Improvements in and relating to Locomotive Bollers.
Year: 1898

page_text: Date of Application (in United Kingdom), 3rd June, 1898
Complete Specification Left, 2nd Mar., 1899-Accepted, 8th Apr., 1899
Improvements in and relating to Locomotive Bollers.
I, HENRI THUILE, Engineer, of the Port of Alexandria, Egypt, do hereby
declare the nature of this invention to be as follows:-
This invention relates to a type of boiler of great power, for locomotives.
In express locomotives as at present constructed, the necessity of having wheels
of large diameter, on the one hand, to reduce the tangential velocity of the
parts and, on the other, the necessity of situating the cylindrical body or por-
tion between these wheels, if it be not desired to raise to an inordinate height
the centre of gravity of this body, cannot allow a diameter very much more than
1.25 metre (about 49.22 inches) to be given to a cylindrical boiler or body.
Under these conditions the surface of a tubular boiler is very limited since
experience has shewn that it is unwise to exceed a certain length of tubes. The
result is that the power of locomotives as now constructed cannot be increased
in very great proportions. Now the necessities of connections and transport in
modern life require the attaining of greater speeds whilst drawing heavier and..
heavier loads, which double result can only be attained by means of a much
more powerful motor.
This system of boiler enables me to obtain a power much greater than that
of cylindrical boilers under the most favourable circumstances hitherto known.
The annexed drawing illustrates in vertical section a boiler constructed accord-
ing to my system.
The body of the boiler is formed of two vertical side plates A A about 1 10
metre apart stayed together as may be found desirable, for example on the
axes xxx. . . ; the lower and upper end plates A A¹ are similarly formed of
metal plates, dished or curved, and held in position by means of vertical cross
pieces or ribs, girders or couplings similar to the types employed for the strong-
thening of the roofs of locomotive fire boxes.
Further the whole may be supported and strengthened by angle irons, of HT
or other suitable section.
A similar cross-piece by itself or combined with an exterior support, enables
this boiler to resist pressures of 20 kilogrammes per square centimetre and more.
This boiler is furnished up to a certain height with smoke tubes B which serve
as supports, stays or cross pieces for the tubular plates; the upper portion B
serves as a steam chest; it is riveted to the locomotive's fire box and extends
through a smoke box to two compartments joined or coupled together and separ-
Price S

page_text: ated by a vertical partition situated in the vertical plane Y Y passing through
or along the longitudinal axis of the boiler.
is
In each of the compartments of the smoke box terminates the escape tube of
one or more cylinders placed on the same side of the locomotive; the escape
effected or takes place at the base of a smoke-pipe CC, there being a separate
one for each compartment.
On account of the necessity of placing in the width of the tubular boiler two
conjoint smoke pipes, horizontal elliptical sections whose larger axes are parallel
to the longitudinal axis of the boiler and whose smaller axes are in the same
straight line, can be given to the smoke pipes. A boiler so constructed affords
considerable power since, for example, a tubular boiler of 4.50 metres length,
110 metre width and 225 metres height in which" Serve" or internally-reeded
tubes of 0.065 metre diameter occupy about two-thirds of that height, possesses
a tubular area of 350 square metres, and contains nearly 6 cubic metres of water
and two cubic metres of steam. Such a boiler is therefore especially suited to
express locomotives.
I, HENRI THUILE, Engineer, of the Port of Alexandria, Egypt, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement;-
This invention relates to a type of boiler of great power, for locomotives.
In express locomotives as at present constructed, the necessity of having wheels
of large diameter, on the one hand to reduce the tangential velocity of the
parts and, on the other, the necessity of situating the cylindrical body or por-
tion between these wheels, if it be not desired to raise to an inordinate height
the centre of gravity of this body, cannot allow a diameter very much more than
1.25 metre (about 49.22 inches) to be given to a cylindrical boiler or body.
Under these conditions the surface of a tubular boiler is very limited since
experience has shewn that it is unwise to exceed a certain length of tubes. The
result is that the power of locomotives as now constructed cannot be increased
in very great proportions. Now the necessities of connections and transport in
modern life require the attaining of greater speeds whilst drawing heavier and
heavier loads, which double result can only be attained by means of a much
more powerful motor.
This system of boiler enables me to obtain a power much greater than that
of cylindrical boilers under the most favourable circumstances hitherto known.
The accompanying drawing shews in cross section a boiler constructed accord-
ing to my invention.
The body of the boiler is formed of two vertical side-plates about 1.10 metre
apart and stayed together as may be found desirable c.g. on the axes ; the
lower and upper end plates are similarly formed of metal plates, dished or curved.
and held in position by means of vertical cross pieces or ribs, girders or couplings

page_text: similar to the types employed for the strengthening of the roofs of locomotive
fire boxes.
Further, the whole may be supported and strengthened by angle irons, of H, T
or other suitable section.
A similar cross-piece by itself or combined with an exterior support, enables
this boiler to resist pressures of 20 kilogrammes per square centimetre and more.
This boiler is furnished up to a certain height with smoke tubes B which serve
as supports, stays or cross-pieces for the tubular plates; the upper portion B₁
serves as a steam chest; it is riveted on one side to the locomotive's fire box and
is prolonged by a smoke box having two compartments juxtaposed together and
separated by a vertical partition situated in the vertical plane yy passing through
or along the longitudinal axis of the boiler.
In each of the compartments of the smoke box terminates the escape tube of
one or more cylinders placed on the same side of the locomotive; the escape is
effected or takes place at the base of a smoke-pipe CC, there being a separate
one for each compartment.
On account of the necessity of placing in the width of the tubular boiler two
conjoint smoke pipes, horizontal elliptical sections whose larger axes are parallel
to the longitudinal axis of the boiler and whose smaller axes are in the same
straight line, can be given to the smoke pipes.
A boiler so constructed affords considerable power since, for example, a tubular
boiler of 4.50 metres length, 1.10 metre width and 2.25 metres height in which
"Serve" or internally-reeded tubes of 0.065 metre diameter occupy two-thirds of
that height possesses a tubular area of 350 square metres, and contains nearly
6 cubic metres of water and two cubic metres of steam. Such a boiler is there-
fore especially suited to express locomotives.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
A type of locomotive boiler essentially formed of a shell or body of a decided
rectangular section with vertical side plates furnished with smoke tubes which
open on one side into the fire box placed at one extremity of the boiler shell, on
the other side into two smoke boxes forming the other extremity, these two
smoke boxes being juxtaposed, and separated by a vertical partition and sup-
plied each with a smoke pipe, as above explained and set forth with regard to
the diagrammatical drawing annexed.