IMPROVEMENTS IN WATER GAUGES.
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by the said John Dewrance at the
Office of the Commissioners of Patents on the 1st February 1883.
JOHN DEWRANCE of 158 Great Dover Street Lambeth in the County of Surrey
IMPROVEMENTS IN WATER GAUGES.
This invention has for its object certain improvements in Water Gauges by
which the evils consequent on the breakage of the glass are very much reduced.
Into the lower arm of the Water Gauge a blow through cock is usually screwed.
On the end of the screw of this cock I form two projections which support a ring.
This ring forms the guide for a valve, which it supports at a little distance
from a seating formed at the lower end of the hole, that communicates with the
glass, so that when the glass breaks the valve is forced up against the seating &
shuts off the escape of water. If more convenient both the valve support & seating,
may be screwed into the body of the lower arm of the Water Gauge from above,
& forms the bottom of the cavity for the glass & packing ring.
In the upper arm of the Water Gauge immediately above the glass I form a
seating into which is fitted a valve plug, a hole is drilled through this plug large
enough to allow sufficient steam to pass to clean the glass & give indication of the
height of the water, but not enough to cause inconvenience if the glass breaks.
When the glass is required to be renewed, this plug is lifted out & for this reason
has a handle by which it can be taken hold of when the cap is removed. The
projections in the lower arm & the handle of the valve plug in the upper arm
are made so as to allow; the passages into the boiler to be cleared with a rod
through the usual clearing screw hole in the ordinary way. By preference I retain
the three cocks as usual.
The automatic valve in the lower arm being as far as possible from the boiler
& just under the glass is not likely to become corroded as the sediment
accumulates in the enlarged passages of the blow through cock.
When clearing the passage of the lower arm, the valve can be lifted by the rod
to ascertain if it is in proper working condition.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Dewrance in the Great Seal Patent Office on the
27th July 1883.
JOHN DEWRANCE of 158 Great Dover Street Lambeth in the County of Surrey
Engineer "IMPROVEMENTS IN WATER GUAGES."
This invention has for its object certain improvements in Water guages by
which the evils consequent on the breaking of the glass are very much reduced.
Into the lower arm of the water Guage a blow through Cock is usually screwed―
On the end of the screw of this cock I form two projections which support a ring-
This ring forms the guide for a valve which it supports at a little distance from a
seating formed at the lower end of the hole that communicates with the glass so
that when the glass breaks the valve is forced up against the seating and shuts off
the escape of water-If more convenient both the valve support and seating may
be screwed into the body of the lower arm of the water guage from above and
form the bottom of the cavity for the glass and packing ring
In the upper arm of the water guage immediately above the glass I form a
seating into which is fitted a valve plug and a hole is drilled through this plug
large enough to allow sufficient steam to pass to clean the glass and give indication
of the height of the water but not enough to cause inconvenience if the glass
breaks When the glass is required to be renewed this plug is lifted out and for
this reason has a handle by which it can be taken hold of when the cap is
removed. The projections in the lower arm and the handle of the valve plug in
the upper arm are made so as to allow the passages into the boiler to be cleared
with a rod through the usual clearing screwhole, in the ordinary way-By
preference I retain the three cocks as usual.
The automatic valve in the lower arm being as far as possible from the boiler
and just under the glass is not likely to become corroded as the sediment
accumulates in the enlarged passages of the blow-through cock
When clearing the passage of the lower arın the valve can be lifted by the
rod to ascertain if it is in proper working condition
Fig. 1 is a side view in section and Fig: 2 is a front view in section of
the water guage-a, is the shell or body=b is the screw which secures
the
bottom cock to it :-c c are the projections which meet and form a ring supporting
the automatic valve d; e is the passage connecting the glass with the Boiler
which can be cleared by a rod introduced at the clearing screw f in the
usual way.
In the top arm of the water guage g shews the valve plug resting on a
seating which has a small taper hole through it which gives sufficient steam
to clean the glass and to establish the required equilibrium, but not enough to
cause trouble in case the glass breaks-This plug has a handle k by which it
can be taken out when putting in a new glass.
Fig: 3 shews a method of screwing the projections into the screw of the
bottom cock.
What I claim as my invention is:—
First. The arrangement of automatic shut off valve as applied to water-
guages substantially as described
Secondly the method of supporting the automatic valve on projections on
the screw of the bottom cock arranged in such a way that the passages to the
boiler can be cleared by a rod introduced through the clearing screw in the
usual way.

page_text: Thirdly. the arrangement of removable valveplug in the top arm which
prevents the escape of a large quantity of steam in case the glass breaks, but
does not interfere with the cleaning of the passage into the boiler.
In witness whereof J the said John Dewrance have hereunto set my hand and
seal this twenty sixth day of July in the year of our Lord 1883.
TOON NEWDA NOR