A New or Improved Gauge Glass Protector for Boilers and such like.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
A New or Improved Gauge Glass Protector for Boilers and
such like.
I, GEORGE JOHN JABEZ MANVELL, Engine Driver, of 113 Victoria Terrace,
Littlehampton, in the County of Sussex, do hereby declare the nature of this
invention to be as follows:-
It consists in making a removable cover or protector preferably of metal in or of
two halves longitudinally so as to embrace and cover the existing gauge-glass and
also the stuffing-boxes of the gauge cocks. To said metal covers the front part has
applied to it a glass and the back part is fitted with a waste steam and water
outlet. The front half contains a clear glass window or door which may be fixed
or movable in itself and through which can be seen the gauge-glass: the back half
has one or more exits connected with a waste steam and water pipe fitted to it.
To said cover at top and bottom to make the protector steam tight I fit one or
more packing rings. The said front and back covers have faced joints and are
fitted together with thumb or other screws. The glass window or door is fixed
steam and water tight in the front part of the cover shaped to receive it. The
inside of back of cover may be painted any convenient colour or colours so as to
show up the water in the gauge.
Both front and back cover contain recesses to hold packing rings when brought
together to embrace the stuffing-boxes of the gauge glass cocks.
Dated this 1st day of June 1896.
HERBERT HADDAN & Co.,
Agents to the Applicant.
COMPLETE SPECIFICATION.
A New or Improved Gauge Glass Protector for Boilers and
such like.
I, GEORGE JOHN JABEZ MANVELL, Engine Driver, of 113 Victoria Terrace,
Littlehampton, in the County of Sussex 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:-
This invention relates to a gauge glass protector for boilers and such like, that
is to say a removable cover to form a chamber to contain the gauge glass so as to
protect the latter from injury from external sources and also to prevent injury to
the engineer or others and to prevent direct escape of steam or water into the stoke
hole or equivalent place in the event of the gauge glass bursting.
According to this invention the protector is suitably fitted or packed to form a
closed chamber about the gauge glass and an outlet is provided and fitted with an
escape pipe or connected to any existing escape or drain pipe to carry off any
steam, or water that may enter the chamber, so that the latter may not interfere

page_text: with the movements of the engineer or other person in closing the cocks of the
gange glass.
The annexed drawing illustrates a gauge glass protector constructed to fulfil the
above objects.
Fig. 1 is a front elevation of a gauge glass with its ordinary fittings and
showing the protector fitted thereon.
Fig. 2 is a side elevation and Fig. 3 is a horizontal section illustrating the same
parts.
A represents the gauge glass, B and C are the sockets holding the said gauge
glass, and D E are the cocks thereof. Such sockets have usually cylindrical or
similar parts be about which the protector may
be fitted to form a close joint,
usually with insertion of a packing ring as at b' c.
F is the protector which surrounds and encloses the gauge glass A. It is
preferably made in two parts F1 F2 having flanges ffl to be connected together
by bolts f2 and thumb nuts f3 or in any other convenient manner so that it may
be removable without difficulty for the replacement of a broken gauge glass.
f4 represents a packing strip between the flanges f, f.
In place of two flanges, the parts F F 2 may have a hinge or other connection
along one side and be connected by bolts or the like or the other. The front part
of the protector is provided with an opening in which glass of sufficient strength is
inserted as at G; this may be retained in place for instance between an exterior
plate G and an interior plate G 2. The latter may be reinforced at G 3.
In the construction illustrated the outlet of the protector is provided in the
middle of the back part, as at H, but it may be at any other place, for instance it
may be a passage through the metal of one of the sockets B, C. It may be covered
with a wire gauze or with a grating to prevent it being closed by a portion of the
broken gauge glass lying thereover.
I do not confine myself to the construction here shown but may vary the same
within the spirit of this invention and in order that the operation of the invention
may remain substantially the same.
Should the gauge glass break, the chamber F will be filled with steam or water
or both which will escape by the vent H and be carried off by the pipe leading
therefrom on observing the occurrence the engineer will close the cocks D, E, so
that no further water or steam can enter the chamber F. The pressure in the
latter having rapidly become equal to the exterior atmospheric pressure, the
vent H being open, the protector may now be opened and wholly or partially
removed in order to replace the broken gauge glass with a new one. The protector
may then be replaced and the cocks D, E, opened. The inside of the protector
may be coloured in any way to show up more clearly the level of the water in the
gauge glass.
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. A gauge glass protector consisting of a closed chamber enclosing the gauge
glass and having means for the outlet of steam or water from said chamber.
2. A gauge glass protector consisting of a closed chamber enclosing the gauge
glass and having means for equalizing the pressure in said chamber with the
external atmospheric pressure.
3. A gauge glass protector consisting of a closed chamber enclosing the gauge
glass having a vent to said chamber and a pipe leading from said vent for the
purpose set forth.
4. A gauge glass protector in two parts adapted to be closed around the gauge
glass and about the sockets holding the same, to form a closed chamber about said
gauge glass.
5. A gauge glass protector consisting of a front part having a window therein
and a back part, these parts having faced joints for attachment by bolts and nuts

page_text: or equivalent fastenings, and having end packings to fit upon the gauge glass
holding sockets.
6. A gauge glass protector consisting of a front part having a window therein,
a back part, these parts having faced joints, bolts and nuts or equivalent fasteners
for securing said joints, end packings to fit upon the gauge glass holding sockets, a
vent to said protector, and a pipe leading from said vent for the purpose and
substantially according to the manner hereinbefore set forth.
Dated this 1st day of March 1897.
HERBERT HADDAN & Co.,
18, Buckingham Street, Strand, London, Agents to Applicant.