IMPROVEMENTS IN RAILWAY CARRIAGE LAMPS, ALSO APPLICABLE TO OTHER ANALOGOUS PURPOSES
Year: 1879

page_text: LETTERS PATENT to George Buit and Samuel Bruce Edmonds, both of
Birmingham, in the County of Warwick, for the Invention of "IMPROVEMENTS
IN RAILWAY CARRIAGE LAMPS, ALSO APPLICABLE TO OTHER ANALOGOUS
PURPOSES'
Sealed the 8th June 1880, and dated the 12th December 1879.
PROVISIONAL SPECIFICATION left by the said George Burt and Samuel
Bruce Edmonds at the Office of the Commissioners of Patents on the 12th
December 1879.
GEORGE BURT and SAMUEL BRUCE EDMONDS, both of Birmingham, in the County
of Warwick. "IMPROVEMENTS IN RAILWAY CARRIAGE LAMPS, ALSO APPLICABLE TO
OTHER ANALOGOUS PURPOSES."
This our Invention relates to the construction or arrangement of parts of lamps
for the burning of petroleum and other oils, being that class of lamp chiefly employed
in the roof of railway and other carriages.
The object of this our said Invention is to simplify the construction of such lamps
as may be applied to carriages and other purposes where a downward draught is
required to be obviated or diminished, and to secure a better ventilation.
In constructing our improvements as applied to railway lamps, we adopt the
ordinary body with flange, which finds its bearing upon the roof of the said
carriage when passed through the aperture for receiving the same. Above the flange
and around the periphery or other part suitable to our requirement, we arrange a
series of frames of any form, the interior of which shews perforated sections of the
body, while the exterior of the said frames carries suspended plates working freely
upon pins or joints by pressure of the external air or wind against the plates they
impinge against the perforated section of the body, and exclude the downward
draught, those not so compressed act as ventilators.
These we may designate as self acting valves, wind guards, and ventilators, and
can with facility be arranged to existing lamps.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said George Burt and Samuel Bruce Edmonds in the Great Seal Patent
Office on the 12th June 1880.
GEORGE BURT and SAMUEL BRUCE EDMONDS, both of Birmingham, in the County
of Warwick. "IMPROVEMENTS IN RAILWAY CARRIAGE LAMPS, ALSO APPLICABLE TO
OTHER ANALAGOUS PURPOSES."
This our Invention relates to the construction or arrangement of parts of lamps
for the burning of petroleum and other oils, being that class of lamp chiefly employed
in the roof of railway and other carriages.
The object of this our said Invention is to simplify the construction of such lamps
as may be applied to carriages and other purposes where a draught is required to
be obviated or diminished and to secure a better ventilation.
In constructing our improvements as applied to railway lamps, we adopt the
ordinary body with flange, which finds its bearing upon the roof of the said carriage
when passed through the aperture for receiving the same. Above the flange and
around the periphery or other part suitable to our requirement we arrange a series
of frames of any form, the interior of which shews perforated sections of the body,
while the exterior of the said frames carries suspended plates working freely upon
pins or joints by pressure of the external air or wind against the plates, they
impinge against the perforated sections of the body, and exclude the draught, those
not so compressed act as ventilators.
These we may designate as self-acting valves, wind guards, and ventilators, and
can with facility be arranged to existing lamps.
And in order that this our said Invention may be more clearly understood, we
will proceed to describe the same with reference to the annexed Drawings.
Fig. 1, on the accompanying Sheet of Drawings, is a view in elevation of a
railway carriage lamp with our Invention applied thereto; Fig. 2, a view of samo
partly sectional; Fig. 3, view in elevation of a lamp of globular form, chiefly
employed for piers, with our Invention applied thereto; Fig. 4, a view, front
elevation of our Invention, detached; Fig. 5, a plan view; Fig. 6, view in cross
section.
The same letters of reference indicate the same parts in the several Figures of the
.Drawing.
In Figs. 1 and 2, A is the body of the lamp; A¹, the flange or ring when
employed to its purpose, this finds its bearing upon the roof of the carriage and
secured in its position by means of the springs B; A² is the upper portion of
body connected or locked to A by the spring fastening C; D is the head of
lamp; D', the lid or cover for same, jointed or hinged and locked to D by the
spring fastening C¹; E, E, are tubular arms for carrying the oil reservoir F,
and the burner G and glass H; I are perforations, and act as ventilators.
In Fig. 3, A is the body of the lamp, composed of the body ring A¹, which
carries the framework A³, and into this the glass is fitted.
In Figs. 4, 5, 6, which illustrate our Invention detached, A is a frame with
cover for protection during the inclemency of the weather; c is a flap or door
suspended and working upon the pivots d. By reference to Fig. 1, where the
same is in application, it will be seen that the suspended doors chang vertically
until they receive pressure from the external air when they are forced or impinged
partially or wholly against A², if partially, the entry of the outer current of air
is diminished, if wholly, the perforations are secreted, and the entry of a draught
obviated, as illustrated by Fig. 2; upon the release of the pressure they regain
their normal position and serve as ventilators by means of the air passing through
the bottom or lower part of the frame a, which is entirely open and upwards
through the perforations I, thus preventing a cooling of the flame, and the

page_text: condensing of the products of combustion, increasing the light, and removing the
vitiated air from the compartment.
Having given a general description of our Invention and the manner in which
the same may be practically carried into effect, nevertheless, we wish to observe
that the mode that may be pursued according to the skill, taste, or appliances of the
artisan engaged in their production, the same may be varied without affecting the
character or principle of this our said Invention, as for instance, variation may be
pursued with the external form or device, the same may be produced by casting or
stamping, and the desired form obtained by tools specially provided, we purpose
the same being made in any metal or alloy or other suitable material.
What we claim as new and original and desire to be secured to us by the heroin-
before in part recited Letters Patent for "Improvements in Railway Carriage Lamps,
also Applicable to other Analagous Purposes," are,-
First. The construction and arrangement of the frame and cover with door or
flap suspended, and working upon pivots or their equivalent, substantially as and
for the purposes herein before set forth and described, or any mere modification.
Second. The application of the same to lamps for railway, street, ship, mines,
sewers, and other lamps communicating with the external air, or to such places
where the said lamps require a proper control for combustion and ventilation.
In witness whereof, we, the said George Burt and Samuel Bruce Edmonds,
have hereunto set our hands and seals, the Eleventh day of June, in the year
of our Lord One thousand eight hundred and eighty.
5 Witness,
THOMAS KENDRICK.
GEORGE BURT.
(L.S.)
SAMUEL BRUCE EDMONDS. (L,S.)