An Improved Pressure Gauge.
Year: 1889

page_text: Date of Application, 8th Oct., 1889
Complete Specification Left, 28th May, 1890-Accepted, 28th June, 1890
An Improved Pressure Gauge.
I, JOSEPH REED Gas Works Newport Isle of Wight Gas Engineer, do hereby declare
the nature of this invention to be as follows:-
The gauge consists of a metal cistern forming the base of the gange; & this cistern
is partially filled with water or other fluid. Into this cistern on topside a glass tube
is inserted dipping into the fluid. On one side of this cistern but above the surface
of the fluid a communication is made for the inlet of the gas; the pressure of which
acting on the surface of the fluid presses the fluid up the glass tube & so indicates
the pressure. Having only one glass tube in place of two & only one fixed joint
instead of four no expansion or contraction can injure it. It can be taken to pieces,
cleaned & refilled & set to work in a few minutes.
Dated this 21st day of November 1889.
COMPLETE SPECIFICATION.
An Improved Pressure Gauge.
I JOSEPH REED of Gas Works Newport Isle of Wight Gas Engineer, 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:
My invention relates to an improved pressure gauge, and is a combination of a
gauge glass tube, with a metal cistern, and an indicating staff behind the glass tube
to indicate the pressure.
I construct a suitable wooden frame, in which the gauge
glass tube rests. At the base of the tube is fitted a metal cistern and the said glass
tube is inserted into this cistern through an aperture at the top, and reaches down to
within a short distance of the bottom of the same. A screw nut and rubber washers
are provided, so as to form a thoroughly air tight joint, between the glass tube and
the cistern. These are so arranged, that when the screw nut is forced down it bulges
out the rubber bands, which are provided with small metal washers, one of which
bears against a shoulder formed in the cistern, and the other one bears against the
bottom of the screw nut, which is hexagonal to allow of being unscrewed by a spanner.
The top of the cistern provided with a short neck threaded internally with a screw
to receive the screw nut aforementioned. Upon one side of my cistern and near the
top of the same, I provide an opening as inlet communication for the gas. The cistern
is partially filled with water or other fluid, so as to entirely cover up, and submerge
the bottom end of the tube. Behind the glass tube, and above the cistern, is
placed the indicating staff after the ordinary manner; at the top of my tube I
place loosely a wooden plug, bored with a hole in the centre, to allow for the
entrance and exit of air to the glass tube. It will readily be understood that when
a pressure of gas is exerted through the inlet to the interior of the cistern, it will
act upon the serfice of the fluid, and force it up the glass tube, and thus indicate
the pressure exerted. The metal cistern afore inentioned is suitably screwed to the
wooden frame by two ears, and the glass tube is kept in position by a small
metal band.
In order that my invention may be more fully understood, I will now proceed.
to describe the various figures, on the annexed sheet of drawings, the like parts of
which are marked as far as possible with the like letters of reference. Fig. 1 is an
elevation of my improved pressure gauge. Fig. 2 is a section through the frame
Prins Bd 1

page_text: and glass gange above the level of the metal cistern. Fig. 3 is chiefly a section
of the metal cistern into which the glass tube is inserted. This section is taken
vertically through the said cistern at the middle of the glass tube, and looking
towards the indicating staff. To show the upper portion of the glass tube, I have
made broken lines, across the length of the same. In fig. 1A is the wooden frame,
B the glass tube, and C the metal cistern containing the fluid. In fig. 2 A is the
wooden frame and B again the glass tube, and D shows the indicating staff at the
back of glass tube. In fig. 3 0 is the metal cistern, B the glass tube and E
the screw nut which screws down into the projecting neck of the metal cistern.
G and G are metal washers between which are compressed the rubber bands or
other elastic packing marked H, and J is the inlet for the gas. The horizontal
dotted lines at K indicate the fluid within the cistern, M shows a small perforated
plug at the top of the glass tube B. In the upper portion of this figure 1 have
shown through the transparent glass tube, the indicating lines of the staff.
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) An improved pressure gauge arranged and constructed substantially as
hereinbefore set forth in this specification, and illustrated by the accompanying
drawing.
(2) In a pressure gauge the combination of a metal cistern having an inlet for
the gas near the top and partially filled with fluid, together with, a glass tube
the end of which is submerged in the fluid, within the cistern, and an air
tight joint made between the said tube and cistern, all as hereinbefore specified, and
as illustrated by Fig. 3 in the accompanying sheet of drawings.
Dated this 28th day of May 1890.
RAYNER & CASSELL,
37, Chancery Lane, London, W.C., Agents for the Applicant.