IMPROVEMENTS IN PLOUGHS AND IN ATTACHING ROTATING FORKS OR PULVERIZERS TO PLOUGHS
Year: 1873

page_text: LETTERS PATENT to Samuel Corbett, of Wellington, in the County
of Salop, Agricultural Implement Manufacturer, for the Invention
of "IMPROVEMENTS IN PLOUGHS AND IN ATTACHING ROTATING FORKS OR
PULVERIZERS TO PLOUGHS."
Scaled the 17th June 1873, and dated the 14th March 1873.
PROVISIONAL SPECIFICATION left by the said Samuel Corbett at
the Office of the Commissioners of Patents, with his Petition, on
the 14th March 1873.
I, SAMUEL CORBETT, of Wellington, in the County of Salop, Agricul-
tural Implement Manufacturer, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN PLOUGHS AND IN ATTACHING ROTATING FORKS
OR PULVERIZERS TO PLOUGHS," to be as follows:-
My said Invention consists principally of improvements in the ploughs
described in the Specifications of Letters Patent granted to me and
dated respectively, the 29th day of June 1871, No. 1699, the 9th day
of March 1872, No. 731, and the 14th day of October 1872, No. 3022.
My present Invention consists, first, of improvements in ploughs for
ploughing two or more furrows at a time. In order to regulate the

page_text: width of the furrow made by the said ploughs I fix a plough body on
a separate beam, so that I can attach any number of plough bodies to
the same guide wheels and handles. On the front part of the first beam
I fix the wheels to regulate the width and depth of the first plough and
the "fore end" to attach the horses to. On the other or rear end of the
beam I form a box or hole and in or near the middle of the beam on the
unploughed land side I fix a transverse bar projecting from the side of
the beam. At the fore end of the second beam I fix a box to slide on
the projecting bar of the first beam, and at a distance to correspond with
the box of the first beam I fix a transverse bar on the ploughed land 1
side to go through the box of the first beam. I fix the beams in their
places by strong set screws or other fastenings which will allow the beams
to be fixed at any required distance apart, and set the plough to and
from the land.
If the plough is required to plough but two furrows the plough 1
handles are fixed at the end of the second beam, but if the plough is
required to plough more than two furrows I make a box on the hind end
of the second beam, and a transverse bar in or near the middle of the
beam on the unploughed land side to fix the beam and handles to the
third plough, and in like manner to any number of ploughs.
The middle plough beam can be removed in a short time and the
plough made into a two furrow plough, or the second body can be as
rapidly taken off and the plough made into a single plough.
2
When used as a three furrow plough I fix a wheel or slade behind
the second body to lift it for turning at the ends. By this arrangement 2
any required number of ploughs can be readily put to work at any
width of furrow to suit the land and season.
By removing the plough body from each beam and fixing a number of
grubber or cultivator tines in its place, the plough is converted into a
two or three horse cultivator or grubber, and with this implement the
ground can be very effectually broken up and worked to a fine tilth.
3
My Invention consists, secondly, in an improved construction or
arrangement of the parts for and in the mode of fixing breasts on mould-
boards, to ridge ploughs, or potato raising ploughs, or ploughs fitted with
right and left hand mould boards. I cast a groove rather more than half- 3
round in figure along the back of the front part of the frame, and I cast
a round pin or centre piece down the inside of the front or throat of the

