THE TREATMENT OF CERTAIN MATERIALS USED IN GRINDING, SMOOTHING, AND POLISHING GLASS, AND APPARATUS EMPLOYED IN THE SAID TREATMENT." PROVISIONAL SPECIFIC
Year: 1874

page_text: LETTERS PATENT to Robert Daglish and George Heaton Daglish,
.
of St. Helen's, in the County of Lancaster, Engineers, for the
Invention of "THE TREATMENT OF CERTAIN MATERIALS USED IN GRINDING,
SMOOTHING, AND POLISHING GLASS, AND APPARATUS EMPLOYED IN THE SAID
TREATMENT."
PROVISIONAL SPECIFICATION left by the said Robert Daglish and
George Heaton Daglish at the Office of the Commissioners of
Patents, with their Petition, on the 30th July 1874.
We, ROBERT DAGLISH and GEORGE HEATON DAGLISH, of St. Helen's,
in the County of Lancaster, Engineers, do hereby declare the nature
of the said Invention for "THE TREATMENT OF CERTAIN MATERIALS USED IN
GRINDING, SMOOTHING, AND POLISHING GLASS, AND APPARATUS EMPLOYED IN THE
SAID TECATMENT," to be as follows :—

page_text: from sand obtained by crushing or breaking stone, sharp keen cutting
sand of any required degree of fineness of division, suitable for use in
grinding, smoothing, and polishing plate or other glass.
Under the first part of our Invention wo treat natural, crushed,
silicious, or other sand by subjecting it to the action of heat in revolving 5
cylindrical or other vessels, or on the hearths of reverberatory or other
furnace. A temperature raising the mass of the sand to a dull red heat
is sufficient.
Under the second part of our Invention we separate the sand into
different qualities of fineness in fluids, cither in air by projection from a ]
fan over a collecting floor, or by agitation in water or other liquid con-
tained in a vessel, such vessel being provided with movable trays, which
aro pushed into the vessel from time to time, the lower trays receiving
by deposition the larger particles, and the higher ones receiving the finer
and finer particles upwards.
Sand treated under the first part of our Invention may be treated by
sifting or ordinary means of separating particles of one size from those
of another size.
Under the third part of our Invention we employ apparatus consisting
of inclined cylindrical vessels, so arranged that they can be rotated. 2
Heat is by preference applied to the external surface of the said vessels.
The sand is fed at the higher end, and allowed to escape in a continuous
stream from the lower end, or the sand is supplied and removed from
time to time.
When the sand is very coarse, and it is desired to materially reduce
the size of the particles, the cylindrical vessels are fitted with internal
projections to raise the sand, and allow it to full. Agitation is thereby
made to aid in the process of pulverization.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent
filed by the said Robert Daglish and George Heaton Daglish in the
Great Scal Patent Office on the 30th January 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, wc, ROBERT
DAGLISH and GEORGE HEATON DAGLISH, of St. Helen's, in the County
of Lancaster, Engineers, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Thirtieth day of July, in the year of
our Lord One thousand eight hundred and seventy-four, in the thirty-
cighth year of Her reign, did for Herself, Iler heirs and successors,
give and grant unto us, the said Robert Daglish and George Heaton
Daglish, Her special licence that we, the said Robert Daglish and Georgo
Heaton Daglish, our exccutors, administrators, and assigns, or such
others as we, the said Robert Daglish and George Heaton Daglish, 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, usc,
excrcise, and vend, within the United Kingdom of Great Britain and
Ireland, the Channel Islands, and Isle of Man, an Invention for “THE
TREATMENT OF CERTAIN MATERials used in GrINDING, SMOOTHING, and POLISHING
GLASS, AND APPARATUS EMPLOYED IN the said TreatmENT," upon the condition
(amongst others) that we, the said Robert Daglish and George Heaton
Daglish, our executors or administrators, by an instrument in writing
under our, or their, or one of our or their hands and scals, should par-
ticularly describe and ascertain the nature of the said Invention, and in
what manner the same was to be performed, and cause the same to bo
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 we, the said Robert Daglish and George
Heaton Daglish, do hereby declare the nature of our said Invention,
and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement, reference
being bad to the accompanying Sheet of illustrative Drawings, and to
the figures and letters marked thereon, that is to say :—
The object of our Invention is to obtain from sea or other sand, or
from sand obtained by crushing or breaking stone, sharp keen cutting

page_text: Fig. 3 is a sectional clevation showing further means of treating sand
under the first part of our Invention. The sand A is fed on to the hearth
of the reverberatory furnace 9 through the door h, and the flames from
the fire in the grate i are allowed to play over the surface of the said
5 sand.
It will be obvious that the means and apparatus for carrying the first
part of our Invention into practice may be greatly varied.
Fig. 4 is an elevation illustrative of the second part of our Invention.
The sand A is supplied to the fan j through the hopper k, and is ejected
O by the air blast at 1, so as to be spread over the floor m; the finer
particles are carried further than the larger particles, thus separating the
finer and coarser qualities.
Fig. 5 shows a second method of effecting the above object. The sand
after being treated under the first head is poured into the trough of
water ; when the coarsest particles have had time to fall to the bottom
all the trays o are drawn into the position o¹, so as to catch the particles
as they settle.
Fig. 6 shows another modification of our Invention. The treated sand
is poured into the trough p, where the large grains fall to the bottom,
the finer being carried by a stream of water into p', p³, and so on, the
lowest vessel containing the finest sand.
Fig. 7 is a view illustrative of the third part of our Invention. The
sand A is fed at q into the inclined rotating cylinder ", such sand
escaping at 8. Heat is applied to the outside of the cylinder.
When coarse sand is used we prefer that the cylinder should be
provided with ribs.
Having now sufficiently described and illustrated the nature of our
said Invention, we claim,―
Under the first head, the treatment of sand, substantially as and for
the purposes set forth.

page_text: Under the third head, treating sand in the manner and by the
appliances substantially as described and illustrated.
In witness whercof, I, the said George Heaton Daglish, have
hereto set my hand and scal, the Twenty-eighth day of January,
in the year of our Lord One thousand eight hundred and seventy-t
five.
In the presence of
JAMES JOHNSON,
Patent Office,
Clayton Square,
Liverpool.
GEO. II. DAGLISH. (L.S.)