IMPROVEMENTS IN GYMNASTIC APPARATUS
Year: 1885

page_text: ALFRED WILLIAM TURNER Cobden Hotel Chambers Corporation Street
Birmingham Mechanical Engineer and Solicitor of Patents do hereby declare the
nature of my invention for IMPROVEMENTS IN GYMNASTIC APPARATUS to be as
follows:-
$44
This invention consists in the combination and arrangement of parts constituting
a complete self-levelling mechanical see-saw, suitable for the purposes of exercise
or amusement.
The placing of a plank across a tree on which to have a game at see-saw is a
well known juvenile amusement consequently I do not claim to be the inventor of
the game of see-saw, but of the particular combination and arrangement of the
various parts here-in-after set forth, whereby the game of see saw can be carried
on easily and safely.
33
A couple of school-boys in a country lane playing at see saw in the old fashioned
way, would be balanced by the lighter boy pulling the plank towards himself: If
the plank when so placed would stay and oscillate on the exact spot to which it
was removed all would go well with the riders, but the result in practise always
has been, that sooner or later the plank slips, and both riders are thrown o
off and
more or less damaged.
In carrying out my invention I sometimes use the plank in the old fashioned
flat position, but instead of resting it on a tree, or on half a dozen loose bricks
I provide a firm frame or pillar, forming a base, from which 'rises two cheeks, in
each of these cheeks I form a notch, or slot. I next fasten to the plank a plate
having a number of arms' on. each side, forming axial-pins, or I can take a number
of separate pieces of round iron, flatten them in the middle, and fasten them to
the plank, thus in either case forming a number of separate axial pins. I then
provide a connecting rod or frame, and form on it; or fix on it, a number of
separate axial pins in a similar manner to the method described for the plank,
only shorter in length.
On each cheek rising from the frame, or base I form a separate extra notch or
slot. I next provide a seat-bracket, one arm of it I connect to one end of the
plank, and one end of the connecting-rod; I then fix a similar bracket to the other
end of plank and connecting rod; thus fastening the plank and connecting rod

page_text: together by means of the seat-brackets. I then lift the connected parts, and lower
one axial pin of the connecting rod into the bottom notches or slots or bearings
provided in the cheeks to receive it: at the same time lowering one axial pin of
the plank into the top notches or slots provided to receive it; I then fix a suitable
seat on each of the brackets; the apparatus so put together could then be used;
one or more riders being mounted on each of the seats, could operate the plank or
beam on its axial pin, to produce the desired see-saw motion. The axial pin of the
plank or beam would prevent the plank from slipping; the axial pin of the
connecting rod would keep the seat at each end of connecting rod steady; while
each end of the beam or plank would draw the bracket connected to it, horizontal
so that whatever position the beam may be in; the seats would be level.
I prefer in some cases, to fix the plank edgeways, and in that case, it may be
made parallel; or it may be tapered like the beam of a beam-engine.
Two persons of different weights being about to use the machine would each take
one end of the plank, and its connections, and lift the axial pins out of their slot
bearings, and lower another pair of plank and connecting rod axial pins, into their
slot bearings; that is to say place more of the beam and connecting rod on one
side of the base, than on the other side, in a similar manner to the primitive
method by which the lighter boy pulls the plank towards him across the tree; as
here-in-before mentioned.
Instead of making a plate formed into a number of axial pins, and fixing it on
a plank; or providing a number of separate axial pins and fixing them separately
to a plank and connecting-rod; I can produce the same result by putting one axial
pin across the upright cheeks to connect with the beam and one axial pin under-
neath it to connect with the connecting rod. I can then provide a rack at the
central part of the beam or plank and a rack at the central part of the connecting
rod and place the racks to gear on to the axial pins; this method is similar in its
results to the before-mentioned slot and pin arrangement being merely inverted.
