An Apparatus for Indicating the Proportion of Air contained in the Waste Gases escaping from a Boiler Furnace or other Furnace.
Year: 1897

page_text: Date of Application, 8th July, 1897
Complete Specification Left, 9th Apr., 1898-Accepted, 14th May, 1898
PROVISIONAL SPECIFICATION.
An Apparatus for Indicating the Proportion of Air contained in the
Waste Gases escaping from a Boiler Furnace or other Furnace.
I, CHARLES DAY, of 2, Parkfield Avenue, Bowling Park, Bradford, in the County
of York, Mechanical Engineer, do hereby declare the nature of this invention to
be as follows:
My invention relates to an apparatus for indicating the proportion of air con-
tained in the waste gases escaping from a boiler furnace or other furnace, my
object being to indicate the extent to which air forms a part of the waste gases in
order to ascertain the efficiency of the furnace so far as it can be determined by
the quantity of air used.
The apparatus I employ consists of a spherical or other suitably shaped casing in
communication by means of pipes or passages with the flue through which the
furnace gases are flowing and also with an aspirator or other suitable appliance
for inducing a small portion of the furnace gases to flow through the casing.
Inside the casing is a float such as a ball or flask suspended from a balance beam
so adjusted that the pointer indicates zero on the scale when the float is surrounded
by air. Furnace gases have a greater specific gravity. than air at the same
temperature and pressure hence when the float is surrounded by such gases it will
rise and the pointer on the balance scale will occupy a corresponding position other
than zero and by calculation or calibration the apparatus can be made to indicate
the proportion of air in the gases.
The chief advantages of the apparatus are that the cubic space around the float
and inside the casing can be reduced to a small amount in comparison with the
cubic displacement of the float itself so that a large float may be used without the
space for gas being correspondingly large and secondly the differences of weight
to be detected by the balance are proportional to the cubic displacement of the
float hence a balance of ordinary sensitiveness can be employed with a large float
and without necessitating a large gas space.
The pressure of the gas around the flask is kept practically uniform by suitable
governing apparatus without the admission of outside air, nothing but the flue
gas being admitted to the apparatus.
712 1
11007
H. B. BARLOW & GILLETT,
Agents for Applicant

page_text: An Apparatus for Indicating the Proportion of Air contained in the
Waste Gases escaping from a Boiler Furnace or other Furnace.
I, CHARLES DAY, of 2, Parkfield Avenue, Bowling Park, Bradford, in the County
of York, Mechanical Engineer, do hereby declare the nature of this invention and
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:
-
i
My invention relates to an apparatus for indicating the proportion of air con-
tained in the waste gases escaping from a boiler furnace or other furnace, my
object being to indicate the extent to which air forms a part of the waste gases in
order to ascertain the efficiency of the furnace so far as it can be determined by
the quantity of air used.
The apparatus I employ consists of a spherical or other suitably shaped casing in
communication by means of pipes or passages with the flue through which the
furnace gases are flowing and also with an aspirator or other suitable appliance
for inducing a small proportion of the furnace gases to flow through the casing.
In the accompanying sheet of drawings
Figure 1 is a sectional elevation and Figure 2 an elevation of an apparatus
made according to my invention.
In these views, C designates the spherical casing, F the ball or float and E the
balance beam from which it is suspended, A, A, are inlets to the space between
the float and the casing, the inlets being connected by pipes or passages to, the
flue through which the furnace gases are flowing, B, B, are outlets from the casing,
the outlets being connected with some suitable appliance for causing a portion
of the furnace gases to flow through the space around the float F.
When the float F is surrounded by air the balance beam E is so adjusted that the
pointer indicates zero on the scale. Furnace gases have a greater specific gravity
than air at the same temperature and pressure, hence when the float is surrounded
by such gases it will rise and the pointer on the balance scale will occupy a
corresponding position other than zero, and by calculation or calibration the
apparatus can be made to indicate the proportion of air in the furnace gases.
The chief advantages of the apparatus are that the cubic space around the float F
and inside the casing C can be reduced to a small amount in comparison with the
cubic displacement of the float F itself so that a large float may be used without
the space for gas being correspondingly large. Secondly the differences of weight
to be detected by the balance are proportional to the cubic displacement of the
float hence a balance of ordinary sensitiveness can be employed with a large float
and without necessitating a large gas space: This renders the apparatus suitable
for the conditions which usually prevail in boiler houses and such places.
Thirdly the arrangement of the inlets and outlets enable a strong current of
the furnace gases to be passed through the apparatus without the force of the
currents affecting the balance.
Fourthly the small gas space around the float minimizes the lag between the
registration on the scale and the corresponding condition of the gases.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. In combination a suitable casing and a float such as F suspended from the
balance beam E, suitable inlets and outlets for the furnace gases from the flue to

page_text: the space between the float and casing and an aspirator or equivalent for causing
a. current of gases to flow through said space all substantially as and for the purposes
herein set forth.
2. The general arrangement and combination of parts substantially as herein
described with reference to the drawings constituting an apparatus for indicating
the proportion of air contained in the waste gases escaping from a furnace.
3000
Dateu
GIMS To day op
H. B. BARLOW & GILLETT,
Agents for Applicant, 17, St. Ann's Square, Manchester.