Improvements in Incandescent Electric Lamps.
Year: 1889

page_text: Date of Application, 8th June, 1889
Complete Specification Left, 4th Feb., 1890-Accepted, 8th Mar., 1890
PROVISIONAL SPECIFICATION.
Improvements in Incandescent Electric Lamps.
I ILLIUS AUGUSTUS TIMMIS of No. 2 Great George Street, Westminster London S.W.
Civil Engineer do hereby declare the nature of this invention to be as follows:-
The objects of my Invention are to make incandescent electric lamps so that the
same lamp may be used for two or more purposes-so that where now two lamps (or
more) have to be used one lamp may be used in future and thus not only one or more
lamps may be saved but the extra fittings may be saved. For instance in lighting
railway vehicles I may use a lamp of high candle power for the main lighting and
another of lower candle power for auxiliary lighting but by means of my invention
I can use one lamp and one set of fittings. Two lamps may be used for other
purposes for instance in theatres and in bedrooms or elsewhere and even three
lamps of different powers may be useful in one place and here my single lamp may
be used instead.
With these objects in view I construct incandescent electric lamps by any available
means and instead of putting one filament in I put two filaments in of different sizes
and any convenient form (I may put more than two if found advisable) which shall
give different candle power.
As an example I put one filament to give say 24 candle power to work with 110 volts.
and another of say 2 or 3 candle power to work with 8 volts.
The higher candle power filament being used for the main lighting and the lower
one for auxiliary lighting thus saving the use of two globes and the use of two
sets of lamp fittings. I may find it advisable to use two or more filaments of equal
power.
ΟΙ
Dated this 6th day of June 1009.
I. A. TIMMIS.
COMPLETE SPECIFICATION.
Improvements in Incandescent Electric Lamps.
I ILLIUS AUGUSTUS TIMMIS of No. 2 Great George Street, Westminster London S.W.
Civil Engineer, 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 :-
The objects of my Invention are to make incandescent Electric lamps so that the
same lamp may be used for two or more purposes-so that where now two lamps (or
more) have to be used one lamp may be used in future and thus not only one or
more lamps may be saved but the extra fittings may be saved. For instance in
lighting railway vehicles I may use a lamp of high candle power for the main
lighting and another of lower candle power for auxiliary lighting but by means of
my invention I can use one lamp and one set of fittings. Two lamps may be used for
other purposes for instance in theatres and in bedrooms or elsewhere and even
three lamps of different powers may be useful in one place and here my single
lamp may be used instead.
With these objects in view I construct incandescent electric lamps by any available
means and instead of putting one filament in I put two filaments in of different sizes
and any convenient form (I may put more than two if found advisable) which shall
give different candle power.
As an example I put one filament to give say 24 candle power to work with
110 volts. or say 16 to 20 candle power and 50 volts. and another of say 2 or 3 candle
power to work with 8 volts.

page_text: The higher candle power filament being used for the main lighting and the lower
one for auxiliary lighting thus saving the use of two globes and the use of two sets of
lamp fittings.
The annexed drawings together with the following description of them will enable
the Invention to be more clearly understood.
Fig. 1 represents a front view Fig. 2 a side view and Fig. 3 a cross section
(horizontally) of an Incandescent lamp showing the main or high voltage filament h
and the auxiliary or low voltage filament l. In fig. 1 the return wire of h is also used
for the same purpose for 1. Fig. 4 shows two complete circuits for h and l.
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 :-
The use of an electric incandescent lamp which has two or more filaments in it of
different candle power substantially as and for the purposes herein before described.
Dated this 4th day of February 1890.
I. A. TIMMIS.