CERTAIN IMPROVEMENTS IN THE BOILERS USED FOR MAKING SALT, COMMONLY CALLED SALT PANS, AND IN THE MODE OF APPLYING HEAT TO THE BRINE
Year: 1827

page_text: TILT'S SPECIFICATION.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOSEPIT
TILT, of Prospect Place, in the Parish of St George, Southwark, in the
County of Surry, Merchant, send greeting.
WHEREAS I, the said Joseph Tilt, in consequence of a communication
made to me by a person residing abroad, am in possession of an Invention of
"CERTAIN IMPROVEMENTS IN THE BOILERS USED FOR MAKING SALT, COMMONLY CALLED
SALT PANS, AND IN THE MODE OF APPLYING HEAT TO THE BRINE;" and whereas
His present most Excellent Majesty King George the Fourth, by His Letters
Patent under the Great Seal of Great Britain, bearing date at Westminister,
the Fourth day of April, in the eighth year of His reign, did, for Himself,
His heirs and successors, give and grant unto me, the said Joseph Tilt, His
especial licence that I, the said Joseph Tilt, my exors, admors, and assigns,
or such others as I, the said Joseph Tilt, 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, the said Invention of "Certain Improvements in the Boilers used
for making Salt, commonly called Salt Pans, and in the Mode of applying
Heat to the Brine;" in which said Letters Patent is contained a proviso,
obliging me, the said Joseph Tilt, by an instrument in writing under my
hand and seal, particularly to describo and ascertain the nature of the said
Invention, and in what manner the same is to be performed, and to cause

page_text: the same 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 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
Joseph Tilt, do hereby declare the nature of the said Invention to consist,
first, in roofing over or otherwise covering the bottom, or part of the
bottom, of a salt pan in such manner that the salt as it chrystalizes falls on
the said roof or covering instead of falling on the bottom of the pan, and
rolls down the sides of the said roof or covering into boxes or moulds placed at
the eves or lower extremities of the said sides to catch the same, whereby the
inconveniences and loss occasioned by panscratch is avoided. Secondly, the
said Invention doth further consist in heating the brine contained in the said
pan by introducing fire, steam, or other heating media under the said roof or
covering in manner herein-after described.
And in further compliance with the said proviso, I, the said Joseph Tilt, do
hereby describe the manner in which the said Invention is to be performed
by the following description thereof, reference being had to the Drawing
annexed, and to the figures and letters marked thereon (that is to say):-
DESCRIPTION OF THE DRAWING.
:
Figure 1 represents a transverse section of the said Invention. A, A, is an
oblong square vessel, made in the earth, which is in fact the boiler or salt pan
for holding the brine. It is lined with brick, and puddled on the outsides,
with double walls at the ends, filled in betwixt with clay, puddle, or other
cement. B, B, is a roof of sheet iron, closed at both ends, and raised over the
bottom of the pan, extending nearly the whole width and length of the pan,
and with pipes protruding at each end through. the double walls before
described. The lower part of this roof is let into and cemented in the brick-
work forming the bottom of the pan, and this roof must be so constructed as to
prevent any brine leaking through it at any part: C is a partition, with a
coping at the top, running nearly from end to end of the pan, through the
centre of the space formed by the roof, for the purpose of distributing the heat
more evenly against the sides of the roof, and also preventing the heat from
acting too violently against the top angle of the roof; D, D, are two steam pipes
for admitting steam under the roof to heat the brine; E, E, is the space to be
filled with brine; F, F, are two boxes or moulds perforated with small holes,
placed so low in the brine as not to be acted upon by the heat under the roof, and
into which the chrystals of salt fall as they roll off the sides of the, roof; G, G;

page_text: are cords for drawing up the said boxes when full of salt. These boxes may
either be long troughs with compartments to divide the salt into lumps or
blocks, or a series of boxes or moulds may be used, so as to occupy the whole
length of the space assigned to them. Figure 2. is a side section of Figure 1,
cut off in the middle, because the steam pan may be of almost any length,
generally about eighty feet. D is one of the steam pipes for the introduction of
steam under the roof to heat the brine, and J is an escape pipe for the steam
when it has performed this office. It is evident that the steam may be con-:
veyed by the escape pipe J, either to heat other brine, or for other purposes of the
manufacture.
The Figures heretofore described represent the said Invention ! when
steam is used as the heating medium; but when fire is used a different modi-
fication is required, as shewn in the next Figure. P is a pipe for drawing.
off any condensed steam that may 'collect.. Figure 3. represents a transverse-
section of a boiler or salt pan with the roof before described, but adapted to be.
heated by fire. Those parts of this Figure which are marked with similar
letters to those used in the other Figures denote similar parts; but it will be
observed that the part of the bottom wall marked X in Figures 1 and 2 is:
done away with in this Figure, and-fire bars marked r are substituted, while
the space occupied by the wall serves here for the ash-pit. The partition C
should in this case be made of fire brick or cast iron. Figure 4 represents a
longitudinal section of Figure 3, and shews how far the fire bars extend. S is
a back to the firé bars, and the space T carries the heat through the remaining
length of the roof; W is either a continuation of the roof to carry on the heat
to other pans, or else is the chimney, as occasion may require. In this
Figure it will be observed that the end of the roof is projected through the
double end walls. Figure 5 represents an end view of the said Invention as
described at Figs. 3 and 4, and shows. the external appearance of this modifi-
cation of the said Invention; H is a fire or furnace door to feed the grate or
fire bars with fuel. I have not thought it necessary to state any degree of
heat to be used in the improved pans, because they are susceptible of being
used at all the heats which are required by salt makers for the various sorts
of salt they manufacture.
Now, whereas it is evident that the outer vessel or salt pan may be made of
various shapes and of various materials, it may even be made of wood, and
portable, by means of the said Invention; and whereas the said roof or
covering also may be made of various shapes or materials, or may even be
made as a part of the bottom of the salt pan. But whereas I claim as the
said Invention the following improvements (that is to say):

page_text: First, I claim the roof herein-before described, or any similar contrivance
whereby the chrystals of salt as they are formed are directed-in-their descent
--into boxes or moulds, as herein-before described, thereby preventing the for-
mation of panscratch; as also I claim the said boxes or moulds so placed as
aforesaid for the purposes aforesaid.
And, secondly, I claim the mode, herein-before described, of heating the
brine by introducing heat for that purpose under the said roof, or other
similar contrivance.
And such improvements being to the best of my knowledge and belief
entirely new and never before used within that part of His said Majesty's
United Kingdom of Great Britain and Ireland called England, His said
Dominion of Wales, or Town of Berwick-upon-Tweed, nor in any of His
said Majesty's Colonies or Plantations abroad, I do hereby declare this to be
.my Specification of the same, and that I do verily believe this my said Speci-
fication doth comply in all respects fully and without reserve or disguise with
the proviso in the said herein-before in part recited Letters Patent contained;
wherefore I do hereby claim to maintain exclusive right and privilege to the
said Invention.
In witness whereof, I, the said Joseph Tilt, have hereunto set my hand
and seal, this Third day of October, in the year of our Lord One
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