When using the rack arrangement, I make holes in the beam or plank, over the
rack, or under it, and form a crescent shaped slot in each side cheek, so that after
the beam or plank is placed in position on any tooth of the rack, a securing bolt
or linch-pin could be passed through the cheeks over the rack, to lock or secure the
beam or plank and prevent the rack moving off the axial-pin.
In some cases I can dispense with the rack or its equivalent and use one central
pivot or axial pin for the beam and one central pivot or axial pin for the connecting
rod, the difference in the weights of the riders can then be balanced by fixing a
-pin on the extreme end of each seat on which weights can be placed, or by forming
a box on the seat, or on the beam, or on the connecting rod, or forming the seat
into a box, and in either case putting weights into the box to balance the lighter
rider.
In some cases I can balance the riders on one axial pin of beam and one axial
pin of connecting rod; by forming each seat into a box, or by fixing a box near
each seat, either on the beam, or on the connecting rod, or on the bracket; and then
connecting the box or receptacle at one end of the beam or connecting rod, to the
box or receptacle at the other end of the beam or connecting rod, by means of a
tube, the tube being fixed over the beam, or on the sides, or under the beam, or on
any convenient part of the connecting rod: Liquid; sand; or metal (preferably
lead shots) can then be placed in the box, or receptacle at one end of the beam,
and discharged into the receptacle at the other end of beam, by simply placing the
beam at an angle, to allow the slots; liquid; or other substance to pass through
the tube: suitable cocks or stop valves being provided at each end, to secure the
substance at the end where it is required to balance the riders.
The connecting rod can be made to form the conduit for the balancing
substance.
In some cases I form the base frame, of metal spread out like the trunk of a
tree, it can be formed of sheet metal, or cast metal, or part wood, and part metal;
the said base being provided with a socket to receive a pin, formed on the cheek

page_text: part, the pin and socket being grooved to receive balls, to form a ball bearing, so
that the riders can revolve in a circle at the same time that they use the see-saw
motion instead of having the pin on the cheek part, it can be on the base, and
the socket formed in the part carrying the cheeks. The cheek part when provided
with a socket can be fixed on a post driven into the ground, or the cheek part can
have a short flanged base to grip a rail of wood, or other material, by that means
all the ordinary swing frames now used in gardens, can be utilised for the see-saw,
by fixing the loose rail on the swing frame and connecting the cheek part to it,
ready to receive the beam. To prevent the seats striking the ground I fix a
projection on the base frame or pillar, and form it to receive cork, india-rubber, or
other yielding substance. I then fix projections on the beam to engage with the
cork or other yielding substance, or I can fix feathers or projections on the central
axial pin of beam, or at, or near each end, and provide a steel spring, rubber-spring,
or a spring made of other suitable material, and fix it on, or near the cheeks, so
that the feathers on the axial pin, will come in contact with the springs: For
convenience of packing I can make the base in sections.
Instead of fixing boxes on the beam I can make the beam into a box, and utilise
the said box, for balancing the riders, by means of metal, sand, or liquid.

page_text: ALFRED WILLIAM TURNER Mechanical Engineer Cobden Hotel Chambers
Corporation Street Birmingham in the County of Warwick do hereby declare the
nature of my invention for IMPROVEMENTS IN GYMNASTIC APPARATUS and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
* This invention consists in the combination and arrangement of parts constituting
a complete self-levelling mechanical see-saw suitable for the purposes of exercise or
amusement.
The placing of a plank accross a tree on which to have a game at see-saw is a well
known juvenile amusement consequently I do not claims to be the inventor of the
game of see-saw but of the particular combination and arrangement of the various
parts herein after set forth whereby the game of see-saw can be carried on easily
and safely.
A couple of school boys in a country lane playing at see-saw in the old fashioned
way would be balanced by the lightest boy pulling the plank towards himself; if
the plank when so placed would stay and oscillate on the exact spot to which it
"was removed all would go well with the riders but the result in practise always
has been that sooner or later the plank slips and both riders are thrown off and
more or less damaged.
