Ci Improvements in Incandescence Electric Lamps.
Year: 1885

page_text: 11. 9.
COMPLETE' SPECIFICATION.
つ
Y Ci
Improvements in Incandescence Electric Lamps.
I, FRANK WYNNE of 112 Belvedere Road Lambeth in the County of Surrey
Civil Engineer do hereby declare the nature of my invention for IMPROVEMENTS
IN INCANDESCENCE ELECTRIC LAMPS FOR BURNING UNDER WATER and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:—
My Invention relates to Improvements in incandescence electric lamps, for use
in places where difficulty is experienced in keeping the connections dry, clean and
free from any chemical or other destructive action, which tends to render the contact
more or less inefficient, such difficulty arising in a very large degree where these
lamps are placed under water, as is the case when they are used for lighting
powder magazines, the waterproof covering, hitherto employed, for preserving the
connections, having been found very unsatisfactory.
My Improvements consist in producing a form of "incandescence" lamp with
lengthened stem, and mechanical inside support to the metal wires; this lengthened
stem obviates the necessity of placing a waterproof covering over the connections,
these being placed beyond the reach of the water or other destructive agent and at
the same time offers a lamp which is not more liable than an ordinary lamp to be
broken by exposure to shocks.
In carrying out my Invention, I blow my lamp, glass, bulb with a long neck, the
length of the neck varying to suit the requirements of the case, the lamp bulb and
neck are made out of one piece of glass, and when blown into the desired shape,
I exhaust the air therefrom by means of a suitable pump: on the extreme end of
this lengthened neck I place the contacts, which are to be connected with the
source of electricity. In order to keep the metal wires, leading from the contact
points to the ends of the carbon filaments, from vibrating, which they will do
owing to their length, I place at the end of the neck, preferably farthest from the
contact points or at the incipient bulb of the lamp, a stay or distance piece
preferably of the form of a star, cross bar or disc of glass, which I attach to or
allow to touch or approximately touch the neck or incipient bulb, at one, but
preferably, at more points or, in the case of the disc, at its circumference.
It will now readily appear that as I can conveniently make this neck of
considerable length, I place my contact points at a point beyond the reach of the
water or other destructive agent and so produce a form of lamp, which overcomes
the difficulties herein before mentioned,

page_text: My Invention will be more readily understood on reference being made to the
sheet of drawings, accompanying and forming part of this Complete Specification.
Fig. i represents an elevation of my lamp, fully mounted.
"
Fig. ii
a convenient form of stay or distance piece which I usually
employ and which is preferably made of glass.
In Fig. i "a" is the glass bulb of the lamp & "b" the neck, of which it forms a
part; "c. c" are the contact points to which the leading wires, connected with the
source of electricity, are attached; "d d¹" are the platinum, or other suitable
metal, leads, which connect the ends of the carbon filament to the contacts "c. c',"
and "e" is the stay or distance piece, in which the metal leads "d. d¹” are
seated.
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
(i.) In an incandescence lamp a glass bulb with prolonged neck, the whole of
one piece of glass, encompassing a vacuum, in which the filament is placed,
substantially as & for the purpose described.
(ii.) In an incandescence lamp, the combination of a glass bulb and prolonged
neck, substantially as described, with a stay or distance piece, holding the metal
leads and preventing undue vibration; substantially as and for the purpose
described.