An Improved Portable Instrument for Automatically Recording the Pressure of Gas.
Year: 1889

page_text: Date of Application, 10th Sept., 1889
Complete Specification Left, 4th June, 1890-Accepted, 12th July, 1890
PROVISIONAL SPECIFICATION.
An Improved Portable Instrument for Automatically Recording the
Pressure of Gas.
We WILLIAM REGINALD CHESTER, The Woodlands, Mapperley, Nottingham, Gas
Engineer, and JAMES SELBY, 27 Pelham Street, Nottingham, Optician, do hereby
declare the nature of this invention to be as follows:-
Each instrument consists of an outer vessel containing a bell or float constructed
in the usual manner, the outer vessel is provided with a watertight cover and a rod
carrying the marking mechanism attached to the bell or float passing through a
stuffing box in the cover. A cylinder containing the driving clock round which is
fixed the paper for a diagram being carried on the cover, the stuffing box contains an
elastic packing, clear of the rod while the instrument is recording the pressure of the
gas, the packing being compressed round the rod to form a watertight joint by
screwing down the upper gland of the stuffing box when it is desirable to make the
instrument portable, it may then be carried about in any position without being
deranged.
When instruments for recording the pressure of gas are provided with a watertight
cover and a stuffing box in which the packing can be compressed round the rod
carrying the marking mechanism, to make a watertight joint, the necessity for pouring
out the water from the instrument and refilling it when removed from one place to
another is avoided.
1000
H. W. GOUGH, C.E.,
Agent.
COMPLETE SPECIFICATION.
An Improved Portable Instrument for Automatically Recording the
Pressure of Gas.
We WILLIAM REGINALD CHESTER, The Woodlands Mapperley Nottingham Gas
Engineer and JAMES SELBY 27 Pelham Street Nottingham Optician 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 :-
Figure 1 is a side view of a recording instrument having one side of a wood cover
removed, showing an outer vessel in section containing a float.
Figure 2.shows a plan of the instrument with the wood lids of the cover removed..
Figure 3 a sectional view of a stuffing box with the packing compressed round a
rod, and
Figure 4 a sectional view of the stuffing box with its upper gland unscrewed,
showing the packing expanded to clear the rod when the instrument is in use.
Each instrument consists of an outer vessel A for containing water, and open only
at the top which is turned inwards to form a flange A¹ on each side, upon which 'a
washer of india rubber A' is placed "see Figure 1," above the washer is a covering
plate A³ having a hole near each corner through which screw threaded studs A pass,
which project from the flange of the outer vessel. Each stud is provided with a nut,
the screwing down of which compresses the washer A² between the covering plate
and the flange of the vessel A and forms a water tight joint.
At a short distance from one of the studs the cover is perforated to allow of the
free movement of a tube B within it, round the perforation the cover plate is provided
with an exterior screw threaded projection forming the lower gland of a stuffing

page_text: box A containing an elastic india rubber ring A6 " see Figures 3 and 4" forming a
packing which may be compressed round the rod by screwing down the upper
gland A' of the stuffing box as shown at Figure 3 when it is desirable to make the
instrument portable, it may then be carried about without being deranged. When in
use the upper gland A' is unscrewed to allow the packing to expand and clear the
rod as shown at Figure 4.
Within the outer vessel is a bell or float B' open at its lower end and provided with
a cylindrical air vessel B2 constructed in the usual manner, within one corner of the
bell or float B¹ a tube B3 is secured extending from the top to the bottom. The tube
is free to move up or down on a guide rod B₁ the lower end of which is secured in
the bottom of the vessel A.
The two vessels, tube, and guide rod are shown by dotted lines at Figure 2.
The opposite corner of the hell or float B' is provided with a tube B the lower end
of which terminates near the bottom of the bell or float has slots cut in one side to
admit gas to the bell or float.
The gas as shown by the arrows at Figure 1 is admitted to the recording instrument
through the inlet shown by dotted lines at Figure 1 from which it passes down a
tube through a short tube C2 connected to a small vertical tube (3 the lower end
of which is secured in the bottom of the outer vessel and terminates within the
tube B near its upper end, the tube C³ also forming a second guide rod for the float.
The upper end of the rod B carries marking mechanism D the same as described
in the specification of a former Patent granted to James Selby for Improvements in
pens employed in automatic recording instruments dated April 15th 1889 and
numbered 6451.
The covering plate A³ carries a cylinder E containing the driving clock round
which is fixed the paper F for a diagram.
The recording instrument is enclosed in a wood cover G through one side of which
an outlet tube G¹ passes communicating with the vessel A to regulate the height of
water in it, the outer end of the tube G¹ is closed with a screwed cap G².
The covering plate A³ is provided with a screwed stopper G4 which closes an
outlet orifice through which the water in the instrument inay be poured out when
necessary.
When instruments for recording the pressure of gas are provided with a watertight
cover, and stuffing box in which the packing can be compressed round the rod
carrying the marking mechanism, to make a watertight joint, the necessity for
pouring out the water from the instrument and refilling it when removed from one
place to another is avoided.
Having now particularly described and ascertained the nature of our said Inven-
tion and in what manner the same is to be performed we declare that what we
claim is :
The construction and employment of improved portable instruments for auto-
matically recording the pressure of gas substantially as described and illustrated in
the Drawings annexed.
Dated this Third day of June 1890.
Witness,
H. W. GOUGH, C.E.,
Nottingham.
WILLIAM REGINALD CHESTER.
JAMES SELBY.