page_text: mould board, which latter I slide into the half-round groove in the frame.
By this means the mould boards are held fast in their position and allowed
to open or close at will. They require no drilling or fitting and can be
readily removed and replaced.
My Invention consists, thirdly, in constructing mould boards of ridge
ploughs and potato raising ploughs, and single and double ploughs with
fastenings to fix a rotating fork at the top and rear end of the mould
board, so that the fork can be moved narrower or wider with the mould
board, and leave the hind part of the plough more open. I cast or fix
at the upper part of the rear end of the mould board a disk having
radial surface teeth or projections on it, and I cast like teeth on the part
which carries the revolving fork arm, the teeth on the latter fitting into
the teeth on the part cast on the mould board. On the other side or
back of the part carrying the revolving fork I cast a groove to carry
the arm of the revolving fork, and by passing the arm through a
screwed loop, and the stem of the loop through the loose piece and the
disk on the mould board, and thus fixing the teeth or projections in
each other the fork can be set and locked firmly together in any position,
only one screw nut having to be removed to fix, alter, or remove the
rotatory fork.
My Invention consists, fourthly, in the following method of con-
structing breasts or mould boards for potato raising ploughs. I make the
front part of the mould board, carrying the hinge, only a few inches
wide about half way up the said mould board, and I extend the top part
of the mould board to a distance sufficiently long to carry the revolving
forks. I fix a bar or bars of wrought iron or steel to the bottom part
of the mould board for the purpose of allowing the fine soil to fall
through and leave the rubbish loose on the top of the land for the
revolving fork to lift and lighten it up. These bars can readily be taken
out for repair. I also make one wing on each side of the share to go
along each side of the plough for the purpose of loosening up the bottom
of the ridge so that the potatoes can be easily brought to the surface
without injuring them.
My Invention consists, lastly, of the following improved mode of
fixing and locking revolving forks or pulverizers behind the mould
boards of ploughs by which the moving of the fork or pulverizers, when
at work on strong land or in turning at the ends of furrows, is prevented.

page_text: I fix on the bar which passes across the plough tails a box or disk,
having on its front surface radial teeth or projections. A corresponding
box or disk having similar teeth and fitting upon the former has on its
outside a groove to carry the arm of the rotating fork or pulverizer. By
putting the said arm through a screwed loop, and the screw of the loop
through the centre of the two castings described, which have holes for
the purpose, and screwing up the loop the revolving forks or pulverizers
are firmly locked in their position with only one screw.
SPECIFICATION in pursuance of the conditions of the Letters Patent
filed by the said Samuel Corbett in the Great Scal Patent Office
on the 10th September 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, SAMUEL
CORBETT, of Wellington, in the County of Salop, Agricultural Imple-
ment Manufacturer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters:
Patent, bearing date the Fourteenth day of March, in the year of our Lord
One thousand eight hundred and seventy-three, in the thirty-sixth year
of Her reign, did, for Herself, Her heirs and successors, give and grant
unto me, the said Samuel Corbett, Her special license that I, the said
Samuel Corbett, my executors, administrators, and assigns, or such
others as I, the said Samuel Corbett, my executors, administrators, and
assigns, should at any time agree with, and no others, from time to time
and at all times thereafter during the term therein expressed, should
and lawfully might make, use, exercise, and vend, within the United
Kingdom of Great Britain and Ireland, the Channel Islands, and Isle of
Man, an Invention for "IMPROVEMENTS IN PLOUGHS AND IN ATTACHING ROTATING
FORKS OR PULVERIZERS TO PLOUGHS," upon the condition (amongst others) that
I, the said Samuel Corbett, my executor's or administrators, by an instru-
ment in writing under my, or their, or one of their hands and seals, should
particularly describe and ascertain the nature of the said Invention, and
in what manner the same was to be performed, and cause the same to
be filed in the Great Seal Patent Office within six calendar months
next and immediately after the date of the said Letters Patent.

