AN IMPROVED STEAM GENERATOR, APPLICABLE TO STATIONARY ENGINES
Year: 1874

page_text: LETTERS PATENT to William Edward Gedge, of No. 11, Wellington
Street, Strand, in the County of Middlesex, Patent Agent, for the
Invention of "AN IMPROVED STEAM GENERATOR, APPLICABLE TO STATIONARY
ENGINES." A communication from abroad by Jean François Renard,
fils, of Liège, Belgium, Machinist.-
Sealed the 30th June 1874, and dated the 9th January 1874.
PROVISIONAL SPECIFICATION left by the said William Edward
Gedge at the Office of the Commissioners of Patents, with his
Petition, on the 9th January 1874.
I, WILLIAM EDWARD GEDGE, of No. 11, Wellington Street, Strand,
5 in the County of Middlesex, Patent Agent, do hereby declare the nature
of the said Invention for "AN IMPROVED STEAM GENERATOR, APPLICABLE TO
STATIONARY ENGINES," a communication to me from abroad by Jean
François Renard, fils, of Liège, Belgium, Machinist, to be as follows:-
Very few of the generators hitherto known give in practice the
O anticipated results, for these apparatuses should combine the following
conditions :-

page_text: 2º. Have at the same time a good water and a good steam chamber.
3°. Utilize perfectly all the products of combustion.
4°. Be simple of construction, and accessible in every part.
5°. Neither be too heavy or too cumbersome.
6°. Accomodate itself to the effects of expansion and contraction.
But it is extremely difficult to reconcile these conditions, and some
are often sacrificed to others, such for example are the generators for
almost instantaneous production of steam, which have great production
of steam power, but the serious defect of no sufficient steam chamber to
relieve the inevitable irregularities of the working of a motive-power
engine. The water chamber being also excessively reduced the necessity
of too often working the feed pump rendering the control of the fire-
place too difficult for obtaining a regular production of steam, and the
tubes rapidly choking with tartar, are reasons which condemn the
system.
The other generators, formed of one or more cylindrical bodies, boiler
tubes, or heating tubes, notwithstanding the various advantages which
they present produce too little steam in proportion to the quantity of
fuel consumed, are heavy and cumbersome, and their setting up is
expensive.
The multitubular steam generator with exterior fire-place, applicable
to stationary engines, the subject of this Invention, is illustrated on the
accompanying two Sheets of Drawing; Fig. 1, Sheet I., being a longi-
tudinal elevation of same; Fig. 2, Sheet II., a section at A, B, Fig. 1;
and Fig. 3 a section at C, D, Fig. 1.
A, A¹, are cylindrical bodies united by a tube B of a diameter one
half less to the two tube plates C, C¹, of the main bodies A and A',
thus rendering the combination of parts very strong and free from
deformation. These three bodies A, and A³, and B, serve at the same
time as water and as steam chamber. By this arrangement the tubular
-plates C, C¹, may receive a considerable number of steam tubes, which
are exposed to the direct action of the fire; the flame and the gasses
after having traversed the sheaf of tubes go into the two flues D, D¹,
(Fig. 3). Behind the fire-bridge is formed a reservoir G, which receives
all the particles of coal carried away by the gasses.
The main body A¹ exceeds by about 16 to 20 inches (0" 40 to 0™ 50°)
the length of the steam tubes, so as to render their fixing easy, and

page_text: facilitate the removal of incrustation, the feed taking place by the
bottom end H; this part of the generator serves at the same time as
reservoir for the calcareous deposits accumulating within it.
It will be evident that this generator being accesible in all its parts
its cleansing is easy; the steam tubes are freed from incrustation by
the aid of two steel borers of different diameters.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Edward Gedge in the Great Seal Patent
Office on the 3rd July 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
EDWARD GEDGE, of No. 11, Wellington Street, Strand, in the County
of Middlesex, Patent Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Ninth day of January, in the year of our
Lord One thousand eight hundred and seventy-four, in the thirty-
seventh year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said William Edward Gedge, Her special
licence that I, the said William Edward Gedge, my executors, adminis-
trators, and assigns, or such others as I, the said William Edward
Gedge, my executors, administrators, and assigns, should at any time
agree with, and no others, from time to time and at all times there-.
after 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 "AN IMPROVED STEAM GENERATOR, APPLICABLE TO STATIONARY ENGINES,"
a communication to me from abroad by Jean François Renard, fils, of
Liège, Belgium, Machinist, upon the condition (amongst others). that
I, the said William Edward Gedge, my executors or administrators, by
an instrument in writing under my, or their, or one of their hands and'
seals, should particularly 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.

page_text: NOW KNOW YE, that I, the said William Edward Gedge, 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, reference being had to the accom-
panying Sheet of Drawing, and to the figures and letters of reference 5
marked thereon :—

page_text: A, A¹, are cylindrical bodies united by a tube B of a diameter one
half less to the two tube plates C, C¹, of the main bodies A. and A', thus
rendering the combination of parts very strong and free from de-
formation. These three bodies A and A¹, and B, serve at the same
time as water and as steam chamber. By this arrangement the tubular
plates C, C¹, may receive a considerable number of steam tubes, which
are exposed to the direct action of the fire; the flame and the gasses
after having traversed the sheaf of tubes go into the two flues D, D¹
(Fig. 3). Behind the fire-bridge is formed a reservoir G, which receives
all the particles of coal carried away by the gasses.
The main body A¹ exceeds by about 16 to 20 inches (0º 40 to 0º 50º)
the length of the steam tubes, so as to render their fixing easy, and
facilitate the removal of incrustation, the feed taking place by the
bottom end H; this part of the generator surves at the same time as
reservoir for the calcareous deposits accumulating within it.
It will be evident that this generator being accessible in all its parts
its cleansing is easy; the steam tubes are freed from incrustation by the.
aid of two steel borers of different diameters.
ITS CONSTRUCTION AND PROPORTIONS.
This generator is exceedingly simple of construction, it is made of
round and cylindrical bodies free from deformation, without the aid of
draw bolts or tie pieces. The steam tubes receiving the pressure
exteriorly the metal supports it much better. As to its proportions, they
are relatively reduced; for example, the generator shown on the Drawing
at a scale of sth has about 82 ft.3 in. (25" 9) of heating surface, and
its main dimensions are 16 ft. 4 in. (5 mètres) in length by 3 ft. 7 in.
(110) in diameter; to obtain this heating surface from an ordinary
generator the enormous dimensions of 39 ft. 4in. (12 mètres) in length
by 3ft. 7in. (1 10) in diameter would be required.
Saving of Fuel. The principle upon which the saving of fuel is based
rests entirely upon the great concentration of the direct heating surface,
the free disengagement of the steam, the perfect utilization of the
products of combustion, and the cost of the fuel, which must be
consumed for at least two hours in ordinary generators to raise the
pressure.
It is generally admitted that a direct heating surface can evaporate
tom and more new hour and Der 29 square inches

page_text: 4°. Good steam and water chamber.
.5. Ordinary form of construction, simple and essentially practicable, 1
repairs easy, ordinary working, and easy inspection, cleansing and
freeing from incrustation.
In witness whereof, I, the said William Edward Gedge, have here-
unto set my hand and seal, this Third day of July, in the year
of our Lord One thousand eight hundred and seventy-four.
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