Year: 1892

page_text: с
when closed cover the openings a, and the catch r, having an opening c which
fits on to the fastening on the rod E' when the door is closed, and which is
secured against the fastening 9 by a screw d screwed into the latter and entering
the opening c.
On the vertical sides n of the door are formed grooves into which is slid a glass
or mica pane S, curved in a corresponding manner to the door P.
The water level in the gauge glass N is readily visible through the spaces
between the oblique openings o and the glass or mica pane; but in order to
facilitate the reading of the water level, there is placed behind the gauge glass N,
that is to say, at the back of the metal casing, a plate O having one or more
rows of regular perforations w¹, so that as those of such perforations that are
situated behind the water contained in the glass are distorted by the refracting
action of the water, so as to appear to lie in a different direction from the real
position as indicated at Fig. 2, the height at which the water stands in the glass
will be readily discernable from a distance.
Fig. 7 shews a detached view of the plate O with oblique perforations or slots of
the safety appliance shewn in Figs. 1 to 6.
Fig. 8 shews a similar plate O with several rows of diamond shaped per-
forations.
In the event of the fracture of the gauge glass, the steam and water can escape
backwards through the perforations w¹.
consist
Behind the protective casing may be arranged a reflector U, which may
of an enamelled or white lacquered metal plate which is provided at its ends with
lugs V having pivots V' which fit into corresponding holes in the rings H, so that
the reflector can be turned into any desired direction upon its pivots for causing the
rays of light falling upon it to be properly reflected on to the gauge glass.
Fig. 9 shews a detached view of the reflector.
Figs. 10, 11 and 12 shew a protective appliance the metal casing of which is
partially closed behind, the plate O with perforations w¹ being the same as before
described, as is also the reflector U, whose pivots V₁ fit into holes X in the lugs C C¹
of the metal casing.
In the back view at Fig. 11 the reflector is omitted. The two metal pieces A A¹
of the back side of this arrangement bave larger openings u, t, t¹ which allow of. the
passage of the light from the back.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In protective appliance for water level indicators, the application behind
the gauge glass of a plate O having regular perforations w₁ of any form, to which
the light has access from behind, and which facilitates the reading off of the
waterlevel by the fact that those perforations that are situated behind the water in
the glass appear distorted when viewed through the glass from the front, sub-
stantially as described.
2. In a protective appliance for waterlevel indicators, such as is referred to in
the first claim, the use of an adjustable reflector U placed behind the perforated
plate O, substantially as described.
3. A protective appliance for waterlevel indicators such as is referred to in
the first claim, wherein the plate provided with regular perforations is arranged
at the back of a metal casing formed of several parts and open behind, the
front of such casing being formed by a door having inclined openings behind
which is a glass or mica pane, so that the water level can be observed through
such openings and glass or mica pane, the latter serving to protect the fireman
from the escape of steam and water in the event of the gauge glass breaking,
while the metal door protects the gauge glass from injury, substantially as
described.
4. In a protective appliance for water level, indicators such as is referred to

page_text: in the preceding claim, a metal casing consisting of two rods E E' which are fitted
rotatably into eyes I of rings H having openings a in front which permit of the
appliance being fitted on to the gauge glass, a door P connected to rod E and
having oblique openings and provided with a pane of glass or mica such door being
provided with projections that cover the openings a of the rings and with a
suitable closing device whereby it can be secured to the other rod El and springs K
which press the rings against the screw nuts of the gauge glass fittings, substantially
as described.
1
T 1
1000
ABEL & IMRAY,
Agents for the Applicant..