Improvements in Lamps for Use in Photographic Dark Rooms and for other Uses.
Year: 1889

page_text: Date of Application, 15th Jan., 1889
Complete Specification Left, 27th May, 1889-Accepted, 29th June. 1889
PROVISIONAL SPECIFICATION.
Improvements in Lamps for Use in Photographic Dark Rooms and
for other Uses.
I FRANK HAES of 28
Middlesex, Gentleman, do
follows:-
Bassett Road, North Kensington, in the County of
hereby declare the nature of this invention to be as
The object of my invention is to obtain a more suitable aud convenient form of
lamp than that hitherto employed in photographic dark rooms and which is also
applicable to other uses, wherein a non-actinic and screened light is desirable and such
for example as dissolving view entertainments where the operator requires a light of
this description in order to select the slides or lectures when a lecturer requires a
reading lamp.
For this purpose
1 employ a candle lamp of that class known as a "reflecting
reading lamp" and preferably telescopic, that is to say, constructed in such manner
that the candle tube carrying the hood is capable of sliding up and down in a fixed
tube carried by the base of the lamp.
Instead of leaving the hood open at the front as heretofore I cover it with ruby or
other non-actinic glass which is mounted in a frame or cap fitting tightly upon the
rim of the hood and there removeably secured by means of hayonet fastenings or
catches or otherwise.
The rim of this cap or frame is formed with double walls leaving an annular space
all round between them closed at the front but open at the rear and the inner wall is
provided with a ring of perforations in order to admit the necessary supply of air to
the lamp to support combustion and the walls of the cap are at the rear of the per-
forations formed with shoulders one slightly overlapping the other in order to obstruct
any rays of light that might pass out through the perforations.
In order to carry off the products of combustion and at the same time efficiently
obstruct the passage of light the chimney is constructed with an enlargement or
chamber somewhat of the form of two cones meeting at their bases and within this
chamber is arranged an inverted cone notched or scalloped around the edge to
afford egress for the products of combustion and to enable it to be fixed in position.
By these means I obtain a convenient form of dark room or similar lamp
which may realily bo adjusted to any desired position and which in consequence of
the substitution of a candle for oil as the light giving medium is more cleanly is not
liable to have its contents spilled and generally is bettor adapted for such uses.
When a white light is required in the dark room the cap may be taken off or the
hood may be removed bodily leaving the naked candle flame.
COMPLETE SPECIFICATION.
Improvements in Lamps for Use in Photographic Dark Rooms and
for other Uses.
I FRANK HAES of 28 Bassett Road North Kensington in the County of Middlesex
Gentleman, 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 thereof that is to say :-
The object of my invention is to obtain a more suitable and convenient form of

page_text: of perforations in order to admit a supply of air through the chamber c* to the
flame of the candle and thus assist to keep the candle cone and candle cool at that
point.
Any rays of light that might pass out through the perforations are arrested by
the annular screen of the candle cone which is placed at such a distance from
the candle cone as will afford an efficient passage for the necessary supply of air to
the air chamber c*.
The front of the parabolic reflecting hood c is covered or enclosed by means of a
removeable frame or cap d in which a disc or screen of ruby or other non-actinic
glass is securely held by means of a projection d' and a screw d².
The cap or frame d fits tightly upon the front or rim of the hood c and is there
removeably secured by means of bayonet catches or fastenings or otherwise.
The rim of the cap or frame d is formed with double walls dd leaving an annular
space between them closed at the front but open at the rear and the inner wall d*
is provided with a ring of perforations & formed in an annular rib or projection de
of the wall in order to admit the necessary supply of air to the lamp to support
combustion and the rib or flange de also serves the purpose of a seat or stop for the
glass d* and obstructs the passage of light around the edge thereof to the front of
the lamp whilst the overlapping shoulders or angles of the walls d³ d' of the
cap d effectually prevent the passage of any rays of light that might otherwise pass
out through the perforations d' and between the walls d³ d towards the rear of the
lamp.
In the modified form of cap d represented at Figures 6 and 7 the overlapping
shoulder of the 'outer wall d' is dispensed with and the annular rib or projection de
is made slightly more pronounced in order to attain the desired end.
In order to carry off the products of combustion and at the same time efficiently
obstruct the passage of light the chimney is constructed with a removeable enlarge-
ment or chamber e at the top thereof such chamber being somewhat of the form of
two cones meeting at their bases where the two parts are easily separable in order to
enable the chamber e to be cleansed, and within this chamber e is loosely placed an
inverted cone or deflector el formed with notches or scallops e² around the edge thereof
to afford egress to the products of combustion and this cone is supported in position
by means of downwardly projecting legs which take a bearing upon the lower part
of the chamber e.
By these means I obtain a convenient form of dark room or similar lamp which
may readily be adjusted to any position and which in consequence of the substitution
of a candle for oil as the light-giving medium is more cleanly, is not liable to have
its contents spilled, and generally is better adapted for such uses.
d
When a white light is required in the dark room or elsewhere, the cap
may be
taken off or the hood a may be removed bodily leaving the naked flame of the
candle.
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. A candle lamp formed with a hood fitted with or adapted to receive a disc or
screen of non-actinic glass and provided with screened air inlets and a screened outlet
for the products of combustion substantially as herein shown and described and for
the purpose stated.
•
2. A candle lamp formed with a hood ca removeable cap d adapted to receive a
disc or screen of non-actinic glass d and provided with a screened way or ways to
conduct a supply of air to the interior of the lamp and a screened chimney or egress
for the products of combustion substantially as herein shewn and described and for
the purpose stated.
3. A candle lamp formed with a hood c, a removeable cap d adapted to receive a
disc or screen of non-actinic glass d* and provided with a rim consisting of double
wails dª dª formed with a shoulder or shoulders d d the inner wall d³ of which

page_text: terminates in a ring of perforations & forming a screened way or ways to conduct
a supply of air to the interior of the lamp, and a chimney consisting of a chamber e
formed of two cone shaped sections meeting at their bases and supporting an inverted
cone or deflector e provided with notches e around its edge and constituting a
screened outlet for the products of combustion, substantially as herein shewn and 5
described and for the purpose stated.
Dated this 25th dow of N. 1980
WHITE & WOODINGTON,
27, Southampton Buildings, Chancery Lane, London, Agents.