page_text: NOW KNOW YE, that I, the said Samuel Corbett, do hereby declare
the nature of the said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by
the following statement thereof, that is to say:-
My said Invention consists principally of improvements in the ploughs
described in the Specifications of Letters Patent granted to me and dated
respectively the 29th day of June 1871, No. 1699, the 9th day of March
1872, No. 731, and the 14th day of October 1872, No. 3022.
My present Invention consists first, of improvements in ploughs for
ploughing two or more furrows at a time. In order to regulate the
width of the furrow made by the said ploughs I fix a plough body on a
separate beam, so that I can attach any number of plough bodies to the
same guide wheels and handles. On the front part of the first beam I
fix the wheels to regulate the width and depth of the first plough and
the "fore end" to attach the horses to. On the other or rear end of the
beam I form a box or hole, and in or near the middle of the beam on the
unploughed land side I fix a transverse bar projecting from the side of
the beam. At the fore end of the second beam I fix a box to slide on
the projecting bar of the first beam, and at a distance to correspond with
the box of the first beam I fix a transverse bar on the ploughed land
side to go through the box of the first beam. I fix the beams in their
places by strong set screws or other fastenings, which will allow the
beams to be fixed at any required distance apart and set the plough to
and from the land.
If the plough is required to plough but two furrows the plough
handles are fixed at the end of the second beam, but if the plough is
required to plough more than two furrows I make a box on the hind
end of the second beam and a transverse bar in or near the middle of
the beam on the unploughed land side to fix the beam and handles to the
third plough, and in like manner to any number of ploughs.
The middle plough beam can be removed in a short time and the
plough made into a two furrow plough, or the second plough body
can be as rapidly taken off and the plough made into a single plough.
When used as a three furrow plough, I fix a wheel or slade behind the
second body to lift it for turning at the ends. By this arrangement any
required number of ploughs can be readily put to work at any width of
furrow to suit the land and season.

page_text: By removing the plough body from each beam and fixing a number of
grubber or cultivator tines in its place the plough is converted into a two
or three horse cultivator or grubber, and with this implement the ground
can be very effectually broken up and worked to a fine tilth.
My Invention consists, secondly, in an improved construction or
arrangement of the parts for and in the mode of fixing breasts or mould
boards to ridge ploughs or potato raising ploughs, or ploughs fitted with
right and left hand mould boards, and to other ploughs. I cast a groove
rather more than half round in figure along the back of the front part
of the frame, and I cast a round pin or centre piece down the inside of
the front or throat of the mould board, which latter I slide into the half
round groove in the frame. By this means the mould boards are held
fast in their position and allowed to open or close at will. They require
no drilling or fitting, and can be readily removed and replaced.
My Invention consists, thirdly, in constructing mould boards of ridge
ploughs and potato raising ploughs, and single and other ploughs, with
fastenings to fix a rotating fork at the top and rear end of the mould
board, so that the fork can be moved narrower or wider with the mould
board and leave the hind part of the plough more open. I cast or fix at
the upper part of the rear end of the mould board a disc having radial
surface teeth or projections on it, and I cast like teeth on the part which
carries the revolving fork arm, the teeth on the latter fitting into the
teeth on the part cast on the mould board. On the other side or back of
the part carrying the revolving fork I cast a groove to carry the arm of
the revolving fork, and by passing the arm through a screwed loop, and
the stem of the loop through the loose piece and the disc on the mould
board, and thus fixing the teeth or projections in each other the fork can
be set and locked firmly together in any position, only one screw nut
having to be removed to fix, alter, or remove the rotatory fork.
My Invention consists, fourthly, in the following method of construct-
ing breasts or mould boards for potato raising and other ploughs. I make
the front part of the mould board carrying the hinge only a few inches
wide about half way up the said mould board, and I extend the top part
of the mould board to a distance sufficiently long to carry the revolving
forks. I fix a bar or bars of wrought iron or steel to the bottom part of {
the mould board for the purpose of allowing the fine soil to fall through
and leave the rubbish loose on the top of the land for the revolving fork

