AN IMPROVEMENT IN MACHINERY USED IN THE MANUFACTURE OF PAPER
Year: 1831

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
HALL the younger, of Dartford, in the County of Kent, Engineer, send
greeting.
WHEREAS His most Excellent Majesty King William the Fourth did, by
His Letters Patent under the Great Seal of the United Kingdom of Great
Britain and Ireland, bearing date at Westminster, the Fourth day of August
now last past, give and grant unto me, the said John Hall the younger, my
exors, admors, and assigns, His especial licence,' full power, sole privilege and
authority, that I, the said John Hall the younger, my exors, admors, and
assigns, and no others, from time to time, and at all times during the term
of years therein expressed, should and might lawfully make, use, exercise, and
vend, within that part of the said United Kingdom of Great Britain and
Ireland called England, the Dominion of Wales, and Town of Berwick-upon-
Tweed, the Invention, communicated to me by a certain Foreigner residing
abroad, of "AN IMPROVEMENT IN MACHINERY USED IN THE MANUFACTURE OF PAPER;"
in which said Letters Patent there is contained a proviso obliging me, the said
John Hall the younger, 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 said description
thereof to be enrolled in His Majesty's High Court of Chancery within
six calendar months next and immediately after the date of the said in part
recited Letters Patent, as in and by the same (reference being thereunto
had) will more fully and at large appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
John Hall the younger, do hereby declare that the nature of the said Inven-*

page_text: tion, and the manner in which the same is to be performed, are fully described
and ascertained by reference to the Drawing hereunto annexed, and the
following description thereof, that is to say:―
of
Fig. 1 is a sectional elevation of an improved strainer to be used as herein-
after described during process of reducing rags into pulp for the manufacture
paper, the said sectional elevation being taken through the axis, and showing
a portion of the engine in which it is made to revolve during the said process
of reducing the rag into pulp; Fig. 2 is a transverse section; and Fig. 3, a
plan of the same, in which latter Fig. is also represented the engine and
engine roll. In each of the said Figures similar letters refer to similar parts.
The cylindrical strainer A consists of two, three, or more rings a, a, a, of brass,
copper, or other suitable material (but three will be found most convenient),
having a number of arms b, b, b, b (Fig. 1), fixed on a wrought-iron spindle C,
so that the said spindle shall pass immediately through the centre of the said
rings, thereby forming the axis on which the cylindrical strainer is to revolve.
The said rings a, a, a, are pierced with an indefinite number of holes at equal
distances from each other, as shewn in Fig. 1, to receive the transverse bars
d, d, d, d (Figs. 2 and 3), which are by this means fixed in the said rings in a
position parallel to the axis C. The said bars may be constructed of similar
material as the rings, or otherwise, as most convenient. A cylindrical frame-
work being thus formed, it is covered with woven or laid wire drawn tight
over it, and secured at the ends by two or more hoops of copper, brass, or
other metal, or may be fastened to the rings a and the bars d by metal wire.
The meshes or interstices of the said woven wire should be of the dimensions
usually employed in the strainers of paper engines: the said woven wire is not
represented in the Drawing, to avoid confusion. The ring a 1 (Figs. 2 and 3).
being that nearest the middle plank e, e, of the engine B), is formed with a
projection f,f(Figs. 2 and 3), the outside edge of which corresponds with and
(when the strainer is at work) revolves against a semicircular piece of metal
9,9, projecting from the said middle plank e, e; a receptacle is thus formed
at g, g, into which the water from the inside of the cylinder is received, and
from thence it passes off to the waste pipe down the passage h, h, Figs. 1 and 2,
formed in the middle plank e. The opposite end a 2, Figs. 2 and 3, of the
cylinder is closed with flat plates or boards of wood to prevent the stuff or
pulp contained in the engine B from entering the interior of the said cylinder,
and for the same purpose the outside of the projections ƒ and g is covered with
a piece of list, tape, or other suitable material drawn tight round it. The
passage for the waste water may, if necessary, be formed at the side of the
engine at a, Fig. 2, and in that case the projections ƒ and g must be placed in

page_text: a relative situation, that is to say, against the ring a 2; and the end a 1 of the
cylinder must then be closed with flat plates or boards in lieu of the said
end a 2, as above described. The cylinder A being thus properly constructed
and placed in the engine B in the position shewn in the Drawing, it is caused
to revolve in the pulp contained in the said engine by means of the bevil
wheel i communicating by proper gear with the necessary moving power. The
engine roll C, being of a similar construction to those usually employed, is
caused at the same time to revolve by suitable gear, and by the motion of the
said roll the pulp or rag is driven in the direction of the arrow in Fig. 3,
against the woven wire on the cylindrical strainer A, and as the said strainer
also revolves as before said, a constant, free, and large surface of straining
wire is exposed to the flow of pulp or rag, to take off the surplus or dirty
washing water from the engine B, and as this cylindrical strainer A is placed
in a part of the engine B where the flow of the pulp is even, but a very small
portion of the fine fibres of the rag can pass through the wire with the
washing water, and consequently a great waste of the rag is avoided when
compared with the usual method.
Now, having described the said improvement in machinery used in the
manufacture of paper, I do hereby declare that I do not claim as the Invention
communicated to me by a Foreigner any of the separate parts of the above-
described machinery; but I claim as the said Invention the circular strainer
above described.
In witness whereof, I, the said John Hall the younger, have hereunto
set my hand and seal, this Thirtieth day of February, One thousand