IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS
Year: 1868

page_text: LETTERS PATENT to John Garrett Tongue, of the Firm of Tongue
and Birkbeck, Patent Agents and Engineers, of 34, Southampton
Buildings, Chancery Lane, in the County of Middlesex, for the
Invention of "IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS."―
A communication from abroad by Auguste Léon Bézy and Isidore
Agnan Desnoyers, both of Paris, in the Empire of France.
Sealed the 5th September 1868, and dated the 6th March 1868.
PROVISIONAL SPECIFICATION left by the said John Garrett Tongue
at the Office of the Commissioners of Patents, with his Petition,
on the 6th March 1868.
I, JOHN GARRETT TONGUE, of the Firm of Tongue and Birkbeck,
Patent Agents and Engineers, of 34, Southampton Buildings, Chancery
Lane, in the County of Middlesex, do hereby declare the nature of my
said Invention for "IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS,'
to be follows:-
This Invention has for its object the application to steam boilers or
generators (of all kinds and dimensions) of inclined cylindrical or
conical tubes in which the water circulates, and are surrounded by

page_text: flames and highly heated products from the furnace for the purpose
of establishing a continuous circulation of the water, rapid vaporization
being thus effected with great economy of fuel, and the prevention of
incrustation to a considerable extent. The arrangement and construction
of these improved steam boilers also affords increased facility for changing
and cleaning the tubes. The water tubes are inclined in such manner
that being heated at any part of their length or their whole length,
whether it be directly by the furnace or by contact with the flames,
the water therein by reason of the difference of density is put in rapid
motion from the bottom to the top according to their inclination. The
rapid circulation of the water in the tubes carries with it the deposits
it contains, which are prevented from becoming stationary in the tubes,
consequently the adherance of deposits is very trifling. The tubes are
placed at an inclination to the inner body or shell of the boiler, which
by preference is arranged eccentrically in relation to the axis of the
outer shell or envelope of the boiler, thus causing the water to circulate
not only in the tubes but between the inner and outer shell of the
boiler. Suitable doors or man-holes are arranged opposite the tubes
to afford facilities for cleaning or replacing them when required. The
smoke and products of combustion may either pass through a flue into
the smoke box and chimney at the end of the boiler, or they may pass
direct to a chimney arranged through the boiler above the tubes. In
vertical boilers of this improved construction the outer shell or envelope
is constructed in two parts (with spacing pieces). bolted together to
facilitate the cleaning or replacing of the tubes when required, the
chimney been also suitably arranged to admit of the parts being
separated. When conical tubes are employed the smallest diameter is
placed at the highest point, whereby the circulation is increased.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Garrett Tongue in the Great Seal Patent
Office on the 5th September 1868.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
GARRETT TONGUE, of the Firm of Tongue and Birkbeck, Patent Agents
and Engineers, of 34, Southampton Buildings, Chancery Lane, in the
County of Middlesex, send greeting.

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixth day of March, in the year
of our Lord One thousand eight hundred and sixty-eight, in the
thirty-first year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said John Garrett Tongue,
Her special licence that I, the said John Garrett Tongue, my exe-
cutors, administrators, and assigns, or such others as I, the said John
Garrett Tongue, my 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 Channel Islands, and Isle of Man, an Invention
for "IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS," a communi-
cation to me from abroad by Auguste Leon Bézy and Isidore Agnan
Desnoyers, both of Paris, in the Empire of France, upon the condition
(amongst others) that I, the said John rett Tongue, my executors
or administrators, by an instrument in writing under my, or their, or
one of their hands and seals, should part ularly describe and ascertain
the nature of the said Invention, and in what manner the same was
to be performed, and cause the same to be 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 I, the said John Garrett Tongue, do hereby
declare the nature 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 :-
This Invention has for its object the application to steam boilers or
generators (of all kinds and dimensions) of inclined cylindrical or
conical tubes in which the water circulates, and are surrounded by
flames and highly heated products from the furnace for the purpose
of establishing a continuous circulation of the water, rapid vaporization
being thus effected with great economy of fuel, and the prevention of
incrustation to a considerable extent. The arrangement and construction
of these improved steam boilers also affords increased facility for changing
and cleaning the tubes. The water tubes are inclined in such manner
that being heated at any part of their length or their whole length,
whether it be directly by the furnace or by contact with the flames,
the water therein by reason of the difference of density is put in rapid

