Year: 1888

page_text: Date of Application, 30th Jan., 1888
Complete Left, 5th June, 1888
Complete Accepted, 13th July, 1888
ALFRED THOMAS, Gas Engineer West Cowes L.W. in the County of Southampton,
PHILIP THOMAS, Gas Engineer Buckingham, in the County of Buckinghamshire, do
hereby declare the nature of this invention to be as follows:-
We make the Indicator of two glass tubes, one to be used inside the other. The
outer one has a solid bottom, while the inner one is open at both ends, & slightly the
longest.
We use an upright board; or back plate, which can be made either of wood or
metal. At the lower end of this back plate we fix a small shelf which has a hole
sunk part of the way in it, to receive the solid end of the outer tube. At the top of
the back plate we fix a ring through which the outer tube is passed. The ring at top
& the hole in shelf at bottom are for the purpose of keeping the tube steady.
We also make a metal guide to stand in the bottom of the outer tube, & one to clip
the top of this tube; each of these guides have a hole in the contre through which
the inner tube is passed. This is done to keep the smaller tube in the centre of the
outer one.
To admit of the water passing freely from the inner to the outer tube, we bevel the
lower end of the inner tube.
One or any number of these Indicators can be fixed upon the back-plate, according
to requirements; but we prefer making them in pairs; by so doing one Rule acts for
two Indicators.
To use the Indicator, the foul Gas is admitted to the inner tube by means of a
portable pipe, & coming in contact with the water discolours the latter, which admits
of the level of same being easily seen through the clean water in the outer tube.
These Indicators can be made of any diameter or length.
ALFRED THOMAS.
PHILIP THOMAS.

page_text: We ALFRED THOMAS Gas Engineer West Cowes, Isle of Wight, in the County of
Southampton and PHILIP THOMAS, Gas Engineer Buckingham in the County of
Buckingham 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:-
We make the Indicator of two glass tubes; one to be used inside the other. The
outer one has a solid bottom, while the inner one is open at both ends, and is slightly
the longest.
We use an upright back-plate which can be made either of wood or metal.
At the lower end of back-plate.we fix a small shelf which has a hole.sunk part of
the way in to receive solid end of outer tube, or a ferrule may be fixed upon shelf
which answers the same purpose. At the top of back-plate we fix a ring through
which the outer tube is passed.
The ring at top and the hole in shelf or ferrule fixed upon shelf are for the purpose
of keeping the tube in its place.
We make a metal guide to stand in the bottom of the outer tube, and one to clip
the top of the said tube. Each of these guides have a hole in the centre through
which the inner tube is passed, this is done to keep the inner tube in the centre of the
outer one or the solid end of outer tube can be made dome-shaped; and the open
end can be brought into a smaller diameter and so dispense with the two last named
guides, as this alteration to the outer tube will keep the inner tube in the centre.
To admit of the water passing freely from the inner to the outer tube the lower end
is bevelled.
One, or any number of the Indicators can be placed upon the backplate as may be
desired. We prefer making them in pairs and so make one rule answer for two
Indicators.
To use the Indicator the gas is passed by means of a portable pipe into the inner-
tube and coming in contact with the water, displaces part of the same, driving it into
the outer one; the difference between the two water levels show the amount of pressure
upon the apparatus.
These Indicators can be made of any diameter or length.
We further describe our Invention as shown upon the Plans by referring to the
letters thereon.
Fig. 1. is front view.

page_text: Having now particularly described and ascertained the nature of our said Invention
and in what manner the same is to be performed we declare that what
claim is
we
1. That we have produced a Gas Pressure Indicator which has no fixed joints, thus
doing away with all possibility of breakage through undue expansion & contraction.
2. That having no fixed joints no skilled labour is required when cleaning is
necessary.
3. That should any part of the Indicator be broken by accident such broken parts
have only to be lifted out, and replaced by new ones.
4. That as the Indicator requires no fixing, but is made to hang upon a wall it is
easily removed to other parts of a works when required.
Dated this Fourth day of June 1888.
ALFRED THOMAS.