CERTAIN IMPROVEMENTS IN THE CONSTRUCTION OF MACHINES OR ENGINES
Year: 1806

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
KENTISH, of Baker Street North, in the Parish of Saint Marylebone, in
the County of Middlesex, Esquire, sends greeting.
WHEREAS His present most Excellent Majesty King George the Third,
in and by His Letters Patent under His Great Seal of the United Kingdom
of Great Britain and Ireland, bearing date at Westminster, the Twentieth
day of February, in the forty-sixth year of His reign, for Himself, His
heirs and successors, did give and grant unto me, the said Thomas Kentish,
my exors, admors, and assigns, His especial licence, full power, sole privilege
and authority, that I, the said Thomas Kentish, my exors, admors, and
assigns, and every of them, by myself and themselves, or by my and
their deputy or deputies, servants or agents, or such others as I, the said
Thomas Kentish, my exors, admors, and assigns, should at any time agree
with, and no others, from time to time and at all times hereafter during
the term of years therein expressed, should and lawfully might make, use,
exercise, and vend, within that part of His Majesty's United Kingdom called
England, His Dominion of Wales and Town of Berwick-upon-Tweed, and
also in all His said Majesty's Colonies and Plantations abroad, my Invention
of "CERTAIN IMPROVEMENTS IN THE CONSTRUCTION OF MACHINES OR ENGINES

page_text: APPLICABLE TO THE MOVING, RAISING, OR LOWERING OF HEAVY BODIES AND WEIGHTS
OF ALL KINDS, EITHER UPON LAND OR ON BOARD OF SHIPS AND VESSELS, AND
TO VARIOUS OTHER USEFUL PURPOSES;" in which said Letters Patent there is
contained a proviso obliging me, the said Thomas Kentish, by an instrument
in writing under my hand and seal, particularly to describe and ascertain
the nature of my said Invention, and in what manner the same is to be
performed, and to cause the same to be inrolled in His said Majesty's High
Court of Chancery within one calendar month next and immediately after
the date of the said. recited Letters Patent, as in and by the same, relation
being thereunto had, will more fully and at large appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
Thomas Kentish, do hereby describe and ascertain the nature of my said
Invention, and the manner in which the same is to be performed, by the
Drawings delineated in the margin of these Presents, and as follows, that
is to say :-
In Figure 1 represents part of a ship, and to describe the manner in which
the machinery is affixed to a derrick or crane. A, the derrick, which may be
fixed to a ship's main yard, main mast, fore mast, or any other convenient
place, or to a strong post in the ground,. upon land, or to the side of a
building, &c. B, the purchase wheel, from two fect diameter to six or ten, as
the purchase may require; the grove to admit the rope to pass round to be
three or three and a half inches deep; the thickness of the wheel and frame to
be from four to eight inches, according to the quantity of rope required to be
wound round it. The purchase wheel may be affixed to any part of a derrick
or crane; as may be found best adapted or convenient for its use. C, the
axletree of the wheel B, iron, covered with wood, to be formed in inclined
planes from three feet long to six feet or more; the diameter in the centro
from six to twelve inches, according to the power desired. D, D, four iron:
bars to support the purchase wheel, from half an inch to one inch thick.
E, E, two iron bolts through the center of the derrick to fix on the bars D, D,
with iron or brass nuts and screws. F, a roller formed of wood, with an iron
axletree, to take the rope off the purchase wheel B, six or eight inches diameter
at each end, and about four inches or more in the center, with two inclined
planes, the one on the right about two inches long, and fluted, to hoist the weight
up, the other side from center to the left one inch long, plain; the two inclined
planes at forty-five degrees angle of slope to lower the weight down. G, G,
four iron plates or bars to support and fix the roler F with iron bolts, nuts,
and screws with flat heads. H, H, the handles fastened to the ends of.
the ron axletree of the roller F by spring keys chained to the handles to turn

page_text: the roller in hoisting, and to be taken off when lowering. I, the rope which
passes round the purchase wheel B, and through the center of the derrick, and
is taken off by the roller F, to be two inches round or more, if required. K, a
shiver fixed in a groove cut through the centre of any part of the derrick, as
may be found most convenient for the rope I to pass through. L, L, the rope
to wind round the axletree C, on each side of the purchase wheel B, from four
and a half inches to five inches round. M, two blocks to be hooked or fixed
to the head of the derrick or crane for the rope L to lead through. N, a
shiver to extend and keep the rope L, and to prevent it from taking a turn;
it may be a straight stick or block. O, a large hook fastened to N with
a strong iron strap, to hook slings upon, or any other articles. P, the stop for
the derrick or crane. Q, the guy to support the head of the derrick or cranc,
which may be hoisted or lowered as occasion may require. R, the thwart
guys. S, a ship's main mast. T, the main yard, either square or to be
topped up to fix the guys to. V, the deck of a ship.
Figure 2 shews the form and construction of the purchase wheel B, in
a front view, with the iron plates for supporting the same.
Figure 3 shews the roller F with its inclined planes, and fluted in part of
its center, with the handles fixed on.
Figures 4 and 5 represents two cranes, with the purchase wheel B and
roller F, with other parts of the machinery, delineated in Figure 1, with the
same references, in order to shew how they are applied to cranes and other
engines of the like nature made use of upon wharfs, warehouses, and other
places, and also that the dimensions and strength of which must depend on
the weight required to be raised. The position of the different parts of the
machinery may be altered, transposed, and adopted in different ways, as may
be found most elegible to the situation in which they are to be fixed, and to
various purposes where the moving heavy bodies and hoisting and lowering
weights of all kinds is required, either upon land or on board of ships and
vessels.
In witness whereof, I, the said Thomas Kentish, have hereunto set
my hand and seal, this Nineteenth day of March, in the forty-sixth

page_text: AND BE IT REMEMBERED, that on the Nineteenth day of March, in
the year of our Lord One thousand eight hundred and six, the aforesaid
Thomas Kentish came before our said Lord the King in His Chancery,
and acknowleged the Specification aforesaid, and all and every thing therein
contained and specified, in form above written. And also the Specification
aforesaid was stampt according to the tenor of the Statute made for that
purpose.