Year: 1886

page_text: I JOHN DEWRANCE of 158 Great Dover Street Lambeth in the county of
Surrey Engineer do hereby declare the nature of this invention to be as follows:-
The object of this invention is the construction of a Water Gauge, having two
glass tubes but only one connection to the boiler for each arm.
There is a threeway cock in each arm by preference "Asbestos Packed" capable
of opening communication from the boiler to either glass tube or both at once, and
shutting off both at once.
The glasses are arranged on either side of this cock and as close together as
possible so that the Water Gauge occupies but little more space than an
ordinary one.
To prevent the fragments from one tube in case of breakage striking the other
and breaking it I provide a strip of steel cut to the proper length, the ends being
shaped in such a way that it can be sprung into suitable notches in the top and
bottom arms.
In order that the passages may be cleared readily, I provide a hole right through
the head of the plug of the cock, with a suitable cap which can be removed when
it is desired to clear the passage into the boiler.
Suitable plugs may also be provided for clearing the cross passages from the
plug of the cock to the glass tubes.

page_text: I JOHN DEWRANCE, of 158 Great Dover Street Lambeth in the county of
Surrey, 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 :-.
The object of this invention is the construction of a water gauge having two
glass tubes, but only one connection to the boiler for each arm.
There is a threeway cock in each arm, by preference asbestos packed, capable
of opening communication from the boiler to either glass tube, or both at once, and
shutting off both at once.
The glasses are arranged on either side of this cock, and as close together as
possible, so that the water gauge occupies but little more space than an
ordinary one.
To prevent the fragments from one tube, in case of breakage, striking the other
and breaking it, I provide a strip of steel cut to the proper length the ends being
shaped in such a way that it can be sprung into suitable notches in the top and
bottom arms.
In order that the passages may be cleared readily, I provide a hole right through
the head of the plug of the cock, with a suitable cap, which can be removed when
it is desired to clear the passage into the boiler, Suitable plugs may also be
provided for clearing the cross passages from the plug of the cock to the glass
tubes.
On the accompanying sheet of drawings Fig. 1. is the top arm of the Water
Gauge. Fig. 2 is the bottom arm, and Fig. 3 is a section through the plug of the
cock lengthwise, a is the body, 6 is the plug which opens communication from the
boiler to either or both of the glass tubes. Fig. 1 shows the plug in the position
for connecting the left side glass tube, and Fig. 2 shows the position of plug when
open to both glass tubes; c is the strip of metal by preference nickel plated steel,
to prevent the fragments from one tube, in case of breakage, striking the other and
breaking it, the ends being curved it is sprung into the grooves as shown. dis
the cap on the end of the plug b, which is removed for clearing the passage into
the boiler.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
Firstly. The duplex water gauge with a cock by which a passage can be opened
or closed from the boiler to either or both gauge glasses, substantially as described.
Secondly. The arrangement by which the passage into the boiler can be cleared
by a rod by taking off the cap.
Thirdly. The use of, and method of using a dividing plate between the glasses.
Dated this 15th day of November 1886.