Improvements in Means for Rendering Invisible Steam Escaping from Engines and Boilers.
Year: 1899

page_text: Date of Application, 18th Feb., 1899
Complete Specification Left, 7th Nov., 1899-Accepted, 23rd Dec., 1899
PROVISIONAL SPECIFICATION.
Improvements in Means for Rendering Invisible Steam Escaping from
Engines and Boilers.
JOHN ERNEST WALLIS, Erdesley, Basingstoke, Engineer, and WALLIS &
STEEVENS LTD., Basingstoke, Hants, Engineers, do hereby declare the nature of
this invention to be as follows:-
It is often required with steam engines, especially those employed in public
places, that no exhaust steam or steam from a safety or escape valve, should be
visible, but at the same time the exhaust steam or a jet of live steam is necessary
to maintain the requisite draught for the fire. This invention provides a means
of disposing of the steam without its becoming visible, and at the same time
causing no impediment to the draught caused by the exhaust or escaping steam.
The object is to enable a sufficient volume of dry or heated air together with
the products of combustion from the fire to be at all times mixed with the exhaust
or escaping steam before it is discharged into the open air, thus rendering it
practically invisible. For this purpose we pass the products of combustion
together with the heated air passing through and over the fire, into a smokebox,
chimney or other chamber, where it mixes with the exhaust or escaping steam.
To enable us to maintain the requisite heat and the requisite volume of air for
the absorption of the exhaust or escaping steam, but at the same time regulate
the heat necessary to be imparted to the boiler to maintain the steam pressure,
we place a tube or tubes, or a flue or flues, with one or more dampers or valves,
to regulate the current of heated air and the products of combustion from the
fire, so that it may either pass through or over the boiler imparting heat to it,
and thence to the smokebox, chimney, or other chamber where it mixes with the
exhaust or escaping steam, or pass to the smokebox, chimney, or other chamber
where it mixes with the exhaust or escaping steam, imparting part or none of the
heat to the boiler.
The valve or valves may be regulated so that the heated air and products of
combustion can pass wholly in either way, partly in either way at the same time,
or be wholly closed.
The before mentioned tube or tubes, or flue or flues can be of any form, and
placed in or outside the boiler as found most convenient.
Dated this Seventeenth day of February 1800
JOHN ERNEST WALLIS,
WALLIS & STEEVENS LIMITED,
FRANCIS A. WALLIS,
Director.
W. ALFRED WALLIS,

page_text: COMPLETE SPECIFICATION.
Improvements in Means for Rendering Invisible Steam Escaping from
Engines and Boilers.
We, JOHN ERNEST WALLIS, Erdesley, Basingstoke, Engineer and WALLIS AND
STEEVENS LTD., Basingstoke, Hants, Engineers, do hereby declare the nature of
this invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
It is often required with steam engines, especially those employed in public
places, that no exhaust steam or steam from a safety or escape valve should be
visible, but at the same time the exhaust steam or a jet of live steam is necessary
to maintain the requisite draught for the fire. This invention provides a means
of disposing of the steam without its becoming visible, and at the same time
causing no impediment to the draught caused by the exhaust or escaping steam.
The object is to enable a sufficient volume of dry or heated air together with
the products of combustion from the fire to be at all times mixed with the exhaust
or escaping steam before it is discharged into the open air thus rendering it
practically invisible. For this purpose we pass the products of combustion
together with the heated air passing through and over the fire into a smokebox,
chimney or other chamber where it mixes with the exhaust or escaping steam,
To enable us to maintain the requisite heat and the requisite volume of air for
the absorption of the exhaust or escaping steam, but at the same time regulate
the heat necessary to be imparted to the boiler to maintain the steam pressure,
we place a tube or tubes or a flue or flues with one or more dampers or valves
to regulate the current of heated air and the products of combustion from the
fire so that it may either pass through the boiler imparting heat to it and thence
to the smokebox, chimney or other chamber where it mixes with the exhaust or
escaping steam or pass to the smokebox, chimney or other chamber where it
mixes with the exhaust or escaping steam imparting part or none of the heat to
the boiler. The valve or valves can be regulated so that whilst the heated air
and products of combustion are passing through the boiler to heat it, the flue or
flues before mentioned are closed, or vice versa, or the valve or valves can be regu-
lated so as to pass varying portions of the heated air and products of combustion
both ways at the same time.
The before mentioned tube or tubes or flue or flues can be of any form and
placed in or outside the boiler as found most convenient.
In the accompanying drawings our invention is shown as applied to a light
locomotive provided with what is known as a loco-multitubular boiler, but it is
equally applicable to any existing type of steam engine and boiler.
Fig. 1. Shows a light road locomotive or traction engine in side elevation fitted
with an external flue or "
pass-by" and valves.
Fig. 2. Shows the same in end elevation.
Fig. 3. Shows a light road locomotive or traction engine in side elevation with
an internal flue and valve.
Fig. 4. Shows the same in end elevation.
In Figs. 1 and 2:-
A is a firebox, B the tubes through which the products of combustion pass to
heat the water, C the smokebox, D the chimney, E the outlets in the side of the
firebox passing into the " pass-by" or flue F. G is a valve regulating the outlet
from the tubes B. His a valve regulating the outlet from the flue F, I and K
are levers and I¹ and K¹ rods connecting the valves G and H to the lever L which
is provided with a quadrant and thumb nut to enable it to be held in any required
position. Thus when the lever L is placed in its most forward position the whole
of the heated air and the products of combustion from the firebox pass through
the tubes B, the flue F being closed by the valve H and when the lever L is

