
Further, instead of having separate shoulders in the ends of the bearing sleeve,
the idle rollers may bear on the ribs of the sleeve. So, also, the smaller rollers
may be formed with grooves similar to those of the larger rollers for the purpose
of straddling the ribs and thus preventing endwise movement. Again, it is
obvious that the reversely turned ends of the sleeve may in the cylindrical form
be made as a part of the box or casing or they may be made in separate pieces.
While our invention is designed primarily for vehicles, it is capable of general
use as an axle or, journal bearing and we do not desire to restrict ourselves to

page_text: its use with vehicles. So, also, it is obvious that our invention may be applied to
cylindrical rollers and bearing surfaces.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is :-
1. A bearing comprising a sleeve fitting on the axle and movable longitudinally
thereon and having an annular rib or ribs, rollers around said sleeve provided with
a groove or grooves fitting over said rib or ribs, and a box fitting over said rollers,
and means for adjusting said sleeve whereby all of said rollers may be advanced
and retracted evenly and in operation are without friction on their ends, substan-
tially as and for the purpose set forth.
2. A bearing comprising a sleeve fitting on the axle and movable longitudinally
thereon and having annular ribs, rollers around said sleeve provided with grooves
fitting over said ribs, and a box fitting over said rollers, and means for adjusting
said sleeve whereby all of said rollers may be advanced and retracted evenly and
in operation are without friction on their ends, substantially as and for the purpose
set forth.
3. A bearing comprising a sleeve fitting on the axle and moving longitudinally
thereon and having an annular rib or ribs, rollers around said sleeve provided
with a groove or grooves fitting over said rib or ribs, and a box fitting over said
rollers, said axle having its end reduced and threaded and a nut on said threaded
end having an enlarged annular projection adapted to bear against said sleeve,
and thin washers intervening between said nut and the shoulder of said axle
whereby all of said rollers may be advanced and retracted evenly and in operation
are without friction on their ends, substantially as and for the purpose set forth.
4. A bearing comprising a bearing cone, conical rollers thereon and a conical
box fitting over said rollers, each of said rollers having a plurality of grooves,
and ribs on one of the bearing surfaces to co-operate therewith, substantially as
and for the purpose set forth.
5. A vehicle bearing comprising a conical shell fitting on the axle, conical
rollers on said shell and a conical box fixed to the hub of the wheel and bearing
on said rollers, said shell having a plurality of annular ribs and said rollers each
having a plurality of grooves to co-operate therewith, substantially as and for the
purpose set forth.
G. A vehicle bearing comprising two conical shells fitting on the axle and
tapering towards each other, conical rollers around said shells, and conical boxes
in the hub of the wheel and fitting around said rollers, each of said rollers having
a plurality of grooves therein and one of said bearing surfaces having ribs pro-
jecting into said grooves, substantially as and for the purpose set forth.
7. A vehicle bearing comprising two relatively adjustable conical shells fitting
on the axle and tapering towards each other, conical rollers around said shells,
and conical boxes in the hub of the wheel and fitting around said rollers, said
shells having one or more annular ribs and said rollers having grooves to receive
said ribs whereby all of said rollers may be advanced and retracted evenly and in
operation are free from friction on their ends, substantially as and for the purpose
set forth.
8. A vehicle bearing comprising two conical shells fitting on the axle and
tapering towards each other, conical rollers around said shells, and conical boxes
in the hub of the wheel and fitting around said rollers, said shells having a
plurality of annular ribs and said rollers having grooves adapted to receive said
ribs and means for adjusting said shells simultaneously, substantially as and for
the purpose set forth.
9. A vehicle bearing comprising two conical shells longitudinally movable on
the axle and tapering towards each other and each provided with an annular rib
or ribs, conical rollers around said shells each provided with a groove or grooves
to co-operate with said rib or ribs, and conical boxes fixed to the hub of the

page_text: wheel, said axle having a shoulder against which one of said shells abuts and
having a threaded end and a nut thereon, said nut being arranged to bear against
the other shell whereby when said nut is tightened, all of said rollers may be
advanced evenly and in operation are free from friction on their ends, substantially
as and for the purpose set forth.
10. A bearing comprising an inner bearing piece and an outer bearing piece
and rollers fitting between the bearing surfaces thereof, one of said pieces having
one or more annular ribs thereon and one of said pieces having reversely turned
parts at its ends constituting grooves at said ends, and said rollers having narrow
projections at their ends adapted to enter said grooves, substantially as and for
the purpose set forth.
11. A bearing comprising an inner bearing piece and an outer bearing piece and
rollers between the same, one of said pieces having reversely turned end portions
fixed thereon or integral therewith and constituting grooves, one of said end
portions being notched and said rollers having projecting end portions in said
grooves, substantially as and for the purpose set forth.
12. A bearing comprising a conical sleeve with a rib or ribs thereon and having
its ends enlarged and provided with grooves in their inner sides, conical rollers
bearing on said sleeve and having grooves corresponding with said ribs and having
narrow projections at their ends extending into said side grooves, substantially
as and for the purpose set forth.
13. A bearing comprising a conical sleeve having its ends enlarged and pro-
vided with annular grooves and a notch in the backturned portion thereof, and
conical rollers around said sleeve having projections at their ends within said
grooves, substantially as and for the purpose set forth.
14. A bearing comprising a conical sleeve having its ends enlarged and pro-
vided with annular grooves therein, conical rollers around said sleeve having
projections at their ends within said grooves, a box around said rollers, said sleeve
having raised annular surfaces, and smaller conical rollers arranged alternately
with the first-mentioned rollers and upon said raised annular surfaces and clear
of the main bearing surfaces of the box and sleeve, substantially as and for the
purpose set forth.
15. A bearing comprising a conical sleeve, a box and grooved conical rollers
between the same, said sleeve having an annular rib or ribs corresponding with
the grooves of the rollers and having grooves formed at its ends for projections
at the ends of said rollers, and having raised annular surfaces in said grooves,
and smaller conical rollers bearing on said raised surfaces and arranged alternately
with said first mentioned rollers and clear of the box and the main bearing sur-
face of the sleeve, substantially as and for the purpose set forth.
T
T
1 1000
Dated this 4th day of April 1800.
For the Applicants,
J. G. LORRAIN, M.I.E.E., M.I.Mech. E.,
Norfolk House, Norfolk Street, London, W.C.,
Chartered Patent Agent.