In carring out my invention I sometimes use the plank in the old fashioned flat
position but instead of resting it on a tree or on half a dozen loose bricks,
I provided a firm frame or pillar forming a base from which rises two cheeks in
each of these cheeks I form a notch or slot. I next fasten to the plank a plate
having a number of arms on each side forming axial pius or I can take a number of
separate pieces of round iron flatten them in the middle, and fasten them to the
plank, thus in either case forming a number of separate axial pins. I then provide
a connecting rod or frame, and form on it or fix on it a number of separate axial
pins in a similar manner to the method described above for the plank only shorter
in length.
On each cheek rising from the frame or base I form a separate extra notch or
slot. I next provide a seat-bracket, one end of it I connect to one end of the
plank, and one end of the connecting rod. I then fix a similar bracket to the other
end of the plank and connecting rod; then fastening the plank and connecting rod
together by means of the seat-brackets I lift the connected parts and lower one
axial pin of the connecting rod into the bottom notches or slots or bearings i
provided in the cheeks to receive it at the same time lowering one axial pin of the
plank into the top notches or slots provided to receive it. I then fix a suitable
seat on each of the brackets; the apparatus so put together could then be used;
one or more riders being mounted on each of the seats, could operate the plank or
beam on its axial-pin to produce the desired see-saw motion. The axial-pin of the
plank or beam would prevent the plank from slipping; the axial-pin of the
connecting-rod would keep the seat at each end of connecting-rod steady while
each end of the beam or plank will draw the bracket connected to it horizontal so
that whatever position the beam may be in the seat will be level.

page_text: I prefer in some cases to fix the plank edgeways and in that case it may be made
parellell or tapered like the beam of a beam-engine.
Two persons of different weight being about to use the machine would each take
one end of the plank and its connections and lift the axial-pins out of their slot
bearings and lower another pair of plank and connecting-rod axial-pins into their
slot bearings, that is to say place more of the beam and connecting-rod on one side
of the base than on the other side in a similar manner to the primitive method by
which the lighter boy pulls the plank towards him across the tree as herein before
mentioned, instead of making a plate formed into a number of separate pins and
fixing it on a plank, or providing a number of separate axial-pins and fixing them
separately to a plank and connecting-rod I could produce the same result by
putting one axial pin across the upright cheeks to connect with the beam and one
axial pin underneath it to connect with the connecting-rod. I can then provide a
rack at the central part of the beam or plank and a rack at the central part of the
connecting rod and place the rack to gear on to the axial pins, this method is
similar in its results to the before inentioned slot and pin arrangement being meroly
inverted.
When using the rack arrangement I make holes in the beam or plank over the
rack or under it and form a crescent shaped slot in each side cheek so that after
the beam or plank is placed in position on any tooth of the rack, a securing bolt or
linch pin could be passed through the cheeks over the rack to lock or secure the
beam or plank and prevent the rack moving off the axial pin.
In some cases I can dispense with the rack or its equivalent and use one central
pivot or axial-pin for the beam and one central pivot or axial-pin for the connecting-
rod, the difference in the weight of the riders can then be balanced by fixing a pin
on the extreme end of each seat on which weights can be placed, or by forming
a box on the seat or on the beam or on the connecting-rod or forming the seat into
a box and in either case putting weights into the box to balance the lightest rider.
In some cases I can balance the riders on one axial-pin of beam and one axial-pin
of connecting-rod by forming a box or by fixing a box near each seat either on the
beam or on the connecting-rod or on the bracket, and then connecting the box or
receptacle at one end of the beam or connecting-rod to the receptacle at the other
end of the beam or connecting-rod by means of a tube; the tube being fixed over
the beam or on the sides or under the beam or on any convenient part of the
connecting rod: Liquid; sand; or metal (preferably lead shots) can then be placed
in the box or receptacle at one end of the beam and discharged into the receptacle
at the other end of beam, by simply placing the beam at an angle to allow the
shots; liquid; or other substance to pass through the tube; suitable cocks or stop
valves being provided at each end to secure the substance at the end where it is
required to balance the riders.
