Year: 1888

page_text: Date of Application, 18th Jan., 1888
Complete Specification Left, 18th Oct., 1888
Complete Specification Accepted, 23rd Nov., 1888
1, HENRY DEFRIES of the firm of J. Defries and Sons, of No. 147 Houndsditch, in
the City of London, Manufacturer, do hereby declare the nature of this invention to
be as follows
This invention, relates to improvements in the construction of mast head and
side lamps, or lanthorns, whereby their efficiency is secured in calm or in stormy
weather.
I hinge the top or upper lid of the lanthorn to the body in the usual manner, and
within this I make a lining with a central orifice turned up so as to present a curved
flange preventing inflow of water through this orifice into the lanthorn. Between the
lining and the hinged lid a space is left into which air is admitted by perforations
in an annular flange connecting the lining with the body of the lamp. These
perforations also serve for the escape of any water entering at the top of the
lamp.
The hinged top is preferably dome-shaped, and has a smaller dome above it provided
with an orifice in the centre. In this orifice are one or more cross bars traversed by a
vertical screw which carries at one end, above the orifice at the dome, a curved plate.
of larger diameter than the dome, so as to cover it and also project over an outer ring
between which and the dome is a passage for the introduction of air. The lower end
of the screw carries a conical or cup shaped disc, to the underside of which is attached
a similar-shaped ring, the two forming deflectors to protect the orifice in the
lining.
•
The hinged top is preferably brought down to within a short distance of the lens and
door, and the perforated flange above the lens connecting the lining of the body of the
lamp, and which forms the passage between the hinged top and the lining is preferably
inclined upwards and outwards.
-
I prefer to form flanges on the cover plate and on the rim of the outer ring which
will approximately fit when they are brought in contact.

page_text: The dome and the cup and ring carried by the screw may be raised to leave more
passage for air in fine weather, and be lowered to present less inlet for water should
the weather be stormy.
In my improved lamp the heat generated in the lanthorn will pass off through the
orifice in the lining, and the cool air entering through the perforated flange passing
upward will meet this heated air and force it through the dome and out of the lamp
by the passage between the dome and the outer ring, or between the dome and the
dome covering plate.
If a side lamp should be submerged in a heavy sea, or the rain enter the dome of a
mast head light, the conical disc and ring carried at the bottom of the screw will
deflect the water on to the lining, from which it will run off, passing through the
perforated flange; the raised edge or flange around the orifice of the lining further
preventing any inflow of water to the interior of the lanthorn.
The lanthorn may be fitted with any suitable burner and reflector, and in the case of
mast head lamps two burners may be used and double domes if desired.
TA 11
L 1
1000

page_text: L, HENRY DEFRIES of the firm of J. Defries and Sons of No. 147 Houndsditch in the
City of London, Manufacturer, 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 improvements in the construction of mast head and
side lamps, or lanterns, whereby their efficiency is secured in calm or in stormy
weather.
In order that my invention may be the better understood reference may be made to
the accompanying drawing.
I hinge the top or upper lid A of the lantern to the body C at the point B in the
usual manner, and below it, within the lantern, I make a lining D, with a central
orifice E, turned up so as to present a curved flange F preventing inflow of water
through this orifice into the body of the lantern.
Between the lining D and the hinged lid A a space G is left into which air is
admitted by perforations H in an annular flange K connecting the lining D with the
body of the lamp C. These perforations H also serve for the escape of any water
entering at the top of the lamp.
The hinged top A is preferably dome shaped, and has a smaller dome L above it
provided with an orifice M in the centre; within this smaller dome L are one or more
cross bars N traversed by a vertical screw O, which carries at one end, above the orifice
of the dome, a curved plate P, of larger diameter than the dome L, so as to cover it
and also project over an outer ring Q between which, and the dome L is a channel for
the passage of air.
The lower end of this screw O carries a conical or cup shaped disc R, to the under-
side of which is attached a similar shaped ring S, the two forming deflectors to protect
the orifice E in the lining D.
The hinged top A is preferably brought down to within a short distance of the glass
or lens T and door, and the perforated flange above the glass or lens connecting the
lining with the body of the lamp, which forms the passage between the hinged top A
and the lining D, is preferably inclined upwards and outwards.
I prefer to form flanges on the cover plate P and on the rim of the outer ring Q
which will approximately fit when they are brought in contact.
The cover plate P, the cup R, and ring S carried by the screw O may be raised
to leave more psssage for air through the opening E in the lining D in fine
weather, and be lowered to present less inlet for water should the weather be
stormy.
If a side lamp should be submerged in a heavy sea, or the rain enter the dome L of a
mast head light, the conical disc R and ring S carried at the bottom of the screw O

page_text: will deflect the water on to the lining D, from which it will run off, passing through
the perforated flange K; the raised edge F or flange around the orifice E of the
lining D further preventing any inflow of water to the interior of the lantern.
The lantern may be fitted with any suitable burner and reflector, and in the case of
mast-head lamps two burners may be used and double domes if desired.
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 :-
1. In lamps having a central orifice (E,) the use in combination with the same of
a conical disc (R) above a ring (S) and attached to a cover plate (P,) the whole
being supported and operated by a screw (0,) for the purposes and substantially as
described.
2. The chamber G formed between the lid A and the lining D, the perforated ring K,
and body C the lining D being flanged at F, the whole substantially as described for
the purposes specified.
3. Lamps constructed combined and arranged for the purposes and substantially as
described and illustrated in the accompanying drawing.
Dated this Eighteenth day of October 1888.
For the Applicant,
W. E. GEDGE,
Agent.