Improvements in Street and other Lamps.
Year: 1890

page_text: Date of Application, 18th Dec., 1890
Complete Specification Left, 18th Sept., 1891-Accepted, 24th Oct., 1891
PROVISIONAL SPECIFICATION.
Improvements in Street and other Lamps.
We CHARLES DARRAII of Miller Street, Manchester, Manufacturer and
ALEXANDER REYNARD of 50 Sherwood Street, Rochdale Road Manchester,
Lamp Maker, do hereby declare the nature of the said invention to be as
follows:
The object of our improvements is to construct a strect or other similar lamp
which shall be more perfectly ventilated than heretofore and yet shall not be
liable to flicker in gusty weather nor to be fractured by the glazing becoming
overheated.
In performing our invention we admit a part of the air current in the centre
of the lamp and immediately surrounding the gas pipe leading up to the burner
or burners and this is conveniently effected through a pair of inverted cones
constructed of perforated metal and forming together a double conical or truncated
chamber through which the air has to pass in entering the lamp and in doing
so is subdivided into a number of minute streams which have no appreciable
effect upon the illuminating flame.
This conical chamber rests in the central aperture of an annular sheet of
transparent glass-permitting the rays of light to pass downwards without
obstruction, the outer edges of which glass are supported upon an annular
chamber-constructed of two or more concentric sheets of perforated metal
rising from the bottom of the lamp; the centre of this annular chamber being
open to the atmosphere and thus constituting an additional sub-dividing chamber
for permitting currents of air to enter the lamp whilst the top of this chamber
surrounding the glass plate is bevilled off at a suitable angle to prevent its
casting a shadow and to ensure the currents playing upon the glazing of the lamp.
Dated this 17th day of December 1890.
JOHN G. WILSON,
Patent Office, 55, Market Street, Manchester, Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Street and other Lamps.
We, CHARLES DARRAH of Miller Street, Manchester, Manufacturer, and
ALEXANDER REYNARD, of 50 Sherwood Street, Rochdale Road, Manchester,
Lamp Maker, do hereby declare the nature of our said invention, and in what
manner the same is to be performed to be particularly described and ascertained in
and by the following statement:—
The object of our improvements is to construct a street or other similar lamp
which shall be more perfectly ventilated than heretofore and yet shall not be
liable to flicker in gusty weather nor to be fractured by the glazing becoming
overheated.
On the accompanying drawing Fig. 1 is an exterior view and Fig. 2 a
transverse sectional view of the lower portion of a street lamp with my
improvements shewn applied thereto.
In performing our invention we admit a part of the air current up the centre
of the lamp immediately surrounding the gas pipe leading to the burner or
burners which is conveniently effected by means of a pair of cones A. A. com-
posed of perforated metal forming together a double conical or truncated
chamber through which the air passes in entering the lamp, as indicated by the

page_text: arrows, and in so doing is subdivided into a number of minute streams which
have no perceptible effect upon the illuminating flame.
This conical chamber rests in the central aperture of an annular sheet of trans-
parent glass B, permitting the rays of light to pass downwards to light the space
beneath the lamp without obstruction-the outer. edges of which glass are supported
upon an annular chamber C constructed of two or more concentric sheets of
perforated metal resting on the bottom of the lamp as illustrated, the centre of..this
annular chamber being open to the atmosphere' and thus constituting an additional
subdividing chamber for permitting currents of air to enter the lamp.
-
In order to further subdivide the currents of air entering the lamp we affix a
division plate D between each cone as illustrated.
Having this particularly described and ascertained the nature of our inven-
tion and in what manner the same is to be performed we declare that what we
claim is―
1st The improvements in street or other lamps mounted and operating substan-
tially as hereinbefore described and illustrated on the accompanying drawing.
Dated this 17th day of September 1891.
JOHN G. WILSON,..
Agent for the Applicants...