page_text: to lift and lighten it up. These bars can readily be taken out for repair.
I also make one wing on each side of the share to go along each side of
the plough for the purpose of loosening up the bottom of the ridge, so
that the potatoes can be easily brought to the surface without injuring
them.
My Invention consists, lastly, of the following improved mode of fixing
and locking revolving forks or pulverizers behind the mould boards of
ploughs, by which the moving of the fork or pulverizer when at work on
strong land or in turning at the ends of furrows is prevented. I fix on
the bar which passes across the plough tails a box or disc having on its
front surface radial teeth or projections. A corresponding box or disc,
having similar teeth, and fitting upon the former, has on its outside a
groove to carry the arm of the rotating fork or pulverizer. By putting
the said arm through a screwed loop and the screw of the loop through
the centre of the two castings described, which have holes for the
purpose, and screwing up the loop, the revolving forks or pulverizers are
firmly locked in their position with only one screw.
Having explained the nature of my Invention I will proceed to
describe with reference to the accompanying Drawings the manner in
which the same is to be performed.
Figure 1 represents in plan a double furrow plough, the parts of
which are constructed and arranged according to my Invention; and
Figures 2 and 3 represent parts of the same. at is the beam of the
first plough, and 6 is the beam of the second plough. The beam a is
represented detached in Figure 3, and the beam 6 is represented detached
in Figure 2. c, d, are the plough bodies fixed by the screws and nuts
at d to the respective beams a, b. The front of the beam a carries the
axis of the adjustable wheels e, e, by which the width and depth of the
first plough is regulated; and to the said beam a the fore end fis also
connected, to which the horses are attached. To the back end of the
second beam 6 the plough handles 9, 9, are attached. At the middle of
the first beam a a transverse bar h is fixed, and at the rear end of the
said beam a a box or hole i is made. Near the rear end of the second
beam 6 a transverse bar k is fixed, which bar k takes into and passes
through the box i on the beam a; and at the front end of the beam b
is a box, which takes on to the cross bar h of the beam a (see Figure 1).
By the sliding of the cross bars h, k, of the beams a and b in the
.
.

page_text: boxes i, l, situated respectively opposite the said bars the said beams a, b,
may be adjusted at any required distance apart. The boxes i, l, are
fixed on the cross bars h, k, by the set screws m, m, and the two
beams a, b, are adjusted and fixed securely together by the strong screw
pin or screw stay n and lock nuts p, p.
In order to convert the double furrow plough, Figure 1, into a single
plough it is only necessary to remove the plough body d from the
beam 6 and slide the beams a, b, on the cross bars h, k, so as to bring
the said beams nearly in contact, and afterwards fix them together by
the screw or stay n and lock nuts p, p.
In order to convert the double furrow plough, Figure 1, into a three
furrow plough an additional beam with its plough body is placed and
fixed between the beams a, b, as illustrated in plan in Figure 4, the
additional or middle beam being represented detached in Figure 5. The
said additional or middle beam is marked q, and the plough body q³.
The said beam q has boxes r, s, at its ends and cross bars t, u, at about
its middle. In placing. the three beams a, q, and 6 together the box i
on the rear end of the beam a is passed on to the cross bart of the
middle beam q, and the box s on the front end of the middle beam q is
passed on to the cross bar h of the said beam a. Similarly the box / on
the beam 6 is passed on to the cross bar u of the middle beam q, and the
cross bar k of the said beam 6 is passed into the box on the middle
beam q. After the distance apart of the three beams a, q, b, has been
adjusted they are securely fixed together by the two screw pins or stays n
and and lock nuts p, p. A wheel or slade may be applied to the 1
middle beam q behind the plough body q³ to lift the said beam when
turning the plough at the headlands.
By constructing and arranging the parts of ploughs in the manner
described and illustrated any number of ploughs can readily be com-
bined together with any required width of furrow, the same guide
wheels and handles being used for a single plough or for a compound
plough.
To convert the ploughs, Figures 1 and 4, into a two or three horse
cultivator or grubber the plough bodies are removed from the beams,
and grubber or cultivator tines are fixed in their places.
My improvements in constructing and fixing breasts or mould boards
to ridge or potato raising ploughs, or ploughs fitted with right and left