The connecting rod can be made to form the conduit for the balancing
substance.
In some cases I form the base frame of metal spread out like the trunk of a tree,
it can be formed out of sheet metal or cast metal or part wood and part metal, the
said base being provided with a socket to receive a pin formed on the cheek part,
the pin and socket being grooved to receive balls to form a ball bearing, so that
the riders can revolve in a circle at the same time that they use the see-saw
motion. Instead of having the pin on the cheek-part it can be on the base and
the socket formed in the part carrying the cheeks. The cheek part when provided
with a socket can be fixed on a post driven into the ground, or the cheek-part can
have a short-flanged base to grip a rail of wood or other material, by that means
all the ordinary swing frame now used in gardens can be utilized for the see-saw
by fixing the loose rail on the swing frame and connecting the cheek part to it,
ready to receive the beam. To prevent the seat striking the ground I fix a
projection on the base-frame or pillar and form it to receive cork, india rubber or
other yielding substance I then fix projections on the beam to engage with the cork

page_text: In making my base in an inexpensive manner, I form a piece of sheet metal
somewhat in the shape of an inverted-shilling-galvanized-iron-bucket; wired as
indicated at a figures 1 and 3; In some cases I prefer to put the apex rim-wire
outside, as shown at b figure 5 I then provide a metal casting c figure 1, to pass inside
the sheet metal frame, or I can turn a piece of wood to the configuration indicated,
and in either case secure the casting, or wood to the sheet-iron, by means of
suitable bolts, as indicated at d figure 1; In other cases I make a flat joint at e
figure 1 and provide merely a top portion in metal; in such cases, the top metal
portion, will be provided with the ball bearing or groove.
When adopting the inside rim wires as shown at
pass over as indicated at f figure 5:
figure 5, I use a casting, to
I next provide a casting an enlarged representation of which is shown in section
at figure 10, and in side elevation at figure 11; the socket g passing over the pin f
figure 5 or over e figure 1 so as to bring the anular groove h over the sphericall
balls; thus enabling the side-frame casting figure 10 to revolve easily on the
balls j, round the pin e or f. I next provide a plank k of suitable dimentions and
fasten it to the axial-plate 7 (illustrated at figure 4), by means of the screw m. I
next provide a suitable plank, to form the connecting rod n, it will be observed.
that the plate o is similar to the plate excepting that it is less in width; I next
provide two seat-brackets p, one for each end of the beam I secure the bearings q
and to the end of the plank by passing suitable axial pins through the holes at;
after fixing a similar bracket p to the other ends of plank and connecting rod, I
prepare to lift the connected parts and in order to move the projecting arms
of plates and n in a proper position so that both pairs of arms will enter
their slot bearings uv at the same time, I provide a linch pin w and pass it
through a hole provided in the; seat-bracket bearing, thus locking each seat-
bracket rigidly.
I then lift the connected parts and lower the two ends ys of one axial pin of
the connecting rod into the bottom notches or slots or bearings v. v+, at the same
time lowering the two ends a¹ b¹ of one axial pin of the plank into the top notches
or slots u ut.
I then fix a suitable seat c¹ on each of the seat brackets.
The apparatus so put together would be ready for use.
One or more riders being mounted on each of the seats c¹ could operate the plank
or beam k on its axial pin to produce the desired see saw motion: The axial pin
oscillating in the top slots u u+, would prevent the plank from sliping: the axial
pin of the connecting rod oscillating in the bottom slots and v+ would keep the
seats at each end of the connecting rod steady, while each end of the beam or plank
would draw the bracket connected to it horizontal, so that whatever position the
beam or plank may be in, the seat would be level.
