IMPROVEMENTS IN APPARATUS FOR SCREENING COALS AND OTHER MATERIALS
Year: 1866

page_text: LETTERS PATENT to William Poupard, of Blackfriars Road, in the
County of Surrey, Engineer, for the Invention of "IMPROVEMENTS IN
APPARATUS FOR SCREENING COALS AND OTHER MATERIALS."
Sealed the 21st December 1866, and dated the 23rd June 1866.
PROVISIONAL SPECIFICATION left by the said William Poupard at the
Office of the Commissioners of Patents, with his Petition, on the
23rd June 1866.
I, WILLIAM POUPARD, of Blackfriars Road, in the County of Surrey,
Engineer, do hereby declare the nature of the said Invention for "IMPROVE-
MENTS IN APPARATUS FOR SCREENING COALS AND OTHER MATERIALS," to be as
follows:-
Coals are now ordinarily screened by causing them to slide down an inclined
shoot composed of straight longitudinal bars or plates placed side by side
with a space of about ths of an inch, more or less, between them; but
it has been found necessary to adopt supplementary appliances or means to
cause the smaller coals and dust to pass through between the bars, as the
coals otherwise reach the bottom of the shoot insufficiently screened.
Now my Invention consists in the employment, instead of the ordinary
straight bars, of bars fitted lengthwise of the screen or shoot, and so formed
or shaped that the whole of the coal while sliding down the shoot must
necessarily pass alternately over a part of such bars and over the space or
opening between them, whereby the coal is sufficiently screened without the
aid of supplementary appliances or means. I employ for the purpose of my

page_text: Invention bars of serpentine or zig-zag or other forms which will produce
the effect before described.
My Invention applies also to screening other materials, for instance, wire-
work-screens used for various substances may be constructed with the wires
fitted in the manner before explained in reference to the bars.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Poupard in the Great Seal Patent Office on the
22nd December 1866.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
POUPARD, of Blackfriars Road, in the County of Surrey, Engineer, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-third day of June, in the year of our Lord
'One thousand eight hundred and sixty-six, in the thirtieth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said William Poupard, Her special licence that I, the said William
Poupard, my executors, administrators, and assigns, or such others as I, the
said William Poupard, my executors, administrators, and assigns should at any
time agree with, and no others, from time to time and at all times there-
after 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 ." IMPROVE-
MENTS IN APPARATUS FOR SCREENING COALS AND OTHER MATERIALS,"
upon the
condition (amongst others) that I, the said William Poupard, my executors or
administrators, by an instrument 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.
NOW KNOW YE, that I, the said William Poupard, do hereby declare the
nature of my said Invention, and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following state-
ment thereof, reference being had to the Drawings hereunto annexed, that is
to say
Coals are now ordinarily screened by causing them to slide down an
inclined shoot composed of straight longitudinal or diagonal bars or plates

page_text: placed side by side with a space of about ths of an inch, more or less,
between them; but it has been found necessary to adopt supplementary
appliances or means to cause the smaller coals and dust to pass through
between the bars, as the coals otherwise reach the bottom of the shoot
insufficiently screened.
Now my Invention consists in the employment, instead of the ordinary
straight bars, of bars which while being fitted lengthwise of the screen or
shoot and forming continuous openings in that section of the screen of which
they constitute a part are so formed or shaped that the whole of the coal
while sliding down the shoot must necessarily pass alternately over a part of
such bars and over the space or opening between them, whereby the coal is
sufficiently screened without the aid of supplementary appliances or means.
I prefer to employ for the purpose of my Invention bars of serpentine, or
zig-zag, or similar form which will produce the effect above described.
Figure 1 of the accompanying Drawings represents a couple of my
serpentine bars, a, a; each bar has formed on one side thereof and at or
about the middle a projection 6 for the purpose of keeping the bars at the
proper distance apart in the screen.
Figure 2 is a plan of a coal screen constructed with my serpentine bars.
c, c, is one section or portion of the screen composed of the bars a, a, which
rest at their ends, which are straight, upon the ordinary supports at d, e ; f, f,
is another section or portion, the bars a, a, of which rest at their ends upon
the supports at e, g.
My Invention also applies to screening other materials, for instance, wire-
work screens used for various substances may be constructed with the wires
fitted in the manner before explained in reference to the bars.
And having now described the nature of my said Invention, and in what
manner the same is to be performed, I declare that I claim constructing
apparatus for screening coals and other materials, substantially in the manner
herein-before described and represented in the accompanying Drawings.
In witness whereof, I, the said William Poupard, have hereunto set my
hand and seal, this Twenty-second day of December, One thousand
eight hundred and sixty-six.
W. POUPARD. (L.S.)