IMPROVEMENTS IN AGRICULTURAL IMPLEMENTS, SUCH AS ARE USED FOR DRILLING, GRUBBING, AND SIMILAR OPERATIONS
Year: 1869

page_text: LETTERS PATENT to Michael Jack, of Cramond, in the County of
Mid Lothian, North Britain, for the Invention of "IMPROVEMENTS
IN AGRICULTURAL IMPLEMENTS, SUCH AS ARE USED FOR DRILLING, GRUBBING,
AND SIMILAR OPERATIONS."
Sealed the 11th January 1870, and dated the 14th July 1869.
PROVISIONAL SPECIFICATION left by the said Michael Jack at the
Office of the Commissioners of Patents, with his Petition, on the
14th July 1869..
I, MICHAEL JACK, of Cramond, in the County of Mid Lothian,
North Britain, do hereby declare the nature of the said Invention of
"IMPROVEMENTS IN AGRICULTURAL IMPLEMENTS, SUCH AS ARE USED FOR DRILLING,
GRUBBING, AND SIMILAR OPERATIONS," to be as follows, that is to say :-
This Invention which relates to an improved implement to be used
for agricultural purposes consists in employing two or more grubbers

page_text: or a drill, either combined or singly, mounted on a shaft carried upon
a wheel, the shaft constituting a handle by which the workman actuates
it upon the ground to be treated by the grubbers or drill. The grubbers
are held to the shaft by a shank or shanks passed through a socket
formed in the body of the shaft and held therein by a pin or bolt,
whilst they are adjustable in position by means of a screw and nut in
connection with that part of the shank or shanks situated above the
shaft. The drill may also be attached and made adjustable in a similar
manner to the grubbers, but it may also be carried on a stud situated on
the under side of the shaft.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Michael Jack in the Great Seal Patent Office on
the 13th January 1870.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, MICHAEL
JACK, of Cramond, in the County of Mid Lothian, North Britain, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fourteenth day of July, in the year
of our Lord One thousand eight hundred and sixty-nine, in the 33d
year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said Michael Jack, Her special license that I,
the said Michael Jack, my executors, administrators, and assigns, or
such others as I, the said Michael Jack, my executors, administrators,
or 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 "AN IMPROVED AGRICULTURAL IMPLEMENT,"
upon the condition (amongst others) that I, the said Michael Jack, by
an instrument in writing under my hand and seal, 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: seen more particularly in plan at Figure 2. The screw d is supported
on the shaft or bar A by the bracket x, as shown, or it may be supported
in any other suitable manner.. In order to pass the wheel B and
grubbers D of the implement over any stone or other obstruction a
lever or support rod F is provided, which is attached to the under side
of the shaft or bar A, in the manner shown in the Drawing, or it may
be otherwise attached. In lieu of attaching two or more grubbers to
the shaft or bar A, as hercin-before set forth, one or more drills may
be so attached, or grubbers and a drill or drills may be used in com-
bination.
At Figure 3 is shown an enlarged side elevation, and at Figure 4 an
enlarged front elevation of the grubbers herein-before described in
reference to Figures 1 and 2.
At Figure 5 is shown a front elevation of another grubber. In this
modification the blades A of the grubbers are projected beyond the
shanks B, as shown at x.
At Figure 6 is shown a front elevation of a third modification of the
grubbers. In this instance the shanks A of the grubbers are attached
by means of eyes B formed on their upper ends to a cross bar C by
which they are secured in the slot of the shaft or bar of the implement.
The grubbers are made adjustable on the cross bar C by means of the
pinching screws x as shown, or they may be otherwise adjusted. In
lieu of forming the blades a of the grubbers, as shown in Figure 6,
they may be made similar to those shown at Figures 3 and 4.
Having now described the nature of my said Invention, and the
system, mode, or manner in or under which the same is or may be used
or practically carried into effect, I would observe in conclusion that
what I consider novel and original, and therefore claim as the In-
vention secured to me by the herein-before in part recited Letters
Patent is,―
First. The employment of one or more grubbers or drills in com-
bination with a shaft or bar carried on one wheel, the whole constituting
a new or improved implement, as herein-before described and shown
on the appended Sheet of Drawings.

page_text: Second. The lever or support bar F, shown at Figures 1 and 2 of the
appended Sheet of Drawings.
In witness whereof, I, tho said Michael Jack, have hereunto set my
hand and seal, this Eleventh day of January Eighteen hundred
and seventy.
MICHAEL JACK. (L.S.)