To prevent the axial pins from rising or jolting out of their slot bearings I pro-
vide a sliding top bearing marked d¹ figures 10 and 12 and represented in section
at figure 13: each side cheek would be provided with an opening as represented
at et figures 14 & 15.
The apparatus having been placed to oscillate in the top and bottom bearings, the
top bearing would be slidden over the axial pins as represented at figure 10:
the top bearings could be drawn back to the position shown at figure 12.
Instead of using the axial plate figure 2 I can provide seperate axial pins shaped
as represented at figure 6 and secure a number of these seperate axial pins to the
plank forming the beam and also secure a corresponding number to the plank
forming the connecting rod, placing the flattened side f¹ against the plank.
When using the plank or beam edgeways in conjunction with an axial pin plate,
or seperate axial pins: I can drive seperate, round metal, or wood pins, through
the beam or plank, as indicated at g¹ figure 24, or I can use axial pin plates in the
manner indicated at figures 23 and 25,

page_text: A beam and connecting rod so prepared could be used in a frame similar to
figure 10 excepting that the space from cheek to cheek would be suitably
narrowed.
Instead of using the arrangement described in relation to figures 1. 2. 4. 5. 6. 19.
11. 12. 13. 14. 15. 23. 24 and 25 I can produce the same result, by putting one pin
accross the upright cheeks to connect with the beam as indicated at g¹ figures 19
and 21 and one pin underneath to connect with the connecting rod.
I provide a rack h' at the central part of the beam or plank and a rack at the
central part of the connecting rod; and place the racks to gear on the axial pins as
illustrated at figure 21; this method is similar in its results to the slot and axial
pin arrangement shown at figures 10 and 11, being merely inverted; the holes k
are for the purpose of receiving the securing bolt 1, by means of which the rack h
is kept in contact with the axial pin gl and prevented from rising or jolting off:
the connecting-rod m¹ is by preference made of metal rod; the seat-bracket n¹ is
exactly similar to the bracket p figure 11: the external line o figure 21 represents
the thickness of the shell of the rack-box, the box when used for large heavy
machines is passed through the timber or other material forming the beam, and in
a like manner passed through the timber or other material forming the centre part
of the connecting rod.
In some cases I make the metal rack box constitute the central part of the con-
necting rod and connect it to rods similar to m¹ figure 21; I can thus cast two
rack boxes; utilize one to form the centre of the connecting rod and use the other
to secure to the contre of the beam.
Two persons being about to use the machine as illustrated at figures 10 and 11
would each take one end of the plank and its connections and lift the axial
pins a¹ by out of their slot bearings uu+: v, v + and lower another pair of
plank and connecting rod axial pins into the said slot bearings u, u+: v, v+ and
thereby place more of the beam and connecting rod on one side of base than on the
other side: Two persons being about to use the machine as illustrated at figure 21
would in a like manner lift the racks h¹, of the centre axial pins g', and lower
some other part of each rack over each axial pin.
It will be observed that the weight of the side bracket portion of the base does
not rest and revolve on the faces, but on the spherical balls which rotate in the
anular groove as indicated at figure 20.
In some cases I dispense with the rack or its equivalent slots and pins, and use
the central axial pins similar to g¹: secured to or working in the centre of beam
and the centre of connecting rod as indicated at figure 30; the difference in the
weight of the riders can then be balanced by fixing a pin on the extreme end of
each seat bracket on which to place weights as shown at figure 21 or by forming a
box on the seat or on the beam, or on the connecting rod or by forming the seat
into a box as indicated at figure 21 and in either case putting weights or substance
into the box to balance the lightest rider.
The machine can be put on the market in the form represented at figure 21, the
purchaser can use the rack; the box; or the weights.
The machine could be built to ossilate in the manner illustrated at figure 30 and
be balanced by weights as hereinbefore described.
