Improvements in Gas Lamps commercially known as Sunlights.
Year: 1890

page_text: Date of Application, 8th July, 1890-Accepted, 23rd Aug., 1890
COMPLETE SPECIFICATION.
Improvements in Gas Lamps commercially known as Sunlights.
We ALEXANDER GILVIE BROWN and JAMES KIDD BROWN both of the firm of
Alexander Brown & Co. 94 Renfield Street Glasgow, in the County of Lanark, North
Britain Gas Engineers 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 :-
It has been the custom with some lamp manufacturers, to construct lamps or what
are commercially known as sunlights, so that the waste heat and gases, pass out from
the lamps directly into the building or wherever the lamps are used, which necessarily
vitiate the surrounding atmosphere and thereby prove a source of annoyance and
objection; or else they have been so constructed that waste products, pass in a straight
line through the centre of the lamp which is open from top to bottom.
Our invention which relates to such class of sunlights consists 1st. In conveying
away the smoke and other products of combustion through an annular opening
provided with perforations leading to the chimney and finally conducting the same
away, if may be, to some source of vent.
2nd. In giving a greater reflective surface which essentially increases the illuminating
power of the gas.
3rd. In providing a novel regulator for turning on and off the gas supply and
giving the requisite pressure.
Our improved sunlight is constructed as follows:-The tube by which the sunlight
is usually suspended from a ceiling supplies it with gas and passes through the centre
of the sunlight, and is screwed at one end to the regulator from which radial jets
are led.
The sunlight proper consists of a canopy or semi-outward casing, constructed in the
form somewhat of a parabolic curve, or rather, of the shape of a shallow bowl inverted;
and to the edges of which, bolted or otherwise secured is a broad flat ring slightly
conical buldged inward at an angle of about 25°.
This ring is peirced near to its smaller diameter with rows of perforations. Lying
immediately below at an angle of about 45° to the horozontal plane over one or more
of the said rows of perforations at a suitable distance apart for allowing the products
of combustion to pass up between, is the conical deflecting ring held in position by the
top edge of a hollow cone, or frustum of a cone, which has its smaller diameter pro-
jecting downwards supported at that point upon a shoulder formed on the upper
exterier of the regulator. This cone is rigidly fixed at the top to a bridge, the said
bridge is suspended at its centre upon the nut of a union coupling.
The exterior of the hollow cone and downward face of deflecting ring and the flat
ring, slightly conical, with the rows of perforations being enamelled, or otherwise
treated, or made of asbestos mixed with a suitable substance to give it adhesion,
present the reflective surface or surfaces to the sunlight.
An outward casing with numerous perforations of a more or less ornamental
character, acts as a source of ventilation, but which forms no part of our present
invention.
In order that our invention may be properly understood we have hereinto appended
an explanatory sheet of drawing, upon which the gas pipe is marked A joined by a
union coupling g, at a and a', 6 represents the gas regulator with its valve d screwed
against its seat by the crosshead f. Upon the valve rod of the valve d a four threaded
screw is cut and which when turned a quarter revolution by the said cross head, f,
allows the valve to move downwards from its seat to give a maximum gas pressure or
thereabonts to the sunlight.

page_text: -we have found from six to
care the radial jets of which any number may be used,-v
eight give very beneficial results.
B, is the sunlight body hereinbefore 'described.
C, the flat ring, slightly conical, with rows of perforations D. I represents the
annular opening through which the waste products are injected, arrows indicate the
direction which they take.
E, and F, are the deflecting ring and cone.
G, the bridge to which they are secured by bolts f". h is a clamping nut for
binding the bridge G, to the union coupling g, and H is the ornamental perforated
plate which performs the function of ventilation.
The special advantages derivable from our improvements are 1 that no currents of
cold air can pass up through the flame, which cause a flickering in other forms of
sunlights having an opening through and through 2 that the heat engendered round
the cone F by its close proximity to the flame, gives steadiness to the flame, and
deflects heat thereto, which increases the illuminating power of the gas and gives a
brilliant steady light.
Having now 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
1. The general arrangement and combination of parts constituting the sunlight
substantially as and for the purposes herein before described and shewn on the
accompanying drawing.
2. In gas lamps comnercially known as sunlights the employment of a hollow
inverted cone F and conical deflecting ring E so constructed as to completely close the
bottom central opening of the lamp substantially as and for the purposes hereinbefore
described and shewn on the accompanying drawing.
3. Constructing the said hollow inverted cone F conical deflecting ring E and the
flat ring slightly conical, either of enamelled metal or metal covered with asbestos, or
entirely composed of asbestos, or compounds of asbestos and clay or other refractory
heat resisting material substantially as and for the purposes hereinbefore described.
4. The employment of the flat ring C slightly conical, secured to the edge of the
bowl B having a buldge upwards wherein are provided a row or series of rows of
perforations so arranged that the products of combustion are drawn through near to
the edge of the said bowl. substantially as and for the purposes herein before described
and shewn on the accompanying drawing.
5. In combination with the said sunlight the gas regulator substantially as and for
the purposes herein before described and shewn on the accompanying drawing.
Dated this 7th day of July 1890.
ALEXANDER OGILVIE BROWN,
JAMES KIDD BROWN,
94, Renfield Street, Glasgow, Applicants.