page_text: placed in its most backward position the whole of the heated air and the products
of combustion from the firebox pass through the flue F, the tubes B being closed
by the valve G, and if the outlet regulated by the valve G is equal in area to that
of the tubes B and the outlet regulated by the valve H is equal in area to the
inlet into the flue F, it follows that by altering the position of the lever L which
regulates both valves G and H the heated air and the products of combustion from
the firebox can be conveyed in varying ratio through the tubes B or the flue F,
at the same time imparting as much or little heat to the tubes B as required. Mis
a pipe conveying the exhaust steam from the engine cylinder into the chimney D.
N is a pipe conveying the steam from the safety valve to the chimney D. O is
a hinged ashpan for closing in the under side of the firebox when the engine is
standing still.
In Figs. 3 and 4:-
P is the firebox, Q the tubes through which the heated air and the products of
combustion pass to heat the water, R the smokebox, S the chimney, T the " pass-
by" or flue, U the valve regulating the flow of the heated air and the products
of combustion through the tubes Q and the flue T, or partly both ways, V is a
lever and Va rod connecting the valve U with the lever W which is provided
with a quadrant and thumb nut to enable it to be held in any required position.
Thus when the lever W is placed in its most forward position the whole of the
heated air and the products of combustion from the firebox pass through the
tubes Q, the flue T being closed and when the lever W is placed in its most
backward position the whole of the heated air and the products of combustion
from the firebox pass through the flue T, the tubes Q being closed, and if the
outlets regulated by the valve U are equal in area respectively to the area of the
tubes and the flue T, it follows that by the altering of the position of the
lever W, the heated air and the products of combustion from the firebox can be
conveyed in varying ratio through the tubes Q and the flue T at the same time.
X is the pipe conveying the exhaust steam from the cylinder of the engine to
the chimney S. Y is a pipe conveying the steam from the safety valve to the
chimney S. Z is a hinged ashpan for closing in the bottom of the firebox
when the engine is standing still.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:-
1. In connection with steam engines. A flue or flues provided with a regulating
valve or valves, passing outside the boiler, that can convey the heated air and
the products of combustion from the firebox to the chimney without imparting
heat to the boiler substantially as described.
2. In connection with steam engines. A flue or flues provided with a regulating
valve or valves, passing through the boiler, that can convey the heated air and
the products of combustion from the firebox to the chimney imparting a reduced
heat to the boiler substantially as described.
3. A valve or valves arranged so as to regulate the current of heated air and
the products of combustion so as to convey them to heat the boiler or to pass them
through a flue or flues so that they only partly or not at all heat the boiler sub-
stantially as described.
D
JOHN ERNEST WALLIS,
WALLIS & STEEVENS LIMITED,
WILLIAM ALFRED WALLIS,
FRANCIS ASHBY WALLIS,
Directors.
JOHN ERNEST WALLIS,
Secretary for the Company.
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1033.
JOHN ERNEST WALLIS,
WALLIS & STEEVENS LIMITED,
WILLIAM ALFRED WALLIS,
FRANCIS ASHBY WALLIS,
Directors.
JOHN ERNEST WALLIS,
Secretary for the Company.