In some cases I can balance the riders on one axial pin of beam and on one axial
pin of connecting rod by forming a box or by fixing a box near each seat, either
on the beam as indicated, at or on the connecting rod, or on the seat bracket, and
then connecting the box or receptacle at one end of the beam or connecting rod to
the receptacle at the other end by means of a tube, the tube being fixed over the
beam as indicated at o³, or on the sides, or under the beam, or on any convenient
part of the connecting rod; liquid; sand, or metal (preferably lead shots) being
placed in the box at one end of the beam can be discharged through the tube
into the box at the other end of the beam and retained there by means of the
sliding cut off valve The connecting rod can be made to form the conduit for the
·

page_text: balancing substance as indicated at p² and as shown in section at figure 29 the
bent pipe q' is formed of elastic material to allow of the alteration of position as
indicated in dotted lines.
The cocks
substance.
are for the purpose of discharging or retaining the balancing
Figure 7 represents a post, prepared ready to drive into the earth; the top part
is rounded and fits into the socket bottom of side-bracket frame prepared to fit it,
as illustrated at figures 26 and 27.
The cheek part (or side bracket frame) is sometimes formed with a short flanged
base to grip a rail of wood or other material as represented at figures 8, 9, 18, the
rail at each side of any ordinary swing-frame can be adjusted to any suitable height
by means of the adjusting pins.
Figure 32 represents in detail an enlarged side elevation similar to figure 30,
indicating more clearly the projection formed on each side of each cheek, leaving
a recess or pocket in which is placed the yielding substance. Figure 33 represents
a front view of fig. 32 with the beam removed and Figure 34 represents the beam
in section, to which is secured the projections for engaging with the yielding
substance.
Figures 16 and 17 represent the feather and spring, check action; the axial pin
(corresponding with g¹ figures 19 and 21 and 8' figure 28) is formed square a
sufficient distance to pass through the beam; metal plates t¹ are fixed on one or
both sides of the beam by means of suitable pins; the axial pin is formed round
at w' to work in the cheek bearings; near each end of the axial pin is provided
a slot v' through which is passed the feather w₁ A spring al is provided resting
on the projecting ledge; in some cases I secure the spindle to the beam or plank
either with or without the plates by means of a nut on each side the beam, threaded
on to the spindle and screwed tightly against the plate or against the side of the
plank or beam, or in case of using a metal beam, I can tap the hole in the beam
and screw the fulcrum or axial pin into the hole so threaded: When the beam and
seats are horizontal the feather on each side the beam would come in contact with
the spring as indicated in dotted lines. In order to protect the spring and feather
from the fingers of children using the machine, I provide the cover shewn in
section at fig. 17 and broken at figure 16. Instead of fixing boxes on the beam
I sometimes form the beam into a box as shewn in section at figures 35 and 36;
the beam so made can be utilized for balancing the riders, the slide would retain
the balancing substance at the end where it was required to balance the lightest
rider.
I am aware that four or more applications have heen made to the English
Patent office in connection with improvements in see saws, the blue books of which
are on view at the Government Patent Office Library; The see saw riding machines
described in the said blue books are each different from the other: they are all
more or less imperfect some of the machines if made in the manner described will
not work; wile others if made in the manner set forth in the specification are so
costly as to be unsaleable.
The invention set forth in this specification utilizes the plank and beam in an
entirely different manner to that of any other previous specification and obtains
the desired result by a less expensive arrangement of parts and it is for the
particular arrangement of parts as herein set forth constituting a complete Self
Levelling Mechanical See Saw machine that I now claim protection.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
1st. The making of a self levelling, mechanical see saw machine, by the com-
bination of either the base part shown at figure 1, or the base part shown at
figure 5 or the base part shown at figure 20; in conjunction with the side-bracket-

page_text: frame the beam, the connecting rod, the seat bracket and the seat, illustrated at
figures 10 and 11: the beam and connecting rod oscillating on axial pins, so as to
enable the riders using the machine, to oscillate the beam, and at the same time
move in a circular manner round the base; as illustrated and described.
