AN IMPROVEMENT OR IM- PROVEMENTS UPON THE SCREW PRESS USED IN THE PRESSING OF PAPER, BOOKS, TOBACCO, OR BALE GOODS, AND IN THE EXPRESSING OF OIL, EXTRACTS, OR TINCTURES, AND FOR VARIOUS OTHER PURPOSES IN WHICH GREAT PRESSURE IS REQUIRED
Year: 1826

page_text: TO ALL TO WHOM THESE PRESENTS. SHALL COME, I, DANIEL
DUNN, of King's Row, Pentonville, in the Parish of Saint James, Clerkenwell,
in the County of Middlesex, Manufacturer of Essence of Coffee and Spices,
sendeth greeting.
WHEREAS His most Excellent Majesty George the Fourth, did, by
His Letters Patent under the Great Seal of that part of the United King-
dom of Great Britain and Ireland called England, bearing date at West-
minster, the Twenty-third day of May, One thousand cight, hundred and
twenty-six, in the seventh year of His reign, give and grant unto: mc, .tho
said Daniel Dunn, my exors, adñiors, and assigns, His especial licence, full
powers, sole privilege, and authority that I, the said: Daniel Dunn, my exors,
admiors, and assigns, during the term of years therein mentioned, should and
lawfully might make, use, exercise, and vend, in England and Wales, and the
Town of Berwick-upon-Tweed, my. Invention of "AN IMPROVEMENT OR IM-
PROVEMENTS UPON THE SCREW PRESS USED IN THE PRESSING OF PAPER, BOOKS,
TOBACCO, OR BALE GOODS, AND IN THE EXPRESSING OF OIL, EXTRACTS, OR TINCTURES,
AND FOR VARIOUS OTHER PURPOSES IN WHICH GREAT PRESSURE IS REQUIRED;" in
which said.Letters Patent there is contained a proviso, .that; if I, the said
Daniel Dunn, shall not particularly describe and ascertain the nature of my
said Invention, and in what manner the same is to be performed, by an
instrument in writing. under my hand and. seal, and cause the same to bo
inrolled in His Majesty's High Court of Chancery within six calendar. months
next and immediately after, the date of the said Letters, Patent, that then

page_text: the said Letters Patent, and all liberties and advantages whatsoever thereby
granted, shall utterly cease, determine, and become void, 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
Daniel Dunn, do hereby declare that my said Invention of "an improvement
or improvements in the screw press used in the pressing of paper, books, or
bale goods, and in the expressing of oil, extracts, or tinctures, and for various
other purposes in which great pressure is required," is herein particularly
'ascertained and described, and ellucidated by the Drawings hereunto annexed
(that is to say):
My Invention consists in the application of a ratchet wheel to the main
screw of the press, and of a lever acting with various degrees of power, and
communicating that power to the wheel by means of a connecting link or
hook pulling, or by a thrusting piece pushing in or upon the ratchets of the
said wheel. And the manner of carrying my said Invention into effect is
shewn in Figures 1, 2, 3, and 4, the same letters of reference indicating the
same parts in all the Figures.
Fig. 1, elevation of a press of a common construction, with the addition
of my ratchet wheel and a pin, upon which the fulcrum of the level acts;
Fig. 2, plan of the press, with the upper beam represented as broken, in order
to show the nut and ratchet wheel; Fig. 3, front view of the lover, fulcrum
pin, and supporting pin; Fig. 4, front view of the connecting link or hook,
which is also prolonged, to perform the part of a thrusting piece as well as
of a hook. (a), the frame of the press; (b), the main screw; (c), the nut;
(d), the ratchet wheel, having two sets of ratchets, the set on the edge of the
wheel being for the hook to pull the screw around for tightening the press,
and the set on the flat of the wheel being for the thruster to act in for
loosening the press; (e), the platten, suspended from the screw in the usual
way; ), the lever; (g), the fulcrum pin or bolt, on which the lever acts;
(h), studs, with eyes to receive the fulcrum bolt; (k), a pin, to be put into
one of a series of holes in the check of the press, in order to support the
lever at various heights, so as to act in the ratchets as the screw varies in
height; (7), the hook and thrusting piece; (m), the bolt on which the hook
turns; (n), a plate, fastened upon the stem of the hook, to lie upon the
ratchets, and prevent the hook from falling down through the ratchets; (p),
holes in the lever to receive the bolt of the hook at various distances from
the fulcrum, according as more or less power is required.
In executing this my Invention I do not confine myself to any particular
materials, but I prefer cast iron for the ratchet wheel, wrought iron for that

page_text: part of the lever near the fulcrum, and wood for the handle, and I make the
book of wrought iron with bits of steel at the parts working in the ratchets.
In witness whereof, I, the said Daniel Dunn, have hereunto set my
band and seal, this Twenty-first day of September, One thousand eight
hundred and twenty-six.