IMPROVEMENTS IN THE CONSTRUCTION AND MOUNTING OF THE STEAM PROVISIONAL SPFICATION
Year: 1874

page_text: LETTERS PATENT to William Rudd Oswald and Thomas Ridley Oswald,
both of Sunderland, in the County of Durham, for the Invention
of "IMPROVEMENTS IN THE CONSTRUCTION AND MOUNTING OF THE STEAM
PROVISIONAL SPECIFICATION left by the said William Rudd Oswald
and Thomas Ridley Oswald at the Office of the Commissioners of
Patents, with their Petition, on the 25th July 1874.
We, WILLIAM Rudd Oswald and THOMAS RIDLEY OSWALD, both of
Sunderland, in the County of Durham, do hereby declare the nature
of the said Invention for "IMPROVEMENTS IN THE CONSTRUCTION AND MOUNTING
OF THE STEAM BOILERS OF LOCOMOTIVE, PORTABLE, TRACTION, AND OTHER ENGINES,"
to be as follows :—
This Invention has for its object improvements in the construction
and mounting of the steam boilers of locomotive, portable, traction, and

page_text: The boiler we construct is of a round form, mounted horizontally, and
filled to above its centre line with small longitudinal flame tubes. It is
arranged to fit in a tank, as shewn in the Drawing hereunto annexed,
and is supported in this tank from beams fixed to each side of tank, and
hung as shewn in Drawing. The boiler is arranged to fire externally {
underneath, and the sides of the boiler (to the level of top row of
tubes) are open to the flame from the furnace and connected with the
furnace. The flame on leaving the furnace travels along underneath the
boiler and around the sides into a combustion chamber behind, from
thence it returns through the small tubes to a front chamber, and thence]
up chimney.
The tank is arranged so as to form a hot-water tender for locomotives
and a feed heater for other engines, the flame passing along the sides of
this at same time as it passes along boiler.
The advantages derived from this construction are that considerably 1
more heating surface is obtained than in boilers of the ordinary type.
Loss of heat from radiation is also prevented, the boiler being enveloped
in heat. Also for locomotives having the water tender and engine in
one the tractive and adhesive power will be much larger than in ordinary
ones, and the weight to draw will be less. All the advantages of the a
type of engine known as the saddle tank (over the boiler) are obtained
without its disadvantages. The construction is also much more simple
than in the present type, and is much cheaper to manufacture. A
stronger boiler than present types is obtained, and may be worked to
higher pressures with safety. There is also unusual accessability for
repairs, the boiler being so arranged that it can be easily lifted bodily
out of its seat without interfering with the machinery. The weight is
also well down, and thereby a much steadier working engine will be
obtained, and an engine that can be driven above the ordinary speeds.
The horn plate frame to which engine is attached can be fixed to the
tank independently altogether of the boiler, thus doing away with the
cxcessive strains caused by the vibration of engines on the boiler,
which on present types is too frequently found to have an injurious
effect.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Rudd Oswald and Thomas Ridley Oswald
in the Great Seal Patent Office on the 25th January 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, WILLIAM
RUDD OSWALD and TнOмÁS RIDLEY OSWALD, both of Sunderland, in
the County of Durham, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-fifth day of July, in the year
of our Lord One thousand eight hundred and seventy-four, in the thirty-
eighth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said William Rudd Oswald and Thomas
Ridley Oswald, Her special license that we, the said William Rudd
Oswald and Thomas Ridley Oswald, our executors, administrators, and
assigns, or such others as we, the said William Rudd Oswald and Thomas
Ridley Oswald, our 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 66
IMPROVEMENTS IN THE CONSTRUCTION AND MOUNTING OF THE
STEAM BOILERS OF LOCOMOTIVE, PORTABLE, TRACTION, AND OTHER ENGINES," upon
the condition (amongst others) that we, the said William Rudd Oswald
and Thomas Ridley Oswald, our executors or administrators, by an
instrument in writing under our or their hands and seals, or under
the hand and seal of one of us or them, 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.
NOW KNOW YE, that we, the said William Rudd Oswald and Thomas'
Ridley Oswald, 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 improvements in the construction
and mounting of the steam boilers of locomotive, portable, traction, and

page_text: without its disadvantages. The construction is also much more simple
than in the present type, and is much cheaper to manufacture. A
stronger boiler than present type is obtained, and may be worked to
higher pressures with safety. There is also unusual accessibility for
repairs, the boiler being so arranged that it can be easily lifted bodily
out of its seat without interfering with the machinery. The weight is
also well down, and thereby a much steadier working engine will
be obtained, and an engine that can be driven above the ordinary
speed.
The horn plate frame to which engine is attached can be fixed to the
tank independently altogether of the boiler, thus doing away with the
excessive strain caused by the vibration of engine on the boiler which
on present types is too frequently found to have an injurious effect.
Having thus described the nature of our Invention, and the manner
of performing the same, we would have it understood that we claim,—
1. The construction and mounting of the boilers of locomotive,
portable, traction, and other engines, substantially as herein described.
2. The combined arrangement of fire-box, boiler, and surrounding
tank, with flues between the boiler and tank, substantially as herein
described.
3. The combined arrangement of locomotive, portable, or traction
engine substantially as herein described and shewn in the Drawing