IMPROVEMENTS IN THE MANUFACTURE OF SALT
Year: 1836

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOSEPH
HALL, of Margaret Street, Cavendish Square, in the County of Middlesex,
Plumber, send greeting.
WHEREAS His present most Excellent Majesty King William the Fourth,
by His Letters Patent under the Great Seal of Great Britain, bearing date
at Westminster, the Seventeenth day of August, in the seventh year of His
reign, did, for Himself, His heirs and successors, give and grant unto me, the
said Joseph Hall, His especial licence, full power, sole privilege and authority,
that I, the said Joseph Hall, my exors, admors, and assigns, or such others
as I, the said Joseph Hall, my exors, admors, or assigns, should at any
time agree with, and no others, from time to time and at all times during
the term of years therein expressed, should and lawfully might make, use;.
exercise, and vend, within England, Wales, and the Town of Berwick-upon-
Tweed, and also in all His said Majesty's Colonies and Plantations abroad,
my Invention of "IMPROVEMENTS IN THE MANUFACTURE OF SALT;" in which
said Letters Patent is contained a proviso that I, the said Joseph Hall,
shall cause a particular description of the nature of my said Invention,
and in what manner the same is to be performed, to be inrolled in His.
said 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.

page_text: NOW KNOW YE, that in compliance with the said proviso, 1, the said
Joseph Hall, do hereby declare the nature of my said Invention, and
the manner in which the same is to be performed, are fully described and
ascertained in and by the following statement thereof, reference being had to
the Drawings hereunto annexed, and to the figures and letters marked thereon
(that is to say):
:-
My Invention consists of a mode of drawing salt from covered salt pans.
DESCRIPTION OF THE DRAWING.
Figure 1 represents a section of a salt pan; Figure 2, a plan thereof; and
Figure 3 is a transverse section of a salt pan, showing my improvements
applied thereto, in each of which Figures the same letters are used to indicate
similar parts, a, a, being the bottom of the salt pan. b, b, are pockets or
receivers at each end of the pan, in which the salt is drawn by the scrapers, as
herein-after described. c, c, the cover of the pan, which it will be seen has
folding shutters d, d, at each end, which, dipping into the brine contained in
the pan, produce a closing of the ends sufficiently steam-tight, yet, when it is
desired to skim the pan, they may be lifted in order that the scum brought up
by the working of the scrapers (and which scum lies on the upper surface of the
brine) may pass from within the cover, and float on the brine contained in the
pockets or receivers, from whence it may be removed with the usual perforated
scummer. e, e, are outlets for the passage of steam generated by boiling of
the brine in the pan a, a. These outlets e, e, being connected by suitable
pipes with other pans having external casings or double bottoms (as is
well understood), the steam generated in one pan may be advantageously
employed in heating other pans; but the using of the steam generated in one
pan to heat the brine of another or other pans forms no part of my Invention.
ff, is a track or way in which the wheels 9, g, run; these wheels g, g,
are on axles fixed to the end frames h, h, which frames carry the scraper
or scrapers i, i, the frames being braced together by the ties or bars j,j, and they
at the same time are only of such a distance apart that they admit of the sliding
of the scraper or scrapers between them. The scraper i may be of one
sheet of iron, or other suitable material, but it will, in a wide pan, be found
more convenient to have it of many parts, each part being suspended by a
chain or other suitable means to the bar k, on which bar there are two
pulleys, l, which turn freely thereon, around which pulleys the chains m, m,
pass, and they also pass partly round the drums n, n, the axes o, o, of which
drums n, n, turn in suitable bearings, and one of the axes passes through the
cover c, there being a stuffing box for that purpose. Thus, by a crank handle

page_text: or other suitable means, the scrapers i, i, may from time to time be caused to
pass slowly from end to end of the pan a, a, carrying with it the salt, and
causing it to fall into the pockets or receivers at the end of the pan, from
whence it can be removed from time to time by the workman.
By the foregoing description, it will be evident that extensive covered salt
pans may be drawn with facility, and I would remark, that altho' I have
herein described a particular means or apparatus for drawing the scraper i, i,
to and fro to remove the salt from the pan a, a, yet it will be evident that
variations may be made without departing from my Invention, which I declare
to consist of the scraper or scrapers i, i, capable of being drawn to and fro
in order to remove the salt into pockets or receivers in closed pans above
described.
In witness whereof, I, the said Joseph Hall, have hereunto set my
hand and seal, this Seventeenth day of February, in the year of our
Lord One thousand eight hundred and thirty soven