IMPROVEMENTS
Year: 1881

page_text: PROVISIONAL SPECIFICATION left by the said William Arnold at the Office
of the Commissioners of Patents on the 24th March 1881.
WILLIAM ARNOLD, of Barnsley, in the County of York.
BOILERS."
"IMPROVEMENTS IN
My Invention relates to the arrangement of water tubes or generators in the
flues of steam boilers, whereby a greater amount of heating surface and better
circulation is obtained. In carrying out my Invention I adopt mainly the following
arrangements:-I place one or more water tubes or generators longitudinally
within the flue of such boilers, preferably at an angle with the horizontal line of
boiler, and inclining upwards towards the front end of boiler, such tubes or gene-
rators communicating near the furnace end of boiler by an opening or openings
with the upper part of boiler flue, and at the other end by similar openings
with the underside of flue. These generators or water tubes may continue
the whole length of the boiler, but by preference stop short at or near the bridge.
The flame or gas striking against the end of generator which acts as a baffle-plate
is distributed and envelopes the generator, and passing between that and the
surface of the flue heats both, and thus avoids any dead surface as in the ordinary
flue boiler.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Arnold in the Great Seal Patent Office on the
24th September 1881.
WILLIAM ARNOLD, of Barnsley, in the County of York.
BOILERS."
"IMPROVEMENTS IN
My Invention relates to the arrangement of water tubes or generators in the
flues of steam boilers, whereby a greater amount of heating surface and better
circulation is obtained. In carrying out my Invention I place one or more water
-tubes or generators longitudinally within the flue of such boiler, placed at an angle
with the horizontal line of boiler, and preferably inclining upwards towards the
front end of boiler, such tubes or generators communicating near the furnace end
of boiler by an opening or openings with the upper part of boiler flue, and at the
other end by similar openings with the underside of flue. These generators or
water tubes may continue the whole length of the boiler, but by preference stop
short at or near the bridge.
In order that this Invention may be better understood, I herein give reference to
the accompanying Sheet of Drawings illustrative thereof, wherein Fig. 1 is a longi-
tudinal section of a double flued steam boiler, and Fig. 2 is a cross section of same.
A is the boiler having one or two flues B therein in the usual manner, and C is the
additional water tube or generator communicating with the upper and lower part
of the boiler by means of branch connections D and E. It will be seen that the
'additional water tube C is placed at an angle within the flue, so as to obtain good
circulation, which could not be obtained if the water tube was placed horizontally
with the flue and boiler. By this arrangement the flame and beated gasses from the
fire cannot pass through the flue in a body as in an ordinary boiler, but they will
impinge and break against the end of the water tube and distribute the heat
passing along the top and bottom surfaces of both flue and tube, thereby giving an
effective amount of heating surface, and producing as far as possible perfect
circulation, consequently reducing the unequal expansion and contraction to a
minimum.
In some cases I employ two water tubes or generators C, as shewn in Figure 3.
Having now shewn and described the nature and particulars of my Invention I
would have it understood that I do not confine myself to the direction in which
the water tube leans, nor to its size or exact position, as it may be varied to suit
circumstances, but what I consider to be new and therefore claim as my Invention
.is,
The use and employment of the water tube or generator C placed at an angle
within the flue B for the purpose, substantially as shewn and described.
In witness whereof, I, the said William- Arnold, have hereto set my hand
and seal, this Twenty fourth day of August, in the year of our Lord One
thousand eight hundred and eighty one.