2nd. The making of a self-leveling, mechanical see saw machine, by the com-
bination of either the base part shown at figure 1, or the base part shown at
figure 5, or the base part shown at figure 20; in conjunction with the side bracket
frame similar to figure 10 (narrowed), a beam and connecting rod similar to that
shown at figure 23, seat brackets and seats, the beam and connecting rod oscillating
on axial pins, so that the riders using the machine, can oscillate the beam, and at
the same time move in a circular direction round the base; as illustrated and
described.
3rd. The making of a self levelling, mechanical see saw machine, by the com-
bination of either the base part shown at figure 1, or the base part shown at
figure 5 or the base part shown at figure 20 in conjunction with the side bracket
frame, beam, connecting rod, seat brackets and other attachments shown at
figures 19 and 20, the beam and connecting rod being each provided with a rack
so that in order to balance the diference in the weight of the riders, each rack can
be moved to bear on its fulcrum pin at any desired part of the rack, as illustrated
and described.
4th. The making of a self levelling mechanical see saw machine, by the com-
bination of either the base part shown at figure 1, or the base part shown at
figure 5 or the base part shown at figure 20 in conjunction with the side bracket
frame, beam connecting rod, seat brackets, seats, shot boxes, conduit tubes, valves,
cocks, and other attachments shown at figures 28, 29, 30 and 31 the beam and
connecting rod each oscillating on an axial pin, the difference in the weight of the
riders being balanced by passing liquid, sand, metal or other balancing material
(preferably lead shots) to the lightest end, in the manner illustrated and described.
5. The combination of the loose bars and front plate or receiving brackets shown
(cut off) at figure 18 in conjunction with either of the beams connecting rods and
attachments show at figures 11, 20, 23 or 30 forming a complete self levelling
mechanical see saw machine (without rotating motion) sutable for attaching to
any ordinary swing frame at any desired height from the ground as illustrated
and described.
6th. In a self levelling mechanical see saw machine, a hollow beam, through
which to convey a suitable balancing substance which can be secured at will, at
either end of the beam, to balance the lighter rider as illustrated and described in
reference to figures 35, 36 and 37.
7th. In a self levelling mechanical see saw machine, the utilization of a balancing
substance conveyed from a box formed or fixed on, or at, or near each seat either
on the beam, or on the connecting rod, or on the seat bracket the balancing substance
being liquid; sand; or metal, preferably lead shots; the balancing substance being
conveyed through a tube or tubes from the box at one end of the beam or
connecting rod to the box at the other end of the beam or connecting rod as.
illustrated and described.
8th. In a self levelling mechanical see saw machine, the check-action arrange-
ment as illustrated and described in reference to figures 32, 33 and 34.
9th. In a self levelling mechanical see saw machine, the check action arrangement
as illustrated and described in reference to figures 16 and 17.
10th. In a self levelling mechanical see saw machine the utilization of sphericall
balls to form, and forming, a ball bearing as indicated in my provisional specification,
the balls rotating in a groove, which may be formed in the manner indicated at
figures 20. 21 and 30 or which may be formed in any other convenient way in
accordance with the wording of the provisional specification.
11th. In a self levelling mechanical see saw the utilization of the sliding top
bearing as indicated at figures 10, 12, 13, 14 and 15.

page_text: 12th. In a self levelling mechanical see saw machine a side bracket frame formed
with a socket to fit on a post as illustrated at figures 7, 26, and 27.
13. In a self levelling mechanical see saw machine the utilization of weights
fixed or placed in a box formed on the seat, or on the beam, or on the connecting
rod, or in the seat; a sutable number of weights being placed in the box as occation
requires, to balance the lightest rider.
14. In a self levelling mechanical see saw machine the utilization of the
connecting rod to form a conduit for the balancing substance as illustrated and
described.