Improvements relating to Mercury and like Pressure Gauges.
Year: 1897

page_text: Date of Application, 10th June, 1897
Date of Application, 10th Mar., 1898--Accepted, 23rd Apr., 1898
PROVISIONAL SPECIFICATION.
Improvements relating to Mercury and like Pressure Gauges.
We, RICHARD THOMAS GLOVER and JOHN GEORGE GLOVER, of the Firm Thomas
Glover and Company Limited, 214 to 222, St. John Street, Clerkenwell, London,
Gas Meter Manufacturers, do hereby declare the nature of this invention to be
as follows:-
This invention relates to mercury and like gauges from which the greatest
accuracy of pressure can be ascertained and made visible upon a vernier or
scale.
For the purpose of this invention as applied for indicating the pressure of gas,
it consists of bellows or expansible appliance into which gas can be admitted
and above or below which but in contact with or through the intermediation
of one or more levers acting upon or against a flexible or compressible bag con-
taining mercury or other heavy fluid will cause the fluid to rise up the open top gauge
tube connected to the bag to a height proportionate to the pressure.
The apparatus is subject to several modified arrangements according to the
formation of the scale and position and uses for which it is intended.
As an example of the applications of this invention a mercury tube ten inches
high can have a scale made to represent an inch of pressure for its full length
and this by sub-division can be marked off in hundredths or in any other order
so that positive readings of actual pressures can be indicated.
The gas inflated appliance can be of any dimensions or capacity and the
mercury bag comparatively small thereto or otherwise as found convenient.
Data the 10th day of Tuna 1907
Improvements relating to Mercury and like Pressure Gauges.
We, RICHARD THOMAS GLOVER and JOHN GEORGE GLOVER, of the Firm Thomas
Glover and Company, Limited, 214 to 222, St. John Street, Clerkenwell, London,
Gas Meter Manufacturers, do hereby declare the nature of this invention and in
what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement: -
This invention relates to mercury and like gauges from which the greatest

page_text: accuracy of pressure can be ascertained and made visible upon a vernier or
scale.
For the purpose of this invention as applied for indicating the pressure of gas,
it consists of bellows or expansible appliance into which gas can be admitted
and above or below which but in direct contact with, or through the intermediation
of one or more levers acting upon or against a flexible or compressible bag con-
taining mercury or other fluid, will cause the fluid to rise up the open top gauge
tube connected to the bag to a height proportionate to the pressure.
The apparatus is subject to several modified arrangements according to the
formation of the scale and position and uses for which it is intended.
As an example of the applications of this invention, a mercury or fluid tube
can have a scale made to any height to represent, say, an inch of pressure for
its full length, and this by sub-division can be marked off in hundredths, or in
any other order so that positive readings of actual pressures can be indicated.
The gas inflated appliance can be of any dimensions or capacity, and the
mercury or fluid bag comparatively small thereto, or otherwise, as found conve-
nient, and according to the surface area of the pressure bellows so the mercury
or other fluid can be lifted to. the desired height and consequently the markings
on the scale will be determined for given pressures.
The invention will be more particularly understood by reference to the examples
represented on the annexed drawings.
7
Figure 1 part sectional elevation of the lever arrangement.
Figure 2 part sectional elevation of a modified arrangement showing direct
up thrust of pressure bellows for regulating and indicating the gas pressure.
According to the view, Figure 1, A. is the base of the apparatus, B shield,
C cap, D ferrule, enclosing between them a flexible bag D¹ containing the mercury
or other fluid which has to rise up the glass tube E to a height in proportion
to the pressure of the button F, this being in touch with the bottom of the bag D'
and on the free end G of the lever H pivotted at I in balance with that of the
bottom plate J of the pressure bellows K, the upper plate of which is secured
to the underside of the shield B and having the gas supply pipe L affixed either
direct or by a short flexible piece of tubing. The bottom plate J of the pressure
bellows K lodges on a pivot pin M of the lever H to ensure the direct up and
down movement of the bottom plate J for uniform action of the bellows when
expanded by gas pressure.
In the drawing, we show the upper half of the bag as part of the vertical glass
tube support or cap C, the bottom alone constituting the flexible portion, each of
these has a flange, of which the flexible flange serves as a packing to make the
tube and bag liquid tight when put into close contact by the screwing up of the
ferrule D.
The vertical tube E is shown provided with a bulb N at the upper part and
closed by a cap P to prevent dust entering, but a pinhole can be formed in the
cap if so desired to constitute a protected open end. Q is a double marked
vernier or scale, the full length of which from a to b would represent, say, an
inch of rise, the full divisions representing tenths and the subdivisions hundredths 4
thereof to enable the scale to be readily visible and indicated to the greatest
nicety according to the pressure of gas exerted upon or within the bellows K.
Figure 2 is a modification in so far as the pressure bellows is concerned. In
this figure, the upper plate J1 has a central rise on it for contact with central
portion of the fluid bag D₁ and ensure action on all the fluid in the lower portion
of the bag, the gas entry being from below, as indicated.
Figures 3 and 4 also show a modification and in which a double bellows, or what
may be termed, a single bellows K for gas pressure as before, and a compensating
or air balance bellows K' is employed, the air being drawn in from a tap R when
in one position into an uprising pipe S, said tap having a three way passage in 5
order that when the plug is turned into the other position, the passage is open

page_text: to the bend T of the pipe S to exert a balance pressure on the fluid in gauge
tube E, the bend being attached to the upper part of the return leg U of the
gauge tube E, as represented.
Figures 1 and 2 otherwise correspond to the modification shown at Figures 3
and 4, except that the scale is marked zero at the bottom to read upwardly only,
while at Figures 3 and 4 the zero is at the middle of the scale for double sight
reading in a manner known.
According to this invention, as the surface area of the bellows is increased, the
pressure on the other bellows or fluid bag is proportionately greater, consequently
the mercury or other fluid can be lifted to a greater height against the atmosphere
and thus make the reading much more multiplied, so that a pressure of, say,
1 inch may be made to lift the fluid to 20 inches by simply enlarging the surface
area of the primary bellows.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we declare that what we
claim is:
1. In fluid pressure gauges of the kind described, increasing the surface area of
the pressure bellows so that it acts with more force on the supplementary bellows
or fluid container or lever to lift the gauging fluid to a greater height and thus
allow the pressure of gas to be represented on a gauge in a height of 10 or 20 or
more inches for each inch of pressure according to the surface area of the pressure
bellows and length of gauge glass, as described.
2. The herein before described improvements in or relating to gauges for
prominently and visibly indicating gas pressure in divisions and subdivisions of
inches by pressure imparted to flexible bags by or from bellows or internally
expansible bodies as set forth and substantially as represented on the annexed
drawings.
3. The particular arrangement of appliances operable by and from an internal
expansible body due to gas pressure for action on the flexible portion of a fluid
containing bag for forcing fluid 'up a gauge glass and thereby enabling the
pressure to be indicated and be read from a divided and subdivided scale of great
length in proportions of tenths and hundredths, as described and shown on the
annexed drawings.
4. The modified arrangement having a second or air balancing bellows, as
represented at Figures 3 and 4 of the drawings for the purpose specified.
pressure
5. A gas pressure indicating apparatus consisting of the combination of a
gas pressure actioned bellows with a fluid gauge for indicating the
the bellows acting directly or indirectly upon the column of fluid, as and for the
purpose set forth.
AK TUDO
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said Richard Thomas Glover and
John George Glover.