page_text: motion from the bottom to the top according to their inclination. The
rapid circulation of the water in the tubes carries with it the deposits
it contains, which are prevented from becoming stationary in the tubes,
consequently the adherance of deposits is very trifling. The tubes are
placed at an inclination to the inner body or shell of the boiler, which
by preference is arranged eccentrically in relation to the axis of the
outer shell or envelope of the boiler, thus causing the water to circulate
not only in the tubes but between the inner and outer shell of the
boiler. Suitable doors or man-holes are arranged opposite the tubes
to afford facilities for cleaning or replacing them when required. The
smoke and products of combustion may either pass through a flue into
the smoke box and chimney at the end of the boiler, or they may pass
direct to a chimney arranged through the boiler above the tubes. In
vertical boilers of this improved construction the outer shell or envelope
is constructed in two parts (with spacing pieces) bolted together to
facilitate the cleaning or replacing of the tubes when required, the
chimney being also suitably arranged to admit of the parts being
separated. When conical tubes are employed the smallest diameter is
placed at the highest point, whereby the circulation is increased.
And in order that the Invention may be most fully understood and
readily carried into practice, I will proceed to describe the Drawings

page_text: escape by the flue H and the chimney I, or still more directly by the
chimney K, indicated by red lines in Figure 1.
Figure 4 shows the vertical section of a vertical boiler constructed in
accordance with these improvements taken on the line A, B, of the
horizontal section, Figure 5; Figure 5 is a horizontal section taken on
the line C, D, of Figure 4. In these Figures is again shown the
application in the interior body A of the inclined tubes T, which form
passages for the water enclosed by the exterior envelope B, and which
being briskly heated by the furnace establishes the circulation of the
water in the whole apparatus, and greatly accelerates the vaporization.
The envelope B is constructed in two parts connected at x to facilitate
the removal of the upper part, when it is desired to clean or unfix
the tubes T, for the same reason the chimney I only rests upon the
convex part of the envelope B, and when it is desired to raise the latter
it is necessary to unbolt the flange fixed upon the vertical flue H.
J are spacing pieces placed at suitable distances to maintain the relative
position between the furnace or body A and the envelope B.
Figure 6 represents the longitudinal section of a marine boiler
constructed in accordance with these improvements.
Figure 7 is a transverse section taken on the line C, D, of Figure 6.
The inclined tubes T which effect the circulation of the water are placed
as in the arrangement shown at Figures 1 to 3, that is to say, in the
body of the boiler A placed in the exterior envelope B. The cleaning
as well as the substitution or replacing of the tubes can be effected
by removing the doors G and G' placed opposite the ends of the tubes.
For this latter description of boiler, and for those previously described
(without changing their forms or exterior dimensions), the application
of these improvements will increase their power in a very considerable
cases attain double or more than
proportion, which may in some
double the primative power. With these different forms and arrange-
ments of boilers conical inclined tubes may be employed, as represented
by the red lines in Figure 1. It will be seen that the smallest diameter
of the tubes is placed at the higher part, and not only is the circulation
due to the inclination of the tubes, but it is still further increased by
reason of the differences of the heat absorbed, and in consequence of
the differences of density produced by the heating.
Having thus described the nature of the Invention, and the manner
in which the same is carried into practice, the improvements in the

page_text: construction of steam boilers which are claimed under the above in
part recited Letters Patent, consist in the application to steam boilers
or generators of all kinds, forms, and dimensions of inclined, cylindrical,
or conical tubes for the purpose of establishing a continuous circulation
of water, as herein described and shown in the Drawing hereunto
annexed
construction of steam boilers which are claimed under the above in
part recited Letters Patent, consist in the application to steam boilers
or generators of all kinds, forms, and dimensions of inclined, cylindrical,
or conical tubes for the purpose of establishing a continuous circulation
of water, as herein described and shown in the Drawing hereunto
annexed.
In witness whereof, I, the said John Garrett Tongue, have hereunto
set my hand and seal, this Third day of September, in the year
of our Land One th
1
1
In witness whereof, I, the said John Garrett Tongue, have hereunto
set my hand and seal, this Third day of September, in the year
of our Lord One thousand eight hundred and sixty-eight.