Improvements in and connected with Electric Glow Lamps.
Year: 1889

page_text: Date of Application, 29th Apr., 1889
Complete Specification Left 3rd Jan. 1890-Accepted, 8th Feb., 1890
PROVISIONAL SPECIFICATION.
Improvements in and connected with Electric Glow Lamps.
I, ARTHUR WELLINGTON FITCH, of 10, Wilson Street, Finsbury, in the County of
London, Commission Merchant, do hereby declare the nature of this invention (a
communication from abroad by Richard Oliver Gardner Drummond, of Kimberley,
South Africa, Mining Engineer) to be as follows:-
This invention relates to electric glow lamps especially adapted for use in mines or
other damp situations.
One part of the said invention consists in the provision of a shield of porcelain or
other insulating material designed to prevent water from dripping onto the lamp and
serving at the same time as a reflector.
This shield is provided at its top with a wood-screw (preferably of galvanized iron)
by means of which it can be secured in any desired position, and on its underside
with a screw stud to which the lamp holder is screwed; the wood-screw and the stud
are however out of electrical connection.
The leading in wires must be thoroughly insulated and are permanently secured to
the filament.
COMPLETE SPECIFICATION.
Improvements in and connected with Electric Glow Lamps.
I, ARTHUR WELLINGTON FITOH, of 10, Wilson Street, Finsbury, in the county of
London, Commission Merchant, do hereby declare the nature of this invention (a
communication from abroad by Richard Oliver Gardner Drummond, of Kimberley,
South Africa, Mining Engineer) 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 electric glow lamps especially adapted for use in mines or
other damp situations, and consists chiefly in the provision of a shield of porcelain
or other insulating material designed to prevent water from dripping onto the lamp
and serving at the same time as a reflector and a lamp holder.
To enable my invention to be fully understood I will describe how it can be
carried into practice by reference to the accompanying drawings, in which—
Figure 1 is a sectional elevation of a lamp provided with a shield or reflector
according to my invention and adapted to be connected to a roof or ceiling.
Figure 2 is a similar view of a lamp and shield adapted for attachment to a wall;
and
Figure 3 is a front elevation of the same.
Figure 4 is a view of a lamp and reflector similar to that shown in figure 1, but
illustrating some modifications.
Similar letters of reference indicate corresponding parts in the several figures.
a is the lamp, b the filament thereof, c the head of the lamp, and d, d the leading
in wires which are preferably permanently secured to the filament b and e the
shield.
As shown in figure 1 the shield e is made circular and somewhat of a conical form
and is provided at the centre on its underside with a screw f to which the head c of
the lamp is connected, and at its upper side with a screw 9 (preferably of galvanized
iron to prevent it from rusting) by means of which the shield can be suspended in

page_text: any desired place. It will be seen that with this construction no drippings can fall
onto the lamp, and that the shield will also serve as a reflector.
In the arrangement shown in figures 2 and 3 the shield is somewhat in the form
of a spoon and extends downwards and partly around the lamp so as to reflect the
light in a horizontal direction. The screw 9 also (which as shown is secured to the
shield by a bolt g¹) is placed in a horizontal position so that it can be attached to
a wall.
In some cases the shield is adapted to carry the insulated conductors passing the
lamp and also if desired a cut-out or switch. This arrangement is shown in figure 4
where h, h indicate hooks for supporting the conductors or leads i, i, j a switch and k
a cut-out.
It is obvious that when a lamp shield or reflector of the kind hereinbefore described
is in use, any moisture deposited thereon or on the connections will be quickly
evaporated by the heat given off by the lamp whereby the insulation resistance is
made as perfect as possible thereby insuring economical working and minimising the
likelihood of a breakdown through leakage, in low resistance circuits.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. An insulated support or holder for glow lamps, so designed that it serves as a
reflector, substantially as described.
2. The manufacture and use of reflectors for glow lamps, substantially as herein-
before described and illustrated in the accompanying drawings.
T
2000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.