page_text: handed mould boards, or ploughs with single mould boards, are illustrated
in Figures 6, 7, 8, 9, 10, and 11 of the Drawings.
Figure 6 represents a ridge or potato raising plough in side elevation;
Figure 7 is a plan of the same; Figure 8 is a side elevation of the frame,
to which the mould boards are connected; Figure 9 is an inside elevation
of one of the mould boards; Figure 10 is a horizontal section of a portion
of the two mould boards of the plough connected to the frame on the
beam; and Figure 11 is a horizontal section of the said frame taken on
the line x, Figure 8. The same letters of reference indicate the same
parts in Figures 6 to 11, both inclusive.
a, a, are the right and left-handed breasts or mould boards of the
plough, and is the frame carrying the said mould boards, the said frame
being bolted at 2 to the beam c of the plough. On opposite sides of
the frame b and near the front thereof a groove d is made, the said
grooves being rather more than half round in figure (see the sections
Figures 10 and 11), and on the inner side of each of the mould boards a
and near the front thereof a cylindrical pin or centre piece e is cast or
made, the said pins or centre pieces being of a size proper to fit tightly
in the grooves d, d, of the frame b. The mould boards a, a, are secured
to the frame by sliding the pins or centre pieces e, e, into the grooves
d, d, in the said frame b in the manner illustrated in Figure 10. By
this means the mould boards a, a, are capable of ready.connection to
and removal from the frame b, and when connected to the frame are
capable of a limited motion for opening or closing. The mould boards
a, a, are provided with the usual stay bars, by which their inclination to
the frame b is adjusted and fixed. The stay bars are omitted in Figure 7
in order the more clearly to indicate other parts. The holes in the
frame to which the stay bars are secured are marked 63 in Figure 8.
The upper parts marked a², a², of the mould boards are prolonged beyond
the parts a, a, carrying the hinge or connecting pieces e, e, the said
prolonged parts a³, a³, being sufficiently long to support the revolving
forks ff, at the required positions behind the acting parts a, a, of the
mould boards. The said prolonged parts a², a², carrying the revolving
forks ff, are inclined to the beam c at the angle represented in Figure 7.
To the bottom part of each of the mould boards a, a, parallel bars of
wrought iron or steel g, g, are fixed. When the plough is at work the
fine soil falls through the openings between the bars 9, 9, while the
rubbish is left loose on the top of the land for the revolving forks f, ƒ,

page_text: to lift it and lighten it up. Instead of horizontal bars 9, 9, bars inclining
downwards may be employed. In this case I prefer to attach the nearly
vertical bars to the prolonged part a² of the mould board to the edge of
which they stand at or near right angles. Or instead of separate bars a
series of long teeth or prongs may be formed by casting on the lower
edge of the part a² of the mould board. On each side of the share or
foot h of the plough a wing ² is made for loosening up the soil at the
bottom of the ridge so that the potatoes can be easily brought to the
surface without injuring them. I have not represented a single plough
having the mould board and frame constructed and connected according
to my Invention, as I believe the same will be sufficiently understood by
the description herein-before given of a plough with a double mould
board. I remark however that the front of the frame and mould board
of a single mould board plough will have in section the figure of one-
.half of Figure 10 and the front of the frame one-half of Figure 11.
My improvements in fastenings for fixing rotating forks at the top
and rear end of the mould boards of ridge ploughs and other ploughs are
illustrated in Figures 6, 7, and 9, and on a larger scale in Figures 12, 13,
14, 15, and 16 of the accompanying Drawings. To the upper part of
the prolonged rear end a³ of each mould board a, and on its inner side,
a disc i is cast or fixed, the said disc having radial surface teeth or pro-
jections on it. This disc is represented in connection with the prolonged
end a² of the mould board in elevation and section in Figure 14. On the
back face of the socket piece k, which receives the screwed loop of the
revolving fork f, similar radial surface teeth or projections k² are cast, a
the said teeth ³ being capable of fitting into and being locked with the
teeth on the disc i. The socket piece k (which may have any desired
figure) is represented separately in Figure 15, and the said socket piece k
and disc i engaged or locked together are represented in elevation in
Figure 12, and horizontal section in Figure 13. On the back of the
socket piece k a groove is made (see Figure 15) for receiving the
arm of the revolving fork f. The arm f³ of the fork is passed into
the loop (shown separately in Figure 16), and the said loop is placed
in the socket piece k, the screwed stem of the loop passing through holes
in the socket piece k and disc i on the mould board, and being fixed by a
screw nut m, screwed on the stem of the loop. In fixing the revolving
fork to the mould board a³ by means of the mechanism described and
represented, the stem or arm ƒ³ of the said fork having been passed into

