Improvements in and relating to Electrical Incandescence Lamps.
Year: 1899

page_text: Date of Application, 20th Mar., 1899-Accepted, 22nd Apr., 1899
[Communicated from abroad by ALLGEMEINE ELEKTRICITÄTS-GESELLSCHAFT,
Schiffbauerdamm, 22, Berlin, Germany.]
Improvements in and relating to Electrical Incandescence Lamps.
of
I, VICTOR ISIDORE FEENY, of 60, Queen Victoria Street, in the City and County
of London, Consulting Engineer and Chartered Patent Agent, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:.
This invention relates to improvements in electric lamps with illuminating
bodies composed of second class conductors (electrolytes).__
The object of this invention is an electric lamp composed of a base with an
incandescent body and lamp holder, the illuminating bodies or filaments being
made of what are termed second class conductors. The lamp is supplied with a
heating body or coil which is arranged near the illuminating body or filament
and serves for preliminary heating the same, in order that it may act so as to
conduct the current thereby becoming a conductor and affording illumination.
The current necessary for the heating of the heating or exciting body is auto-
matically interrupted after the illuminating body has become a fairly good con-
ductor of the current. Hence arises the necessity of there being at least three
pairs of contacts between the base and the lamp holder. The herein described
improvment consists in the fact that for lamps of the kind, sliding or sliding spring
contacts or the known principles or devices of the bayonet lamp holder, the
spring piston and bayonet-closure or catch are applied.
Figures 1 and 2 of the accompanying drawing illustrate two forms of such a
lamp.
The essential parts of the same are the lamp-holder and the lamp. The base a
is furnished with the spring contact rods or pins bc Fig. 1 and the contact
tube or socket d which latter serves at the same time for purposes of ventilation.
These contacts correspond respectively with the tubes or sockets fg seated in the
seating or base proper e of the lamp holder, and with the core i furnished with a
contact plate h, belonging to the solenoid k. The channels or passages 1 in the
seating or base piece e and the openings m in the casing allow of ventilation in the
direction of the arrows.
The current connections are as follows:-
The current enters at n and passes over the pair of contacts gc to the heating
body or coil o from thence over the contacts dh to the core and through the
solenoid casing to the conducting wire or lead g. When the illuminating body or
filament begins to act i.e. commences to glow the current runs simultaneously
through it over the contacts bf and through the winding of the solenoid to the
return wire q. The solenoid now becomes excited and the contact d h is broken.
In the form illustrated in Figure 2, the sheath or socket contacts bf and c g of
Fig. 1 are replaced by the device rs having a bayonet catch and the spring

page_text: piston with contact plates & suited to the same or corresponding therewith. The
current connections are the same as in Figure 1 and the lamp also acts in the
same manner.
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:
An electric lamp with illuminating bodies made of second class conductors, the
distinguishing feature of which is that of the three pairs of contacts between
the base and the lamp holder, two are formed as sliding or sliding-spring
contacts, spring piston contacts or bayonet catches for the purpose of securing
a simple and cheap connection between lamp and lamp holder, substantially as
described.
this 20th day of March 1899.
For the Applicant,
GEDGE & FEENY,
60, Queen Victoria Street, London, E.C.,
Chartered Patent Agents.