Year: 1888

page_text: I, DANIEL MCDOWELL, of the Locomotive Department, Waterford Terminus,
Waterford and Central Ireland Railway, Locomotive Engineer, do hereby declare the
nature of the said invention, to be as follows
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This Invention relates to improved Blast Pipes for Locomotive Engines
The Invention consists of a Blast pipe so constructed, as hereinafter described, as to
increase the volume of steam by expansion after having done its work in the cylinders
before discharging it through the chimney
In the improved blast pipes (which may be made of various shapes or forms) the
one end thereof is of larger area than the other end thereof and an intermediate
portion of the pipe is made of an area exceeding that of the largest end, the pipe
preferably gradually increasing in area from the one end until it attains its greatest area
and then gradually diminishing in area into the other end
When the steam in the blast pipe is increased to two or more times its original
volume it is reduced in pressure in the same proportion Therefore it is dis-
charged through the mouth of the blast pipo at a very low pressure giving to
the fire a long gentle blast instead of a short puff Thus the blast is softened to
such an extent that the fuel is not forced through the tubes into the smokebox until
it is entirely consumed, resulting in a great saving in fuel Besides which, the
fire-box and the tubes are not worn to the same extent as with the usual short blast
Another and a most important advantage derived from the use of the Expansion
Blast Pipe, is that on account of the gentler blast no sparks of fire are ejected from
the chimney The back pressure on pistons is also much reduced and the engine
rendered more powerful by its use
The Invention can be applied to all existing locomotive engines at a nominal cost
Dated this 7th day of June 1888
DAY, DAVIES & HUNT,
321, High Holborn, London, WC,
Agents for the Applicant

page_text: improvements in Blast Pipes Ior Locomotive Engines
I, DANIEL MCDOWELL, of the Locomotive Department, Waterford Terminus,
Waterford and Central Ireland Railway, Locomotive Engineer, 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
This Invention relates to unprovements in or applicable to Blast Pipes for Locomotive
Engines
The Invention consists essentially of a Blast pipe so constructed as hereinafter
described as to increase the volume of steam by expansion after having done its work
in the cylinders before discharging it through the chimney
The accompanying drawings represent in Figs 1 and 2 longitudinal sections of 1
blast pipes, 3, constructed in accordance with the present Invention, but such blast
pipes may be made in various other suitable shapes or forms in which the characteristic
feature of the Invention is existent, and in accordance with which the one end, 4, of
the pipe is made of a large area than the other end, 5, thereof and an intermediate
poition, 6, of the pipe is made of an area exceeding that of the larger end, 4, the
pipe preferably grailually increasing in area from the one end until it attains its greatest
area and then gradually diminishing in area into the other end
When the volume of steam in the blast pipe is by such improved construction of
blast pipe increased to two or more times its original volume it is reduced in pressure
in the same proportion Therefore it is discharged through the mouth of the blast
pipe at very low pressure giving to the fire a long gentle blast instead of a short
puff Thus the blast is softened to such an extent that the fuel is not forced through
the tubes into the smoke box until it is entirely consumed, resulting in a great saving
in fuel
Besides which, the fire-box and the tubes are not worn to the same extent
as with the usual short blast Another and a most important advantage derived from
the use of the herein described improved expansion Blast Pipes, is that on account of
the gentler blast no sparks of fire are ejected from the chimney The back pressure
on pistons is also much reduced and the engine rendered more powerful by its use
The Invention can be applied to all-existing locomotive engines at a nominal cost
Having now particularly described and ascertained the nature of my sud
Invention and in what manner the same is to be performed, I declare that what
I claim is
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1 The hereinbefore described improvements in or applicable to the construction of
blast pipes for locomotive engines
2 The hereinbefore described system of increasing the volume of steam by expan-
sion after having done its work in the cylinders before discharging it through the
chimney by the use of blast pipes constructed in accordance with the present
improvements
Dated this 11th day of August 1888
DAY, DAVIES & HUNT,
321, High Holborn, London, Wu,
Agents for the Applicant