page_text: the screwed loop 7, the latter is placed in the socket piece k, the arm f
of the fork passing into the groove in the said socket piece. The
screwed stem of the loop projecting from the back of the socket piece k
is now passed through the hole in the disc i on the mould board, and the
radial teeth k² on the back of the said socket piece engaged at the required
position with the teeth on the disc i. By next screwing home the screw
nut m on the screwed stem of the loop 1, the said loop and the socket
piece k are drawn inwards, and the teeth of the latter locked firmly with
those of the disc i; at the same time the stem f* of the revolving fork is
pressed so tightly in its groove k³ that its position and the inclination of
the said fork is firmly fixed. The revolving fork f is thereby firmly
secured to and adjusted on the mould board by the use of one screw nut.
By loosening the socket piece k by unscrewing the nut m, the said socket
piece may be turned upon the disc i, and rclocked to the said disc in any
required position for adjusting the fork, so as to make it incline more or
less to the beam of the plough, and thereby increase or diminish the
space at the tail of the plough.
The mechanism described and represented for attaching the rotating
fork to the mould board is applicable to the attaching of rotating forks or
pulverizers to ploughs having single as well as to those having double
mould boards, and to ploughs in general.
In applying this part of my Invention to the fixing and locking of
rotating forks or pulverizers behind the mould boards of ploughs I
construct and arrange the parts in the manner illustrated in Figures 17
and 18 of the Drawings, Figure 17 representing in plan a portion of the
bar fixed across the tails of a plough with my improved fastening.
mechanism applied thereto, and Figure 18 representing in elevation a
portion of the same. On the end of the forked bar n, which passes
across the plough tails, and is fixed in the ordinary way, a box or disc p
is secured by forcing the end of the said bar into the taper eye p³ of the
said box or disc p, and rivetting it. On the front face of the said box or
disc p radial teeth or projections p² are made. The revolving fork or
pulverizer is provided with a socket piece q, having on its back radial
teeth g, as before described with reference to Figure 15. The arm of
the revolving fork or pulverizer having been passed into a screwed loop 8,
similar to the loop herein-before described, the screwed stem of the said
loop is passed through the centres of the two parts q, p, and fixed by a
screw nut. The teeth of the socket. piece q are thereby locked with the

