IMPROVEMENTS IN PANS OR BOILERS TO BE USED IN MELTING PITCH ASPHALTE AND LIKE SUBSTANCES AND COMPOUNDS
Year: 1883

page_text: LETTERS PATENT to John Barr Stewart of Liverpool in the County of
Lancaster Engineer and Boiler Maker for an Invention of "IMPROVEMENTS
IN PANS OR BOILERS TO BE USED IN MELTING PITCH ASPHALTE AND LIKE
SUBSTANCES AND COMPOUNDS
"2
PROVISIONAL SPECIFICATION left by the said Jolin Barr Stewart at the
Office of the Commissioners of Patents on the 27th March 1883.
28
JOHN BARR STEWART, of Liverpool in the county of Lancaster, Engineer and
Boiler Maker, IMPROVEMENTS IN PANS OR BOILERS TO BE USED IN MELTING
PITCH ASPHALTE AND LIKE SUBSTANCES AND COMPOUNDS
"
The main objects are to provide cheap pans or boilers capable of melting satis-
factorily and with economy pitch asphalte or the like or mixtures thereof with tars
oils or similar substances.
Hitherto pans or boilers for the above purpose have been heated externally and
have been costly on account of requiring a double casing, and rapidly deteriorating
and becoming unfit for use through sediment settling over the fire or furnace so as
to prevent the free passage of heat to the substance or material being melted
thereby causing excessive consumption of fuel with the result of burning and
destroying the bottoms of such pans or boilers
My invention consists essentially in so constructing pans or boilers that the heat
from the furnace acts on the substance being melted mainly at some distance above
the bottom of the said pan or boiler so that any sediment formed shall not rest on
the crown of the furnace,
Under the first part. I construct a pan or boiler of any suitable shape with a
furnace rising internally and having the bottom either open or closed.
Under the second part. I construct a pan or boiler substantially as above set
forth with a return flue constructed in manner similar to the furnace or passing
through the body of the pan or boiler.
Under the third part. I construct a pan or boiler with an internal furnace and
return flue.
Under the fourth part. I combine with any of the above improvements pipes or
flues for conveying into the furnace the gases given off from the pitch or like
substance or mixture whilst heated.
Under the fifth part. I construct a pan or boiler with an internal furnace in
combination with pipes or flues for conveying into the furnace the gases evolved
from the pitch or like substance whilst heated.
:

page_text: .
i
.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Barr Stewart in the Great Seal Patent Office on the
27th September 1883.
John Barr StewART of Liverpool in the county of Lancaster, Engineer and
Boiler Maker, " IMPROVEMENTS IN PANS OR BOILERS TO BE USED IN MELTING
PITCH ASPHALTE AND LIKE SUBSTANCES AND COMPOUNDS,"
The main objects are to provide cheap pans or boilers capable of melting satis-
factorily and with economy pitch asphalte or the like or mixtures thereof with tars
oils or similar substances.
Hitherto pans or boilers for the above purpose have been heated externally and
have been-costly on account of requiring a double casing and rapidly deteriorating
and becoming unfit for use through sediment settling over the fire or furnace so as
to prevent the free passage of heat to the substance or material being melted
thereby causing excessive consumption of fuel and with the result of burning
and destroying the bottoms of such pans or boilers.
My invention consists essentially in so constructing pans or boilers that the heat
from the furnace acts on the substance being melted mainly at some distance above
the bottom of the said pan or boiler so that any sediment formed shall not rest on
the crown of the furnace.
124
Under the first part. I construct a pan or boiler of any suitable shape with a
furnace rising internally and having the bottom either open or closed.
Under the second part I construct a pan or boiler substantially as above set
forth with a return flue constructed in manner similar to the furnace or passing
through the body of the pan or boiler.
Under the third part. I construct a pan or boiler with an internal furnace and
return flue.
:
Under the fourth part. I combine with any of the above improvements pipes or
flues for conveying into the furnace the gases given off from the pitch or like
substance or mixture whilst heated.
Under the fifth part. I construct a pan or boiler with an internal furnace in
combination with pipes or flues for conveying into the furnace the gases evolved
from the pitch or like substance whilst heated
DESCRIPTION OF THE DRAWINGS
In all the views the same letters denote like parts.
Fig 1 is a longitudinal and fig 2 a transverse section of the simplest form of a
pan or boiler under my invention and illustrative of the first part thereof. The
shell of the pan or boiler is of wrought metal plates a and is carried on wheels or
on a brick or stone foundation or otherwise, b is an arch shaped furnace. rising
from the bottom into the interior of the body of the pan or boiler. The furnace b
which runs from end to end of the pan or boiler is formed of metal plates rivetted
or bolted together and to the shell a, c firegrate and bars: d chimney, e plate
closing the bottom of the furnace when the pan or boiler is carried on wheels.
When it is set on a foundation the said plate may be dispensed with. f draw
off tap.
Fig 3 is a longitudinal and fig 4 a transverse section of a portable pan or boiler
constructed under the second part of my invention. Here in addition to the
furnace b there is a return flue g; and under the fourth part of my invention the
pan or boiler is provided with a cover h and pipes or flues i leading therefrom to

page_text: the furnace through the fire box j. k furnace door. I carrying wheels. Instead
of constructing the return flue as shown it might pass through the body of the pan
or boiler as illustrated in Fig 5.
Fig 5 is a transverse section of a pan or boiler constructed in accordance with
the third part of my invention here both the furnace b and the return flue g are
within the body of the boiler. If desired the return flue might rise from the bottom
of the pan or boiler as shown in Fig 4.
Fig 6 is a longitudinal section of a pan or boiler having the improvements set
forth under the fifth part of my invention. b is an internal furnace extending
from end to end of the pan or boiler, having the fire grate at one end and commu-
nicating directly with the chimney at the other. This pan or boiler is further
provided with the cover h and pipes or flues i for conveying to the furnace the
gases given off by the pitch or like substance when heated.
It will be evident that any of the pans or boilers may be carried on wheels or be
otherwise supported and that the shape may be varied although the nearly rectan-
gular forin shown is in practice found most convenient and that any sediment will
collect in the spaces below the crowns of the furnaces and return flues whence it
may be removed from time to time.
Having now described and illustrated the said invention in such manner that
others will be enabled to carry my improvements into effect I claim :-
First.. A pan or boiler with a furnace rising internally and having the bottom
open or closed for the purpose set forth.
Second. A pan or boiler with a furnace rising internally and a return flue
substantially as set forth.
Third. A pan or boiler with an internal furnace and return flue substantially as
set forth.
Fourth. In combination with a pan or boiler constructed under the first, second,
or third parts, pipes or flues i, for the purpose set forth.
Fifth. A pan or boiler with an internal furnace and pipes or flues ¿ in combination
substantially as and for the purposes set forth.
In Witness Whereof I the said John Barr Stewart have hereunto set my hand
and seal this twenty sixth day of September in the year of Our Lord, one thousand,
eight hundred and eighty three.
TATTY
CARITY I TH
JOHN
ΑΤΤΙ
BARR STE
TATYT
(L.S.)