IMPROVEMENTS IN SEPARATING OR DRESSING TIN AND. OTHER ORES." PROVISIONAL. SPECIFICATION
Year: 1872

page_text: LETTERS PATENT to. Samuel Chatwood, of Bolton, in the County of
Lancaster, Safe and Lock Engineer, and Joseph Henry Collins, of
Falmouth, in the County of Cornwall, Mining Engineer; for the
Invention of "IMPROVEMENTS IN SEPARATING OR DRESSING TIN AND. OTHER
ORES."
PROVISIONAL. SPECIFICATION left by the said Samuel Chatwood and
Joseph Henry Collins at the Office of the Commissioners of Patents,
with their Petition, on the 28th June 1872:
Wė, SAMUEL CHATWOOD, of Bolton, in the County of Lancaster, Safe
and Lock Engineer, and JOSEPH HENRY COLLINS, of Falmouth, in the
County of Cornwall, Mining Engineer, do hereby declare the nature of*
the, said. Invention for “IMPROVEMENTS. IN- SEPARATING, OR DRESSING TIN AND
OTHER ORES," to be as follows:-
This Invention. has: for its: object. improvements in separating. on
dressing, tin and other ores.. For this purpose' we' use one or more:
currents of air obtained by means of exhaust or forcing fans or bellows..

page_text: The ores to be treated are first sufficiently pulverized and then allowed
to fall through sieves, slits, holes, or spouts into currents of air artificially
produced, by which means the ores or heavier substances present are
more or less completely separated from the lighter materials or waste.
We find that the ores should be dry, and in order to secure this they
are made to pass through a hot air chamber or over hot plates and are
freed from moisture before being subjected to the blast of current of air.
When the ores contain mundic, wolfram, or other heavy waste we
burn or calcine them in a furnace, and this alters the condition of the
waste so as to render it easily separable by the means above described.
The annexed Drawing shews apparatus for carrying our Invention
into practice.
a is a hopper into which the ore in particles approximately the same
size is fed ; b is a chamber through which the ore from the hopper
falls ; c is a fan producing a rapid current of air which strikes the
falling ore as it issues from the hopper and propels the particles in an
horizontal direction for a greater or less distance in accordance with their
specific gravities; d are trucks which receive the ore as it falls. When
filled the trucks are wheeled out of the chamber 6 and empty trucks
take their places.
น
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Samuel Chatwood and Joseph Henry Collins. in
the Great Seal Patent Office on the 28th December 1872..
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, SAMUEL
CHATWOOD, of Bolton, in the County of Lancaster, Safe and Lock 25
Engineer, and JOSEPH HENRY COLLINS, of Falmouth, in the County of
Cornwall, Mining, Engineer, send greeting,
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-eighth day of June, in the year
of our Lord One thousand eight hundred and seventy-two, in the thirty- 30
sixth year of Her reign; did, for Herself, Her heirs and successors, give
and grant unto us, the said SamuelChatwood and Joseph Henry Collins;

page_text: Her special license that we, the said Samuel Chatwood and Joseph Henry
Collins, our executors, administrators, and assigns; or sudh-others as. we,
the said Samuel Chatwood and Joseph Henry Collins, our executors,
administrators, and 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 Ohannel
Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN SEPARATING
OR DRESSING TIN AND OTHER ORES," upon the condition. (amongst others)
that we, the said Samuel Chatwood and Joseph Henry Collins, our
executors or administrators, by an instrument in writing under our or
their hands and seals, or under the hand and seal of one of us or them,
should particularly describe and ascertain the nature of the said Inven-
tion, and in wliat manner the same was to be performed, and cause the
sámé to be filed in the Great Seal Patent Office within six calendar months
next and immediately after the date of the said Letters Pátent.
-
-
:
NOW KNOW YE, that I, the said Joseph Henry Collins, on behalf
of myself and the said Samuel Chatwood, do hereby declare the naturé
of the said Invention, and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following
statement thereof, that is to say :-
L
This Invention has for its object improvements in separating or
dressing tin and other ores. For this purpose we use one or more currents
of air obtained by means of exhaust or forcing fans or bellows.
The ores to be treated are first sufficiently pulvérized, and then
allowed to fall through sieves, slits; holes, or spouts into currents of
air artificially produced, by which means the ores or heavier substances
present are more or less dompletely separated from the lighter materials
or waste.
We find that the ares should be dry, and in order to sectire this
they are made to pass through a hot air chamber or over hot plates,
and are freed from moisture before being subjected to the blast of current
of air.
When the ores contain mundic, wolfram, or other heavy waste, we
burn or
calcine them in a furnace, and this alters the condition of the
waste, so as to render it easily separable by the means above described....
hum
..

page_text: •
The annexed Drawings shew at Figure 1 a longitudinal section, and
at Figure 2 a transverse section of apparatus for carrying our Invention
into practice.
ii
a is a hopper into which the ore in particles of approximately the
'same size, is fed; 6 is a chamber through which the ore from the o
hopper falls; c is a fan producing a rapid current of air which strikes
the falling ore as it issues from the hopper, and propels the particles
in an horizontal direction for a greater or less distance in accordance
with their specific gravities; d are trucks which receive the ore as it
falls. When filled the trucks are wheeled out of the chamber 6, and 1
empty trucks take their places.
The following is the manner in which we prefer to conduct the
process-The ore is first obtained thoroughly dry, either naturally, or
by artificial means. It must then be divided into particles of equal
size by sifting, and this is most economically done by means of a l
cylindrical inclined sieve, such as is used in dressing flour.
The arrangement of the sieve and the parts connected therewith is
'shown by the Drawings. Figure 3 is a longitudinal section; Figure 4, a¯
transverse section; and Figure 5 is a plan. e is the shoot from the
drying room; fis the hopper by which the screen is fed, and g is the 2
rotating screen of three degrees of fineness.
After the material has been thus divided according to sizes it is
*subjected to the current of air which will be able to act under favorable
circumstances upon the ore; the lighter waste will be driven far away
from the orifice, while the heavier ore will be found near to it; h, h, h, are 2
three blast chambers into which the material from the screen is conducted
by three shoots, so that it falls in front of the blast nozzles i, i, i.
The near end of the resulting pile will probably be nearly pure, and
the far end nearly worthless, but in the middle it will have to be
carefully examined and divided in the most advantageous way for 3
further treatment, a repétition of what has been done or otherwise, as
may be judged best.
The sifted stuff from the sieve being of three sizes falls, and is
subjected to the blast, and blown into separate blast chambers. The
coarse waste which falls from the end of the cylinder must be carefully 3
examined, in order to determine whether it is worth any further
treatment.

page_text: Having thus described the nature of our said Invention, and the
manner of performing the same, we would have it understood that
what we claim is, the method of separating or dressing tin and other ores
by reducing and sorting it into particles of uniform size, and submitting
such particles to an air blast, substantially as described.
In witness whereof, I, the said Joseph Henry Collins, have here,
unto set my hand and seal, this Twenty-fourth day of December,
in the year of our Lord One thousand eight hundred and seventy-
two.