page_text: teeth p² of the box or disc p of the revolving fork, and the said fork is
thereby fixed or locked very firmly to the plough tails, and the arm »
of the fork at the same time secured to the socket piece q, as before
explained. The adjustment of the position of the revolving fork or pul-
verizer is effected precisely as described with respect to the revolving
fork of the ridge plough or potato raising plough.
The method of attachment described may also be modified in the
following manner for the purpose of fixing the rotating fork or pulverizer
to the beam or to the tail of the plough:-In this case a loose or separate
disc or box having radial teeth on its face is employed, the back of the
said disc or box having a groove or recess in it in which the beam or tail
of the plough fits. A loose or separate disc of this kind is represented
in Figure 19, where t represents the groove or recess at its back, in which
the beam or plough tail fits. The screw of the loop in which the arm of
the fork or pulverizer is inserted is passed through the socket piece, the
loose disc or box, Figure 19, and a hole in the beam or plough tail, and
by means of a screw nut driven home on the screw of the loop the whole
of the parts are fixed together, and the rotating fork or pulverizer at the
same time fixed to the beam or tail of the plough.
Having now described the nature of my Invention, and the manner in
which the same is to be performed, I wish it to be understood that I do
not limit myself to the precise details herein described and illustrated, as
the same may be varied without departing from the nature of my.
Invention; but I claim as my Invention,-
First. The improvements in ploughs for ploughing two or more furrows
at a time, herein-before described and illustrated in Figures 1, 2, 3, 4,
and 5 of the accompanying Drawings, that is to say, the construction
and combination of parts described and illustrated for regulating the
width of the furrows made by the said ploughs, and for combining and
fixing together two or more plough beams, each beam carrying a plough
body, or a series of grubber or cultivator tines, the same guide wheels
and handles being used, whether the plough consist of one plough body,
or two or more plough bodies, substantially as described and illustrated.
Secondly. The improvements in fixing breasts or mould boards to ridge
ploughs or potato raising ploughs, or ploughs fitted with right and left-
handed mould boards, or with single mould boards, herein-before described
and illustrated in Figures 6, 7, 8, 9, 10, and 11 of the accompanying

page_text: Drawings, that is to say, making on the frame carried by the beam
grooves marked d, d, (or in the case of ploughs with single mould boards
one of the said grooves d), and making on the ends of the mould boards
pins or centre pieces e, e, (or in case of ploughs with single mould boards
one of the said pins or centre pieces e), the said pins or centre pieces
being engaged by a sliding motion with the said grooves d, d, so as to fix
the mould boards to the frame, substantially as described and illustrated.
Thirdly. Constructing mould boards of ridge ploughs and potato raising
ploughs, and single and other ploughs, with a prolonged rear part
marked a² in Figures 6, 7, 9, 12, 13, and 14 of the accompanying
Drawings for carrying the revolving fork or pulverizer; also fixing a
horizontal or inclined bar or bars, or inclined teeth or prongs, as described
and illustrated in Figures 6, 7, and 8, to the bottom part or prolonged
part of the mould boards of the said ploughs for the purpose, and substan-
tially as described and illustrated; also making a wing marked h² in
Figures 6 and 7 on each side of the share or foot of the plough for the
purpose, and substantially as described and illustrated.
Fourthly. The improvements in fastenings for fixing rotating forks or
pulverizers to the rear end of the mould boards of ridge ploughs, potato
raising ploughs, and single and other ploughs, herein-before described
and illustrated in Figures 6, 7, 9, 12, 13, 14, 15, and 16 of the accom-
panying Drawings, that is to say, casting or fixing on the upper part of
the rear end of the mould board a disc having upon it radial surface
teeth or projections, and inserting the arm of the rotating fork or pul-
verizer in a socket picce having at back similar radial teeth or projections,
the teeth on the said socket piece fitting into those on the disc, the said
socket piece and the arm of the fork or pulverizer being firmly fixed,
substantially as described and illustrated.
Lastly. The improvements in fastenings for fixing rotating forks or
pulverizers behind the mould boards of ploughs, herein-before described
and illustrated in Figures 17 and 18 of the accompanying Drawings, that
is to say, fixing on the bar which crosses the plough tails a box or disc
having on its front radial surface teeth or projections, and inserting the
arm of the fork or pulverizer in a socket piece or box having similar
radial teeth or projections on its back, which latter teeth fit into those
on the box or disc, the socket piece and the arm of the fork or pulverizer
being fixed substantially as described and illustrated; also the modifica-

page_text: tion described and illustrated in Figure 19 for fixing the rotating fork or
pulverizer to the beam or tail of the plough.
In witness whereof, I, the said Samuel Corbett, have hereunto set
my hand and seal, this Fifth day of September, in the year of
our Lord One thousand eight hundred and seventy-three.
Witness,
GEORGE WYCHERLEY CORBETT,
Wellington,
Salop.
SAMUEL CORBETT. (L.S.)